RESUMEN
BACKGROUND: Zygomatic implants are an alternative treatment in the rehabilitation of atrophic maxilla to promote stability in the stomatognathic system. The aim of this study was to compare the electromyographic (EMG) activity of masseter and temporalis muscles in controls and in individuals with complete implant-supported dentures anchored in the zygomatic bone. MATERIAL AND METHODS: Fifty-four volunteers of both genders (mean age 52.5 years) were selected and distributed into two groups: Individuals with zygomatic implant (ZIG; n=27) and fully dentate patients (CG; n=27). MyoSystem-BR1 was used to assess masseter and temporalis muscles EMG activity in different mandibular movements: protrusion, clenching, maximal voluntary contraction (MVC) with Parafilm M(R), right and left laterality and chewing (peanuts and raisins). Data was processed, normalized (MVC) and analyzed using the SPSS 21.0. Student t-test (P ≤ 0.05) was used for group comparison. RESULTS: The results were statistically significant (P ≤ 0.05) for protrusion, clenching, right and left laterality and raisin chewing. For the mandibular posture conditions, the ZIG obtained higher EMG activity patterns when compared to CG. For the masticatory performance during chewing of peanuts and raisins, the ZIG showed higher EMG mean values when compared to CG. CONCLUSIONS: The zygomatic implant promoted an active response of the muscle fibers (hyperactivity) during both mandibular posture and chewing conditions, probably due to the absence of periodontal receptors, which play a significant role for preparing a bolus for swallowing
Asunto(s)
Humanos , Músculos Masticadores/fisiología , Implantación Dental/estadística & datos numéricos , Electromiografía/métodos , Músculo Masetero/fisiología , Atrofia , Enfermedades Mandibulares/fisiopatologíaRESUMEN
A terapia Restauradora envolvendo Implantes Dentários, é reconhecida como um dos maiores avanços terapêuticos na Odontologia.São apresentadas diferentes abordagens empregando os implantes. Destaca-se a abordagem de Implantes Imediatos em Carga Imediata em Áreas de Molares.Indicações e Aspectos Técnicos de seu emprego são discutidos detalhadamente ,com o objetivo de apresentar esta abordagem terapeutica como uma opção segura e importante na manutenção da saúde dos pacientes (AU).
Restorative therapy with dental implants is considered one of the most important developments in Dentistry. Different approaches using dental implants were presented. Among them, the Immediate loading of implants in fresh extraction sockets in molar areas are especially relevant. Indications and technical aspects of this therapy are being discussed in details. The aim of this article is to present this therapy as an important and secure option to preserve patients' health (AU).
Asunto(s)
Proceso Alveolar/cirugía , Implantación Dental Endoósea , Carga Inmediata del Implante Dental , Diente Molar/cirugía , Brasil , Vías Clínicas/estadística & datos numéricos , Radiografía Dental/métodosRESUMEN
The purpose of this study was to present a protocol for the replacement of single teeth lost in the molar area with immediate implantation in fresh extraction sockets, no flap reflections or grafting procedures, and immediate loading. Twenty-three implants were placed in 20 patients between 2000 and 2006. No implants were lost and no signs of significant bone resorption, loss of osseointegration, or soft tissue complications were reported. The results of this study indicate that this protocol may be a feasible alternative for the replacement of condemned molars.
Asunto(s)
Implantación Dental Endoósea/métodos , Implantes Dentales de Diente Único , Prótesis Dental de Soporte Implantado , Alveolo Dental/cirugía , Adulto , Anciano , Coronas , Restauración Dental Provisional , Análisis del Estrés Dental , Femenino , Humanos , Masculino , Persona de Mediana Edad , Modelos Anatómicos , Diente Molar/cirugía , Factores de Tiempo , Extracción Dental , Torque , Adulto JovenRESUMEN
The objective of this study was to verify if differences in the design of internal hex (IH) and internal conical (IC) connection implant systems influence fracture resistance under oblique compressive forces. Twenty implant-abutment assemblies were utilized: 10 with IH connections and 10 with IC connections. Maximum deformation force for IC implants (90.58 +/- 6.72 kgf) was statistically higher than that for IH implants (83.73 +/- 4.94 kgf) (P = .0182). Fracture force for the IH implants was 79.86 +/- 4.77 kgf. None of the IC implants fractured. The friction-locking mechanics and the solid design of the IC abutments provided greater resistance to deformation and fracture under oblique compressive loading when compared to the IH abutments.