RESUMEN
La colocación de restauraciones directas a base de resina en el área de premolares y molares permite realizar tratamientos complejos en pacientes afectados por atrición dental severa y/o bruxismo. Hoy en día gracias a la técnica de grabado ácido, la fuerza de adhesión de la resina al esmalte disminuye la microfi ltración y sensibilidad postoperatoria. El objetivo de este artículo es describir la rehabilitación provisional mediante restauraciones adhesivas de resina compuesta en un paciente con atrición dental severa, el cual recibirá posteriormente tratamiento de ortodoncia por discrepancia de las arcadas. Al término de este tratamiento se colocarán restauraciones onlay de disilicato de litio (AU)
The placement of resin-based direct restorations in the area of premolars and molars allows the treatment of complex cases in patients aff ected by dental attrition and/or bruxism. Nowadays, due to the acid etching technique, the bond strength of the resin to the enamel will reduce the micro-leakage and post-operative sensitivity. The aim of this article is to describe the provisional rehabilitation with resin adhesive restorations, in a patient with a severe dental attrition, which will receive orthodontic treatment due to discrepancies in the arches. At the end of this treatment, ceramic restorations will be placed (AU)
Asunto(s)
Humanos , Masculino , Persona de Mediana Edad , Resinas Compuestas , Restauración Dental Provisional , Atrición Dental , Grabado Ácido Dental , Recubrimiento Dental Adhesivo , Pulido Dental , Incrustaciones , Compuestos de Litio , Bandas de Matriz , México , SilicatosRESUMEN
O objetivo deste estudo foi analisar a efetividade de polimerização, a adaptação marginal e interna de resinas compostas para dentes posteriores, empregando diferentes matrizes associadas ao envelhecimento artificial. Cento e vinte incisivos bovinos foram cortados e desgastados para simular dentes posteriores, nos quais foram realizados preparados de Classe II, com o ângulo cavo superficial gengival em dentina. As cavidades tinham 6 mm de altura (ocluso-cervical), 3 de largura(vestibulo-lingual) e 1,5 de profundidade (mesio-distal). Os espécimes foram divididos em seis grupos de acordo com o material restaurador utilizado: GrandioSO (Voco) convencional incremental, G-aenial universal flo (GC) fluída incremental, Xtrafil (Voco) convencional com inserção em bloco, X-tra base (Voco) fluída com inserção em bloco, Venus Bulk Fill (Kulzer) fluída com inserção em bloco e SureFil SDR (Dentsply) fluída com inserção em bloco. As resinas fluídas com inserção em bloco foram inseridas em incremento de 4 mm e receberam uma cobertura oclusal de 2 mm utilizando a resina GrandioSO, com exceção da X-tra fil que foi coberta com uma camada adicional do mesmo material. Nos demais grupos foi utilizada uma técnica incremental de 2 mm. Metade dos espécimes foi restaurada com matriz metálica e a outra metade com matriz de poliéster. O percentual de polimerização foi mensurado através da dureza Knoop e da relação dureza base/topo. A média da largura das fendas marginais presentes nas margens de cada restauração foi calculada após medição, em micrometros, no microscópio óptico (100x). Os espécimes foram submetidos à ciclagem mecânica (500,000 ciclos) e térmica (1,000 ciclos) e a fenda marginal foi avaliada novamente. Para fenda interna, os espécimes foram seccionados em uma cortadeira de precisão e o comprimento, em milímetros, da parede gengival que apresentava fenda foi mensurado no microscópio óptico. Foi calculada então a porcentagem de fenda em relação ao comprimento total ...
The aim of this study was to analyze the effectiveness of cure, marginal and internal adaptation of composite resins for posterior teeth using different matrices bands associated with artificial aging. One hundred and twenty bovine incisors were cut and flattened in order to simulate posterior teeth, and then were prepared for class II cavities with gingival cavosurface margin in dentin. Cavities had 6 mm height(occluso-cervical), 3 mm width (bucco-lingual) and 1.5 mm deep (mesio-distal).Specimens were divided into six groups according to the restorative material:GrandioSO (Voco)- conventional, G-aenial universal flo (GC)- flowable, X-tra fil (Voco)- conventional bulk, X-tra base (Voco)- flowable bulk, Venus Bulk Fill (Kulzer)- flowable bulk, and SureFil SDR (Dentsply)- flowable bulk. Bulk-fill composites were placed in single increment of 4mm and received a 2mm occlusal coverage of GrandioSO, with the exception of X-tra fil which was covered with a layer of the same material. The remmaing groups were restored in 2 mm incremental technique. Half ofthe specimens were restored with metallic and the other half with polyester matrix. of cure was measured by Knoop hardness and the bottom/tophardness ratio was evaluated. The average width of marginal gaps present in the restoration was calculated after optical microscope measuring (100x), in microns. The specimens were subjected to mechanical (500.000 cycles) and thermal cycling (1.000 cycles) and marginal gap was evaluated again. For internal adaptation, the specimens were sectioned and the gap length, in millimeters, present on the gingivalwall was measured in an optical microscope. The percentage of gap length in relation to the total length of the wall was also calculated. Data were analyzed with three andtwo-way ANOVA and Tukey´s test. Regarding effectiveness of cure, significant differences were observed for resin factor. Composites G-aenial universal flo (82.08%) and GrandioSO(84.62%) had the highest cure ...
Asunto(s)
Resinas Compuestas , Adaptación Marginal Dental , Bandas de Matriz , PolimerizacionRESUMEN
O objetivo deste estudo foi analisar a efetividade de polimerização, a adaptação marginal e interna de resinas compostas para dentes posteriores, empregando diferentes matrizes associadas ao envelhecimento artificial. Cento e vinte incisivos bovinos foram cortados e desgastados para simular dentes posteriores, nos quais foram realizados preparados de Classe II, com o ângulo cavo superficial gengival em dentina. As cavidades tinham 6 mm de altura (ocluso-cervical), 3 de largura(vestibulo-lingual) e 1,5 de profundidade (mesio-distal). Os espécimes foram divididos em seis grupos de acordo com o material restaurador utilizado: GrandioSO (Voco) convencional incremental, G-aenial universal flo (GC) fluída incremental, Xtrafil (Voco) convencional com inserção em bloco, X-tra base (Voco) fluída com inserção em bloco, Venus Bulk Fill (Kulzer) fluída com inserção em bloco e SureFil SDR (Dentsply) fluída com inserção em bloco. As resinas fluídas com inserção em bloco foram inseridas em incremento de 4 mm e receberam uma cobertura oclusal de 2 mm utilizando a resina GrandioSO, com exceção da X-tra fil que foi coberta com uma camada adicional do mesmo material. Nos demais grupos foi utilizada uma técnica incremental de 2 mm. Metade dos espécimes foi restaurada com matriz metálica e a outra metade com matriz de poliéster. O percentual de polimerização foi mensurado através da dureza Knoop e da relação dureza base/topo. A média da largura das fendas marginais presentes nas margens de cada restauração foi calculada após medição, em micrometros, no microscópio óptico (100x). Os espécimes foram submetidos à ciclagem mecânica (500,000 ciclos) e térmica (1,000 ciclos) e a fenda marginal foi avaliada novamente. Para fenda interna, os espécimes foram seccionados em uma cortadeira de precisão e o comprimento, em milímetros, da parede gengival que apresentava fenda foi mensurado no microscópio óptico. Foi calculada então a porcentagem de fenda em relação ao comprimento total...
The aim of this study was to analyze the effectiveness of cure, marginal and internal adaptation of composite resins for posterior teeth using different matrices bands associated with artificial aging. One hundred and twenty bovine incisors were cut and flattened in order to simulate posterior teeth, and then were prepared for class II cavities with gingival cavosurface margin in dentin. Cavities had 6 mm height(occluso-cervical), 3 mm width (bucco-lingual) and 1.5 mm deep (mesio-distal).Specimens were divided into six groups according to the restorative material:GrandioSO (Voco)- conventional, G-aenial universal flo (GC)- flowable, X-tra fil (Voco)- conventional bulk, X-tra base (Voco)- flowable bulk, Venus Bulk Fill (Kulzer)- flowable bulk, and SureFil SDR (Dentsply)- flowable bulk. Bulk-fill composites were placed in single increment of 4mm and received a 2mm occlusal coverage of GrandioSO, with the exception of X-tra fil which was covered with a layer of the same material. The remmaing groups were restored in 2 mm incremental technique. Half ofthe specimens were restored with metallic and the other half with polyester matrix. of cure was measured by Knoop hardness and the bottom/tophardness ratio was evaluated. The average width of marginal gaps present in the restoration was calculated after optical microscope measuring (100x), in microns. The specimens were subjected to mechanical (500.000 cycles) and thermal cycling (1.000 cycles) and marginal gap was evaluated again. For internal adaptation, the specimens were sectioned and the gap length, in millimeters, present on the gingivalwall was measured in an optical microscope. The percentage of gap length in relation to the total length of the wall was also calculated. Data were analyzed with three andtwo-way ANOVA and Tukey´s test. Regarding effectiveness of cure, significant differences were observed for resin factor. Composites G-aenial universal flo (82.08%) and GrandioSO(84.62%) had the highest cure...
Asunto(s)
Resinas Compuestas , Adaptación Marginal Dental , Bandas de Matriz , PolimerizacionRESUMEN
OBJECTIVE: The aim of this in vivo study was to radiographically evaluate the proximal contour of composite resin restorations performed using different matrix systems. MATERIALS AND METHODS: Patients with premolars needing class II type resin composite restorations involving the marginal ridge were selected. Thirty premolars were selected and randomly divided into three groups (n = 10 each) to receive restorations using different matrix systems: group 1: metal matrix coupled to a carrier matrix and wood wedge (G1-MMW); group 2: sectioned and precontoured metal matrix and elastic wedge (G2-SME); and group 3: a polyester strip and reflective wedge (G3-PMR). After the restorative procedure, bitewing radiographs were performed and analyzed by three calibrated professionals. The quality of the proximal contact and marginal adaptation of the proximal surfaces was classified as either correct or incorrect (undercontour/overcontour). RESULTS: The Pearson Chi-square statistical test (α = 5%) revealed a statistically difference between frequencies of correct and incorrect restorations (α(2) = 6.787, p < 0.05). The group G2 SME produced a higher frequency of correct proximal contours (90%), while G1-MMW and G3-PMR had a ratio of 40% correct and 60% incorrect contours respectively. CONCLUSION: None of the matrix systems was able to prevent the formation of incorrect proximal contours; however, the sectioned and precontoured metal matrix/elastic wedge configuration provided better results as compared to the other groups.
Asunto(s)
Diente Premolar/cirugía , Resinas Compuestas/química , Aleaciones Dentales/química , Materiales Dentales/química , Restauración Dental Permanente/clasificación , Bandas de Matriz/clasificación , Adulto , Diente Premolar/lesiones , Recubrimiento Dental Adhesivo , Preparación de la Cavidad Dental , Adaptación Marginal Dental , Restauración Dental Permanente/instrumentación , Femenino , Humanos , Masculino , Propiedades de SuperficieRESUMEN
A estratificação de resinas compostas por meio de métodos sofisticados pode ser facilitada pela técnica denominada Matriz Lingual, em que uma guia é confeccionada em elastômero, por meio da moldagem de uma superfície palatina, previamente encerada ou esculpida em um ensaio restaurador intraoral. Essa técnica apresenta muitas vantagens, facilitando a estratificação, a construção anatômica e as fases de acabamento e polimento. Porém, em algumas situações clínicas, o desenrolar das etapas para se obter essa matriz pode ser moroso ou até mesmo inviável. Visando a facilitar a obtenção de tal aparato, uma técnica foi idealizada para permitir significativa redução do tempo clínico. Tal matriz, denominada Matriz BRB, é amplamente discutida de maneira didática e clínica neste artigo, que apresenta suas vantagens em casos em que é imperativo o uso de guia para realização de uma estratificação controlada. A simplicidade dessa abordagem, bem como a redução do tempo clínico e de custos financeiros, a torna viável em clínica cotidiana
Advance layering composite resins can be facilitated by a technique called Lingual Matrix, where a guide is made of elastomer by molding a previously waxed tooth or sculpted in an intraoral test drive restoration. This technique has many advantages to sophisticated layering, facilitating stratification, anatomic construction and the stages of finishing and polishing. However, in some clinical situations, the unfolding of the steps to obtain this matrix can be time consuming or even infeasible. To facilitate the achievement of this apparatus, a technique was idealized allowing significant reduction in clinical time. This matrix, called the BRB Matrix is widely discussed in a didactic and clinical manner in this article, presenting its advantages in clinical cases where it is imperative to use guide for conducting a controlled layering. The simplicity of this approach, as well as reduced clinical time and financial costs turn it feasible in an everyday clinical practice
Asunto(s)
Humanos , Femenino , Adulto , Resinas Compuestas , Bandas de Matriz , Restauración Dental Permanente/métodosRESUMEN
Objetivo: O objetivo é relatar e observar resultado de reconstrução, em região cervical, pós-sequela de queimaduras há 18 anos. Relato do caso: Paciente do sexo masculino, 28 anos, com sequela de queimadura por cera aquecida, há 24 anos, resultando em retração cicatricial importante da região cervical, com repercussão sobre a face. O paciente foi internado para tratamento cirúrgico, sendo proposta ressecção completa da cicatriz, miotomia do platisma, enxerto de matriz dérmica em primeiro tempo e, em segundo tempo, enxerto de pele, de espessura de 0,2 mm em tiras. Discussão: A lesão por queimadura não é apenas uma urgência médica, mas desencadeia sérios problemas físicos, psicológicos e mesmo sociais para o paciente, sua família e sociedade. As crianças do sexo masculino e com idade entre 7 e 11 anos são as mais atingidas por queimaduras. Nessa faixa etária, as queimaduras parecem estar relacionadas a brincadeiras com álcool e outros materiais inflamáveis que, em nossa cultura, são mais comuns entre o sexo masculino. Estatísticas revelam que são realizados mais de 34 milhões de procedimentos cirúrgicos relacionados à lesão por queimadura. Na matriz de regeneração dérmica, a camada interna funciona como um scafold, promovendo o crescimento celular organizado e a síntese de colágeno de forma mais natural. É indicado em caso de feridas limpas e queimaduras de 2° grau profundo e 3° grau. As contraturas são elementos importantes ao analisar as sequelas de queimaduras. As queimaduras da região cervical também são de difícil condução cirúrgica, tanto para a realização do desbridamento quanto para a enxertia de pele, e devem ser realizadas na fase aguda dentro da primeira ou segunda semana após o trauma.
Objective: To describe and observe the result of reconstruction in the cervical region, post burn sequelae for over 18 years. Case report: Male patient, 28 years, burn sequelae wax heated for 24 years, resulting insignificant scar retraction of the cervical region, with repercussions on the face and hospitalized for surgical treatment. Proposed treatment with complete resection of the scar, platysma myotomy, dermal matrix graft for the first time and second time the skin graft, thick strips of 0.2 mm. Discussion: The burn injury is not just a medical emergency, but triggers serious physical, psychological and even social to the patient, family and society. The children were male and aged between 7 and 11 years were the most affected by burns. At this age, burns appear to be related to the games with alcohol and other flammable materials that in our culture, are more common among males. Statistics show that is performed more than 34 million surgical procedures related to burn injury. In the matrix of regenerating dermal layer acts as an internal scafold, organized to promote cell growth and collagen synthesis more natural. It is indicated in case of clean wounds and burns deep 2nd degree and 3rd degree. Contractures are an important element in analyzing the consequences of burns. The burning of the neck are also difficult to conduct surgical both for the realization of debridement and for skin grafting, and must be performed in the acute stage within the first or second week after the trauma.he trauma.
Asunto(s)
Humanos , Quemaduras , Bandas de Matriz , Trasplante de PielRESUMEN
This report presents an oblique crown fracture in the maxillary right premolars of an adolescent because of fall, which was treated using adhesive tooth fragment reattachment. The impact of the mandible base to the floor caused minor fractures in multiple teeth, severe fracture of teeth 14 and 15, and condylar fractures. The fragments of teeth 43, 45, 46, and 16 were lost at the site of accident. The condylar fractures were managed with a non-surgical conservative approach combining mandibular immobilization and stabilization of temporomandibular joints with maxillomandibular fixation using acrylic splints. After 3 months, the interocclusal splints were removed, and the patient was referred for dental care. Teeth 14 and 15 presented complicated oblique crown fractures causing separation of the buccal and palatal fragments, which were in place, attached to the gingival tissue. Tooth 15 presented chronic hyperplastic pulpits. The fragments were banded for stabilization during the endodontic treatment, and the bands served as matrix for adhesive tooth fragment reattachment. The other fractured teeth received direct composite resin restorations. After 8 years, tooth 16 developed pulp necrosis and was treated endodontically and restored with composite resin. Clinical and radiographic examination 19 years after trauma showed a good adaptation of the tooth fragment/composite resin restoration, good periodontal health, no signs of root resorption, and intact lamina dura.
Asunto(s)
Diente Premolar/lesiones , Recubrimiento Dental Adhesivo , Corona del Diente/lesiones , Fracturas de los Dientes/terapia , Adolescente , Resinas Compuestas/química , Esmalte Dental/lesiones , Materiales Dentales/química , Exposición de la Pulpa Dental/terapia , Restauración Dental Permanente/métodos , Dentina/lesiones , Femenino , Estudios de Seguimiento , Humanos , Hiperplasia , Técnicas de Fijación de Maxilares , Cóndilo Mandibular/lesiones , Fracturas Mandibulares/terapia , Bandas de Matriz , Maxilar , Diente Molar/lesiones , Índice Periodontal , Pulpitis/terapia , Tratamiento del Conducto RadicularRESUMEN
En los tratamientos restauradores modernos las obturaciones directas desempeñan un papel cada vez más importante. Incluso en restauraciones directas, se debe perseguir el objetivo de restituir la forma y la función deltejido duro dentario perdido. Además de diseñar bien la forma de la superficie oclusal, también es muy importante crear unos puntos de contactos fisiológicamente fuertes y morfológicamente correctos. El presente artículo describe un sistema diferentede matrices seccionales y anillos fijadores y sus aplicaciones, a partir de un caso clínico en una cavidad clase II.
Asunto(s)
Humanos , Masculino , Persona de Mediana Edad , Resinas Compuestas , Oclusión Dental , Restauración Dental Permanente , Bandas de Matriz , Preparación de la Cavidad DentalRESUMEN
This study evaluated the performance of composite restorations placed with two matrix and wedge systems 4 years after placement. In a split-mouth design, 23 patients were selected and received at least two class II restorations, one with metallic matrix and wooden wedge and the other with polyester matrix and reflective wedge. One dentist placed the 109 restorations, and all cavities were restored using Single Bond and P-60 (3M ESPE) according to the manufacturer's instructions. Polymerization was performed through occlusal (metallic matrices) or through the reflective wedge (polyester matrices). Restorations were evaluated and categorized as alpha (A), bravo (B), charlie (C), and delta (D; modified United States Public Health System criteria) at baseline and 4 years after placement. Both clinical aspects and interproximal radiographs were considered in the evaluation. Data were analyzed with Mann-Whitney and Friedman tests (α = 0.05). Fifteen subjects (78 teeth/102 proximal surfaces) were reassessed after 4 years. Considering comparisons within matrices in different evaluation time points, no significant differences were observed (p > 0.05). Comparing 4-year to baseline results, the quality of marginal adaptation (40% and 40.4 %, score A), marginal staining (31.3% and 28.8%, score A), and roughness (56% and 46.2%, score A) decreased for metallic and translucent matrices, respectively (p < 0.05), while color match (9.6%, score A), occlusal contacts (75%, score A), and proximal contacts (71.7%, score A) also decreased in quality for translucent matrices (p < 0.001). Although the matrix and wedge systems evaluated showed similar clinical performance, there was clinical quality loss after 4 years, with most of the restorations being still acceptable, and no intervention was necessary.
Asunto(s)
Resinas Compuestas , Restauración Dental Permanente/métodos , Bandas de Matriz , Adulto , Diente Premolar , Adaptación Marginal Dental , Restauración Dental Permanente/clasificación , Restauración Dental Permanente/instrumentación , Método Doble Ciego , Femenino , Estudios de Seguimiento , Humanos , Masculino , Metales , Diente Molar , Poliésteres , Estudios Prospectivos , Estadísticas no Paramétricas , Decoloración de Dientes , Resultado del TratamientoRESUMEN
Class V restorations are a very common occurrence in clinics. Some reasons include an increase in non-carious cervical lesions (NCCL), root caries and the elderly population. Unfortunately, Class V restorations also represent one of the less durable types of restorations and have a high index of loss of retention, marginal excess and secondary caries. Some causes for these problems include difficulties in isolation, insertion, contouring, finishing and polishing procedures. This technique demonstrates an alternative isolation and insertion method using photocured gingival barrier in association with a flowable resin and hybrid resin composite to recreate the gingival wall with minimum or no excess.
Asunto(s)
Resinas Compuestas/química , Materiales Dentales/química , Pulido Dental/métodos , Restauración Dental Permanente/métodos , Grabado Ácido Dental/métodos , Adulto , Preparación de la Cavidad Dental/clasificación , Preparación de la Cavidad Dental/instrumentación , Preparación de la Cavidad Dental/métodos , Esmalte Dental/patología , Profilaxis Dental/métodos , Restauración Dental Permanente/clasificación , Restauración Dental Permanente/instrumentación , Encía/patología , Humanos , Bandas de Matriz , Desgaste de los Dientes/terapiaRESUMEN
Los parámetros de estética dictados por la sociedad obligan a las personas a buscar cada vez más, armonía dentofacial. En consecuencia, se incrementó el número de tratamientos estéticos relacionados a cambios de forma, posición y color de los dientes. Una alteración estética de etiología múltiple, encontrada frecuentemente en la clínica odontológica, y que a menudo afecta la composición dentofacial, es el diastema anterior. La evolución...
Asunto(s)
Estética Dental , Diastema/etiología , Diastema/terapia , Restauración Dental Permanente , Recubrimiento Dental Adhesivo/instrumentación , Resinas Compuestas/química , Color , Atrición Dental/etiología , Preparación del Diente/métodos , Bandas de MatrizRESUMEN
Los parámetros de estética dictados por la sociedad obligan a las personas a buscar cada vez más, armonía dentofacial. En consecuencia, se incrementó el número de tratamientos estéticos relacionados a cambios de forma, posición y color de los dientes. Una alteración estética de etiología múltiple, encontrada frecuentemente en la clínica odontológica, y que a menudo afecta la composición dentofacial, es el diastema anterior. La evolución...
Asunto(s)
Diastema/etiología , Diastema/terapia , Estética Dental , Restauración Dental Permanente/métodos , Atrición Dental/etiología , Color , Bandas de Matriz , Preparación del Diente/métodos , Recubrimiento Dental Adhesivo/instrumentación , Resinas Compuestas/químicaRESUMEN
This study sought to evaluate how the matrix and insertion technique affected microleakage and microhardness of posterior composite restorations. Class II preparations with the gingival margin in cementum were performed in 60 bovine teeth and divided into two groups: transparent matrix and reflective wedge (Group T) (n=20) and metallic matrix and wood wedge (Group M) (n=40). Cavities were restored and specimens were isolated with nail varnish, immersed in 0.2% Rhodamine B, and sectioned. Microleakage was evaluated under magnification (20x) and data were analyzed with one-way ANOVA. Microhardness was assessed at 1, 2, and 3 mm from the gingival wall and data were analyzed with two-way ANOVA. No significant difference was observed in terms of leakage. Significant differences were observed in terms of hardness for both factors, although no interaction was noted. It was concluded that the insertion technique had no influence on microleakage and that using a metallic matrix with oblique increments provided the highest hardness. There was no correlation between these two variables.
Asunto(s)
Resinas Compuestas/química , Filtración Dental/clasificación , Materiales Dentales/química , Restauración Dental Permanente/métodos , Bandas de Matriz , Grabado Ácido Dental/métodos , Animales , Bovinos , Preparación de la Cavidad Dental/clasificación , Cemento Dental/patología , Restauración Dental Permanente/instrumentación , Diseño de Equipo , Colorantes Fluorescentes , Dureza , Ácidos Polimetacrílicos/química , Distribución Aleatoria , Cementos de Resina/química , Rodaminas , Propiedades de Superficie , Temperatura , Factores de Tiempo , Agua/químicaRESUMEN
OBJECTIVES: This in vitro study evaluated the fracture resistance of weakened human premolars (MOD cavity preparation and pulp chamber roof removal) restored with condensable resin composite with and without cusp coverage. MATERIAL AND METHODS: Thirty human maxillary premolars were divided into three groups: Group A (control), sound teeth; Group B, wide MOD cavities prepared and the pulp chamber roof removed and restored with resin composite without cusp coverage; Group C, same as Group B with 2.0 mm of buccal and palatal cusps reduced and restored with the same resin. The teeth were included in metal rings with self-curing acrylic resin, stored in water for 24 h and thereafter subjected to a compressive axial load in a universal testing machine at 0.5 mm/min. RESULTS: The mean fracture resistance values ± standart deviation (kgf) were: group A: 151.40 ± 55.32, group B: 60.54 ± 12.61, group C: 141.90 ± 30.82. Statistically significant differences were found only between Group B and the other groups (p<0.05). The condensable resin restoration of weakened human premolars with cusp coverage significantly increased the fracture resistance of the teeth as compared to teeth restored without cusp coverage. CONCLUSION: The results showed that cusp coverage with condensable resin might be a safe option for restoring weakened endodontically treated teeth.
Asunto(s)
Humanos , Resinas Compuestas , Restauración Dental Permanente/métodos , Diente no Vital , Fracturas de los Dientes/prevención & control , Fuerza Compresiva , Resinas Compuestas/química , Preparación de la Cavidad Dental , Análisis del Estrés Dental , Bandas de Matriz , Corona del Diente/lesionesRESUMEN
OBJECTIVES: This in vitro study evaluated the fracture resistance of weakened human premolars (MOD cavity preparation and pulp chamber roof removal) restored with condensable resin composite with and without cusp coverage. MATERIAL AND METHODS: Thirty human maxillary premolars were divided into three groups: Group A (control), sound teeth; Group B, wide MOD cavities prepared and the pulp chamber roof removed and restored with resin composite without cusp coverage; Group C, same as Group B with 2.0 mm of buccal and palatal cusps reduced and restored with the same resin. The teeth were included in metal rings with self-curing acrylic resin, stored in water for 24 h and thereafter subjected to a compressive axial load in a universal testing machine at 0.5 mm/min. RESULTS: The mean fracture resistance values +/- standard deviation (kgf) were: group A: 151.40 +/- 55.32, group B: 60.54 +/- 12.61, group C: 141.90 +/- 30.82. Statistically significant differences were found only between Group B and the other groups (p<0.05). The condensable resin restoration of weakened human premolars with cusp coverage significantly increased the fracture resistance of the teeth as compared to teeth restored without cusp coverage. CONCLUSION: The results showed that cusp coverage with condensable resin might be a safe option for restoring weakened endodontically treated teeth.
Asunto(s)
Resinas Compuestas , Restauración Dental Permanente/métodos , Fracturas de los Dientes/prevención & control , Diente no Vital , Resinas Compuestas/química , Fuerza Compresiva , Preparación de la Cavidad Dental , Análisis del Estrés Dental , Humanos , Bandas de Matriz , Corona del Diente/lesionesRESUMEN
This incidence of postoperative sensitivity was evaluated in resin-based posterior restorations. Two hundred and ninety-two direct restorations were evaluated in premolars and molars. A total of 143 Class I and 149 Class II restorations (MO/OD and MOD) were placed in patients ranging in age from 30 to 50 years. After the cavity preparations were completed, a rubber dam was placed, and the preparations were restored using a total-etch system (Prime & Bond NT) and a resin-based restorative material (TPH Spectrum). The patients were contacted after 24 hours and 7, 30 and 90 days postoperatively and questioned regarding the presence of sensitivity and the stimuli that triggered that sensitivity. The Chi-square and Fisher's Exact Test were used for statistical analysis. Evaluation at 24 hours after restorative treatment revealed statistically significant differences among the types of cavity preparations restored and the occurrence of postoperative sensitivity (p = 0.0003), with a higher frequency of sensitivity in Class II MOD restorations (26%), followed by Class II MO/DO (15%) and Class I restorations (5%). At 7, 30 and 90 days after restorative treatment, there was a decrease in the occurrence of sensitivity for all groups. The percentage of sensitivity among the groups was not significantly different. This study shows that the occurrence of sensitivity is correlated with the complexity of the restoration.
Asunto(s)
Diente Premolar , Resinas Compuestas , Restauración Dental Permanente/clasificación , Sensibilidad de la Dentina/etiología , Diente Molar , Grabado Ácido Dental , Adulto , Frío , Resinas Compuestas/química , Recubrimiento de la Cavidad Dental , Preparación de la Cavidad Dental/efectos adversos , Preparación de la Cavidad Dental/clasificación , Restauración Dental Permanente/efectos adversos , Recubrimientos Dentinarios/química , Estudios de Seguimiento , Calor , Humanos , Masticación , Bandas de Matriz , Persona de Mediana Edad , Ajuste Oclusal , Ácidos Polimetacrílicos/química , Dique de GomaRESUMEN
PURPOSE: To evaluate the clinical performance of composite restorations performed with two matrix and wedge systems. METHODS: Each of 23 subjects received at least one pair of Class II restorations, one with metallic matrix and wooden wedge and the other with polyester matrix and reflexive wedge. One dentist placed 109 Class II restorations, 51 in premolars and 58 in molars, all in occlusion. Most of the cavities were surrounded by enamel. The restorations were evaluated at baseline, and after 12 months using the modified USPHS criteria. All cavities were restored using Single Bond and P-60, according to the manufacturer's indications. In the metal matrix group, polymerization was performed from occlusal, and in the polyester group, through the reflexive wedge. Statistical analysis was carried out with Chi-square and McNeumar tests. RESULTS: After 12 months, there was a significant increase in marginal staining, and marginal adaptation was affected by clinical service. There were no differences between matrix and wedge systems, neither considering dental groups nor cavity types.
Asunto(s)
Resinas Compuestas/química , Aleaciones Dentales/química , Materiales Dentales/química , Restauración Dental Permanente/clasificación , Bandas de Matriz , Poliésteres/química , Grabado Ácido Dental , Adolescente , Adulto , Bisfenol A Glicidil Metacrilato/química , Color , Adaptación Marginal Dental , Restauración Dental Permanente/instrumentación , Restauración Dental Permanente/métodos , Diseño de Equipo , Femenino , Estudios de Seguimiento , Humanos , Masculino , Ensayo de Materiales , Persona de Mediana Edad , Factores de Tiempo , MaderaRESUMEN
OBJECTIVE: The aim of this randomized, clinical study was to evaluate the performance of composite restorations placed with two matrix and wedge systems after a 2-year follow-up. METHODS: Twenty-three patients were selected, and received at least two Class II restorations, one with metallic matrix and wooden wedge and other with polyester matrix and reflective wedge. One dentist placed all the 109 restorations. All cavities were restored using Single Bond and P-60 (3M ESPE), according to manufacturer's instructions. In the metal matrix group, polymerization was performed from occlusal, and in the polyester group, through the reflective wedge. Restorations were evaluated at baseline and after 12 and 24 months by the modified USPHS criteria, and data were analyzed with Mann-Whitney and Wilcoxon Signed Rank tests (alpha=0.05). RESULTS: Fifteen subjects and 78 restorations were re-evaluated after 24 months. A significant decrease in the quality of cervical adaptation and proximal contacts by radiographic evaluation was evidenced (p<0.05), but no differences between the two matrix systems were detected (p>0.05). In the clinical evaluation there were no significant differences between matrices after 2 years (p>0.05). A compromising of marginal adaptation, marginal staining and proximal contacts aspects for both matrix systems was evidenced, and restorations placed with translucent matrices showed loss of color stability (p<0.05). CONCLUSIONS: Whereas restorations presented some clinical aspects somewhat compromised after 2 years, the matrix and wedge systems evaluated showed similar clinical performance.
Asunto(s)
Resinas Compuestas , Materiales Dentales , Restauración Dental Permanente/clasificación , Bandas de Matriz/clasificación , Adolescente , Adulto , Bisfenol A Glicidil Metacrilato/química , Color , Resinas Compuestas/química , Aleaciones Dentales/química , Preparación de la Cavidad Dental/clasificación , Adaptación Marginal Dental , Materiales Dentales/química , Restauración Dental Permanente/instrumentación , Recubrimientos Dentinarios/química , Método Doble Ciego , Estudios de Seguimiento , Humanos , Persona de Mediana Edad , Poliésteres/química , Polímeros/química , Estudios Prospectivos , Propiedades de Superficie , Madera/químicaRESUMEN
PURPOSE: To investigate in vivo and in vitro Class II composite restorations performed with two matrix and wedge systems. MATERIALS AND METHODS: One hundred nine Class II restorations were performed in 23 patients, 59 with metallic matrices and wooden wedges (group 1) and 50 with polyester matrices and reflective wedges (group 2). All cavities were restored using Single Bond and P-60 (3M ESPE). In the metal matrix group, polymerization was performed from the occlusal, and in the polyester group through the reflective wedge. To assess microleakage, 40 proximal standard slot cavities were prepared in 20 noncarious human third molars. In the mesial cavity, the gingival margin was located at the enamel level, and in the distal cavity at the cementum/dentin. Specimens were randomly divided into two groups (n = 20) and restored with Single Bond, Z-250 (3M ESPE), and the same techniques used in the in vivo study: metal matrix/wooden wedge (group 1) and polyester matrix/reflective wedge (group 2). Specimens were thermocycled (500 times, 5 degrees C to 55 degrees C), then isolated with nail varnish and immersed in fuchsin for 8 h. Specimens were sectioned longitudinally and microleakage was assessed under magnification (40X) using a standard scoring system. RESULTS: Data were subjected to the chi-square test, Mann-Whitney U-test, and Kruskal-Wallis H-test. Matrix systems presented similar results in the clinical evaluation and the in vitro microleakage test of Class II composite restorations. Dye leakage was minimal at enamel margins, and statistically lower (p < 0.05) than at cementum/dentin margins. CONCLUSION: The different matrix systems had no influence on clinical performance or in vitro sealing ability of Class II composite restorations.
Asunto(s)
Resinas Compuestas/química , Recubrimiento Dental Adhesivo , Materiales Dentales/química , Restauración Dental Permanente/clasificación , Bandas de Matriz/clasificación , Adolescente , Adulto , Bisfenol A Glicidil Metacrilato/química , Color , Aleaciones Dentales , Preparación de la Cavidad Dental/instrumentación , Cemento Dental/patología , Esmalte Dental/patología , Filtración Dental/clasificación , Adaptación Marginal Dental , Restauración Dental Permanente/instrumentación , Dentina/patología , Femenino , Humanos , Masculino , Ensayo de Materiales , Persona de Mediana Edad , Poliésteres , Propiedades de Superficie , MaderaRESUMEN
UNLABELLED: Reproducing the form, function, and optical characteristics of natural dental structures with direct composites in large and moderately large proximoincisal (Class IV) restorations represents a great challenge for clinicians in general. Understanding color is fundamental to achieving success when restoring these defects, as was discussed in Part I of this two-part article (Volume, 16, Number 6). The proper restoration of the functional lingual contour is also a challenge that cannot be overcome without close attention to the restorative technique. In this second article, the composite application technique is discussed and presented in detail. Clinical photographs illustrate the proposed technique. CLINICAL SIGNIFICANCE: The proposed clinical protocol, including a try-in of the shades in a mock-up restoration to more accurately define color and shape, and a silicone guide to transfer the lingual and proximoincisal contour of the mock-up to the final restoration, is of great help to successfully restore proximoincisal defects.