ABSTRACT
STATEMENT OF PROBLEM: Although cement-retained implant prostheses are widely used, the quantification of optimal retention remains controversial, and new dental luting agents should be evaluated. PURPOSE: The purpose of this study was to compare, in vitro, the casting retention on implant abutments after cementation with 3 commercially available luting agents and an experimental luting agent (castor oil polyurethane, COP) with variable weight percentages (wt%) of calcium carbonate (CaCO3). MATERIAL AND METHODS: Seventy-two palladium-silver cast copings were fabricated and divided into 6 groups: Temp Bond interim cement (TB); zinc phosphate cement (ZP); Rely X ARC resin cement (RX); pure COP (COP); COP + 10% wt% CaCO3 filler (COP 10); and COP + 50% wt% CaCO3 filler (COP 50). After cementation, the specimens were stored in distilled water at 37°C for 24 hours and subjected to removal force tests in a universal testing machine (5 kN; 0.5 mm/min). Statistical analyses were performed with the Kruskal-Wallis and Student-Newman-Keuls tests (α=.05). RESULTS: The median values of casting retention (N) were as follows: TB=57.20 ±10.4; ZP=343.56 ±50.3; RX=40.07 ±9.7; COP=258.98 ±41.4; COP 10=466.57 ±79.3; and COP 50=209.63 ±31.4. The Kruskal-Wallis test showed significant differences among the groups (P<.01). TB and RX had the lowest mean retention values; COP, COP 10, and COP 50 were equal to ZP, and COP 10 had the highest retention. CONCLUSIONS: The casting retention on implant-abutments provided by COP was similar to that of copings cemented with zinc phosphate and may be influenced by the addition of calcium carbonate.
Subject(s)
Castor Oil/chemistry , Cementation/methods , Dental Cements/chemistry , Dental Implant-Abutment Design , Dental Prosthesis Retention , Bisphenol A-Glycidyl Methacrylate/chemistry , Calcium Carbonate/chemistry , Crowns , Dental Alloys/chemistry , Dental Stress Analysis/instrumentation , Eugenol/chemistry , Humans , Materials Testing , Palladium/chemistry , Polyethylene Glycols/chemistry , Polymethacrylic Acids/chemistry , Polyurethanes/chemistry , Resin Cements/chemistry , Resins, Plant/chemistry , Silver/chemistry , Stress, Mechanical , Temperature , Time Factors , Water/chemistry , Zinc Oxide/chemistry , Zinc Phosphate Cement/chemistryABSTRACT
Posterior teeth restorations have changed the contemporary treatment philosophy influencedby the aesthetic demand of patients, progress of adhesive material science and techniques forpreservation and rehabilitation of affected teeth by dental caries and trauma. The development ofOnlay restorations with semi-direct technique in endodonticaly teeth treated aims to preserve theremaining surfaces, to reduce the possibility of fracture and polymerization shrinkage. In addition,better restoration adaptation and marginal seal, resistance to wear and dimensional stability areachieved. This case reports the rehabilitation of an endodontically treated permanent maxillary firstmolar in a 13 years old- patient who attended the Araraquara School of Dentistry, Brazil, using Miris2 Composite resin with semi-direct technique and obtaining an aesthetic and functional restoration ina single appointment. The fundaments and clinical guidelines of the procedure are detailed, based onthe review of the literature that supports this conservative treatment.
La demanda estética por parte de los pacientes es cada vez mayor, igualmente, los avances de la cienciapara obtener mejores materiales y técnicas para la preservación y rehabilitación de dientes afectadospor caries dentaria, trauma, entre otros han logrado revolucionar las restauraciones adhesivaspara dientes posteriores generando un cambio en la filosofía de tratamiento contemporáneo. Laelaboración de restauraciones onlay con técnica semi-directa en dientes tratados endodónticamentebusca conservar la mayor cantidad de superficies remanentes para reducir la probabilidad defractura, disminuir la contracción de polimerización, lograr mejor adaptación y selle marginal, mayorresistencia al desgaste y estabilidad dimensional del material. Este caso reporta la rehabilitaciónde un primer molar superior derecho permanente tratado endodónticamente de un paciente de 13años de edad que asiste a la Facultad de Odontología de Araraquara - UNESP, Brasil, usando resinacompuesta Miris 2 con técnica semi-directa, obteniendo en una sola cita una restauración estéticay funcional. Así mismo, se explican los fundamentos y directrices clínicas para la elaboración de lamisma, teniendo en cuenta la revisión de literatura que apoya este tipo de tratamiento conservador.
