RESUMO
Patients who require restorative intervention in the anterior teeth expect esthetics to be integrated with other teeth that compose the smile. Therefore, not only should clinicians have a scientific technique for restoration of dental biology and function, but also their esthetic sense should direct them in the reproduction of polychromatic and anatomic characteristics of the tooth, rendering the restoration imperceptible. The introduction of new resin composites with better mechanical and optical properties, combined with better understanding of the optical behavior of dental tissues, has allowed a more artistic approach for accomplishment of direct bonded restorations with resin composite. Reproduction of optical behavior characteristics in restorations requires proper interpretation of shade variations, with use of resources and effects with resin composite to allow correspondence with the tooth substrates, and correct use of resin composite at the proper place and of exact thickness. This article describes, with the aid of a case report, a technique for shade selection and choice of resin composites. Moreover, a clinical sequence for application of resin composites is presented that allows reproduction of the interaction between tooth structures and light in proximoincisal restorations. With this technique, the restorative procedure achieves a satisfactory and predictable final esthetic outcome.
Assuntos
Resinas Acrílicas/uso terapêutico , Resinas Compostas/uso terapêutico , Restauração Dentária Permanente/métodos , Poliuretanos/uso terapêutico , Pigmentação em Prótese/métodos , Dente/anatomia & histologia , Adulto , Cor , Feminino , HumanosRESUMO
The purpose of this study was to evaluate the clinical performance of two "packable" posterior composites: Prodigy Condensable/Optibond Solo-Kerr (PC-OS) and Definite/Etch & Prime-Degussa (D-EP). Thirty-six patients participated in this study. A total of 78 restorations (40 with D-EP and 38 with PC-OS) were made. Each patient received at least two restorations (one of each studied material). The materials were handled according to the manufacturer's instructions. The occlusal adjustments were made at the placement visit. The restorations were finished and polished after 1 week. They were evaluated at baseline, and after 1 year and 2 years by two independent evaluators using the USPHS criteria. Colored slides were made of all the restorations. After 2 years, 34 patients and 74 restorations (38 with D-EP and 36 with PC-OS) were available for evaluation. A total of 50% of PC-OS restorations received A criterion and 50% received B criterion (2.8% color, 11.1% marginal staining, 27.8% superficial staining, 2.8% anatomic form and 5.6% marginal adaptation). For D-EP, 60.5% of restorations received A criterion and 39.5% received B criterion (2.6% color, 5.3% marginal staining, 10.5% superficial staining, 7.9% anatomic form and 13.2% marginal adaptation). The C criterion was observed only for marginal adaptation with D-EP (2 restorations-5.3%). The obtained data were tabulated and statistically analyzed using the Fisher, Chi-square and McNemar tests. After 2 years, PC-OS showed a significant increase in superficial and marginal staining. For D-EP the marginal adaptation and superficial staining became significantly worse than baseline.
Assuntos
Resinas Compostas/química , Restauração Dentária Permanente , Adulto , Bis-Fenol A-Glicidil Metacrilato/química , Distribuição de Qui-Quadrado , Cor , Preparo da Cavidade Dentária , Adaptação Marginal Dentária , Polimento Dentário , Restauração Dentária Permanente/métodos , Difosfatos/química , Etanol/química , Feminino , Seguimentos , Humanos , Masculino , Metacrilatos/química , Cimentos de Resina/química , Siloxanas/química , Propriedades de Superfície , Terpenos/químicaRESUMO
The purpose of this study was to evaluate the clinical performance of two "packable" posterior composites: Prodigy Condensable (P) (Kerr) and Definite (D) (Degussa). Thirty-six patients participated in the study. A total of 78 restorations were made, 40 with D and 38 with P. Each patient received at least two restorations, one of each studied material. The materials were handled according to the manufacturer's instructions. The restorations were finished and polished after 1 week. They were evaluated at baseline and after 1 year by two independent evaluators using the United States Public Health Service (USPHS) criteria. Colored slides were made of all the restorations. After 1 year, 35 patients and 76 restorations (39 with D and 37 with P) were available for evaluation. All restorations received A criteria except the following ones, which received B criteria: color P (one restoration) and D (one restoration), marginal staining P (three restorations) and D (two restorations), surface staining P (nine restorations) and D (three restorations), anatomic form P (one restoration) and D (three restorations), and marginal adaptation P (one restoration) and D (eight restorations). The obtained data were tabulated and statistically analyzed using the Fisher and McNemar tests. After 1 year, P showed a significant increase in superficial staining. For D, the marginal adaptation became significantly worse than baseline and P. The studied materials can be considered acceptable during this evaluation period. Further evaluations are necessary for a better clinical performance analysis.
Assuntos
Resinas Compostas , Restauração Dentária Permanente , Condicionamento Ácido do Dente , Bis-Fenol A-Glicidil Metacrilato/química , Hidróxido de Cálcio/química , Cor , Resinas Compostas/química , Preparo da Cavidade Dentária/classificação , Preparo da Cavidade Dentária/métodos , Adaptação Marginal Dentária , Polimento Dentário , Capeamento da Polpa Dentária , Adesivos Dentinários/química , Difosfatos/química , Etanol/química , Feminino , Seguimentos , Cimentos de Ionômeros de Vidro/química , Humanos , Masculino , Metacrilatos/química , Minerais/química , Cimentos de Resina/química , Siloxanas/química , Estatística como Assunto , Propriedades de Superfície , Terpenos/químicaRESUMO
PURPOSE: To determine the effect of cusp coverage with amalgam restorations on the fracture strength of weakened human maxillary premolars. MATERIALS AND METHODS: 30 extracted human maxillary premolars were divided into three groups; Group A (control): uncut teeth, Group B: wide MOD cavities prepared and the pulp chamber's roof removed. The teeth were restored with amalgam without cusp coverage, Group C: same as Group B plus cusp reduction and restored with amalgam. The teeth were included in metal rings with self-curing polystyrene resin and stored in water for 24 hrs. The restorations were refined with rubber points, polished and further stored in water for 24 hrs before being subjected to a compressive axial load in a Universal testing machine at 0.5 mm/min. RESULTS: The mean fracture strength obtained was: Group A: 173.3 Kgf, Group B: 47.3 Kgf and Group C: 127.7 Kgf. All values were statistically significantly different (P < 0.05). The amalgam restoration of weakened human premolars with cusp coverage amalgam significantly increased the fracture strength of the teeth (63%) as compared to teeth restored without cusp coverage. The results showed that cusp coverage with amalgam might be an option for restoring weakened endodontically-treated teeth.
Assuntos
Amálgama Dentário , Preparo da Cavidade Dentária/métodos , Fraturas dos Dentes/prevenção & controle , Análise de Variância , Dente Pré-Molar , Análise do Estresse Dentário , HumanosRESUMO
This study evaluated 30 gallium alloy (Gallium alloy GF) and 31 amalgam (Dispersalloy) restorations over a period of 8 months in both Class I and Class II cavity preparations in 28 human subjects. At baseline, all gallium alloy and amalgam restorations were considered acceptable (Alfa) in terms of caries, anatomic form, marginal adaptation, surface texture, and bulk fracture. Postoperative sensitivity was reported in 67% of the gallium alloy restorations and in 29% of the amalgam restorations. At 8 months, 61% of the gallium alloy restorations were rated Beta for marginal adaptation, and all restorations exhibited tarnish and corrosion. With a few exceptions, the amalgam restorations were rated Alfa for those criteria. Three gallium alloy restorations had to be replaced during the evaluation period because of severe postoperative sensitivity and 39% of gallium restorations still presented some sensitivity at 8 months. Additional problems exhibited by gallium restorations were tooth fractures, tooth cracks, and marginal whitening.
Assuntos
Ligas , Restauração Dentária Permanente/métodos , Gálio , Ligas/efeitos adversos , Ligas/química , Cor , Corrosão , Ligas Dentárias/efeitos adversos , Adaptação Marginal Dentária , Falha de Restauração Dentária , Desgaste de Restauração Dentária , Restauração Dentária Permanente/efeitos adversos , Sensibilidade da Dentina/etiologia , Seguimentos , Gálio/efeitos adversos , Gálio/química , Humanos , Fraturas dos Dentes/etiologia , Falha de TratamentoRESUMO
Aiming to evaluate placement and replacement of dental restorations, a questionnaire has been elaborated and distributed in Clinics of the Operative Dentistry Department, Bauru Dental Scholl--USP, for the students to point out some information about the operatory procedures performed. The analysis of the results made possible the observation that of the 241 restorations achieved, 45.64% were made due to primary caries and 54.36% were replacement of deficient restorations. The reasons for replacement as well as the possible factors responsible for failure of tooth-colored and amalgam restorations are analyzed and discussed.
Assuntos
Cárie Dentária/etiologia , Restauração Dentária Permanente/efeitos adversos , Resinas Compostas , Amálgama Dentário , Cárie Dentária/terapia , Infiltração Dentária , Cimentos de Ionômeros de Vidro , Humanos , Recidiva , Reoperação , Cimento de SilicatoRESUMO
This study is about the cast contraction of 10 alternative alloys developed in the Dentistics Department of the Faculdade de Odontologia de Bauru that were compared with type III and type IV gold alloys and alternative commercial alloys.