ABSTRACT
PURPOSE: To evaluate an experimental multistepped drill for single-stage implant site preparation by means of real-time analysis of thermal variations during and postdrilling, and by implant stability evaluation. MATERIALS AND METHODS: Temperature and time were recorded in real time by paired microprobe thermocouples during simulated osteotomy in type 2 bone similes at the cortical and cancellous zones. Three different drilling groups with a new multistepped drill design were compared: Control (2-mm diameter pilot drill + 3.3-mm three-stepped drill + 4.1-mm three-stepped drill); Test A (3.3-mm three-stepped drill); and Test B (4.1-mm three-stepped drill). Implants were inserted, and implant stability was evaluated with the Perio Test Value (PTV). Two-way anova was used to test the independent effects of osteotomy and implant diameter on temperature and stability. RESULTS: All the drills induced thermal changes without significant differences between groups (p > .05). Drilling in cortical bone produced significant increase of the temperatures in a range of 1.8 ± 0.9°C compared with drilling in cancellous bone (p < .05). ΔT temperatures were significantly higher for test groups in cortical and cancellous bone (p < .05); ΔT10 for all groups showed a reduction of the temperature in a range of 1.7 ± 0.3°C without significant differences between groups (p > .05); the mean time to accomplish drilling was significantly longer in the control group (p < .05); test groups took 10 ± 0.3 seconds less to reach the required drilling depth. PTV values were higher in test groups compared with controls (p < .05). CONCLUSIONS: The multistepped drills used for single-stage implant site preparation Increase temperature as in comparison with a conventional incremental protocol; Induce the temperature increment in cortical bone compared with the cancellous bone; Reduce drilling time when a multistepped drill is used alone; and Increase implant stability twofold compared with a conventional incremental protocol.
Subject(s)
Dental Implantation, Endosseous/methods , Dental Instruments , Humans , TemperatureABSTRACT
Introducción: Los materiales de uso odon - tológico son sometidos a diferentes pruebas para determinar su compatibilidad, bioac - tividad, y demostrar que son aptos para permanecer en el medio oral sin producir una respuesta adversa. Con tal propósito ac - tualmente en el mundo se emplean distintas técnicas como los cultivos celulares, técni - cas de biología molecular hasta el empleo de larvas de camarón (brineshrimplarvae) mejor conocidas como Artemia salina. Objetivo: Caracterizar cinco materiales odontológicos, utilizando la prueba de citotoxicidad con larvas de camarón Ar - temia salina. Materiales y métodos: Se realizó prueba de citotoxicidad de unas muestras de Titanio IV, Silicona Pesada, Acrílico de Auto-cu- rado, Resina de foto-curado y Eugenolato, utilizando el método de Artemia salina. Resultados: El ensayo de citotoxicidad con Artemia salinamostróque para la viabilidad de las larvas el eugenolato es 100 % toxico - ya que eliminó todas las larvas, y los otros productos mostraron biocompatibilidad en los siguientes porcentajes: titanio tipo IV 100%, silicona 46%, acrílico 62% y resina 72%. Conclusión: El método de la Artemia salina es sencillo y económico para realizar estu- dios de citotoxicidad, no requiere mayor tecnología en infraestructura, y combinado con otras técnicas de biología celular puede convertirse en un método tan específico como se desee. El titanio tipo IV mostró 0% y el eugenolato 100%de citotoxicidad para viabilidad de las larvas de Artemia Salin
Background: The dental materials are subjected to various tests for consistency, bioactivity, and demonstrate that they can remain in the oral environment without producing an adverse response. Currently for this purpose worldwide are employed different techniques such as cell culture, techniques of molecular biology and the use of shrimp larvae (brineshrimplarvae) better known as Artemia salina. Objective: Characterize five dental mate - rials using a cytotoxicity test with larval shrimp Artemia salina. Materials and methods: A cytotoxicity study was performed on samples of Tita - nium Type IV, Silicone Heavy, Auto-cured acrylic resin and photo-curing and Euge- nolatousing the method of Artemia salina. Results: The cytotoxicity assay for Artemia Salina showed no viability foreugenolato because all the larvaes were eliminated, and other products showed biocompatibility in the following percentages. Titanium type IV 100%, the silicone 46%, acrylic 62% and resin 72%. Conclusions: The method of brine shrimp is a simple and economical method for studies of cytotoxicity, requires greater infrastructure technology, and combined with other techniques of cell biology can become as specific method as desired. The - re is viability for the artemiasalina larvae with type IV titanium of 100% and with eugenolato of 0%
Subject(s)
Cytotoxicity Tests, Immunologic , Dental Materials , Dentistry , Materials Testing , Oral Medicine , Bone and Bones , Materials Testing , Methods , Periodontics , PeriodontiumABSTRACT
Objetivo: El objetivo de este estudio es identificar los cambios craneofaciales pro - ducto del uso a largo plazo de Dispositivos de Avance Mandibular (DAM) durante el tratamiento de la Apnea Obstructiva del Sueño (AOS) por medio de una revisión sistemática de la literatura. Materiales y métodos: Se realizó una revi- sión sistemática de la literatura en las bases de datos electrónicas PubMed, EBSCO - host, The Cochrane Library y EMBASE, limitada al rango Enero 2000 - Mayo 2014, estudios en humanos y en idioma ingles. Se aplicaron criterios de inclusión y exclusión y los artículos seleccionados fueron someti - dos a una evaluación critica por medio de la lista de chequeo internacional CONSORT. Posteriormente se realizo una clasificación del nivel de evidencia y el grado de reco- mendación con base en la estrategia SORT. Resultados: Se identifican 1383 artículos en el rango establecido. Después de aplicar los criterios de inclusión y de completar la lista de chequeo adecuada solo 1 articulo cumplió todos los requerimientos para su selección y posterior evaluación bajo la estrategia SORT. Conclusiones: No se encuentra eviden - cia suficiente que permita identificar los cambios craneofaciales producto del uso de dispositivos de avance mandibular en el tratamiento de la apnea obstructiva del sueño a largo plazo.
Objective: The aim of this study is to iden- tify the craniofacial changes of long term use of Mandibular Advancement Devices (MAD) for Obstructive Sleep Apnea (OSA) treatment trough a systematic review of the literature. Materials and methods: A systematic review was performed assessing the fo - llowing electronic databases: PubMed, EBSCOhost, The Cochrane Library and EMBASE, between January 2000 and May 2014, human studies and english language. Inclusion and exclusion crite - ria were applied to the results. Selected articles were evaluated with the use of an international check list related to the type of the study (CONSORT). A classification of the level of evidence and the degree of recommendation were performed trough the SORT strategy. Results: 1383 articles were identified after the initial search. After applying the criteria selection and complete the check list selec - ted (CONSORT) only 1 study fulfilled the inclusion criteria. A classification of the level of evidence and grade of recommen - dation were performed by using the SORT strategy to the selected article. Conclusions: No enough body of evidence were found in this study to identify the craniofacial changes with the long term use of Mandibular Advancement Devices for the treatment of Obstructive Sleep Apnea.
