Effect of Chlorhexidine and Ethanol Application on Long-term Push-out Bond Strength of Fiber Posts to Dentin.

AIM: The aim of this study was to evaluate the effect of chlorhexidine and ethanol application on the push-out bond strength and bond durability of fiber posts cemented with an etch-and-rinse adhesive system/resin cement to intraradicular dentin. MATERIALS AND METHODS: Fifty-four bovine roots were shaped for the cementation of a fiberglass post and received the application of 37% phosphoric acid. They were then randomly divided into three groups, according to the type of dentin treatment (n = 18) performed: no treatment (control group), 100% ethanol, or 2% chlorhexidine. Next, the adhesive system (Adper Scotch Bond Multipurpose Plus, 3M ESPE) was applied to the dentin, according to the manufacturer's instructions. Glass fiber posts were cemented with dual resin cement (Rely X ARC, 3M ESPE). After 48 hours, the specimens were serially sectioned for push-out test analysis, providing two slices from each root third (cervical, medium and apical), one of which was tested immediately and the other stored in distilled water for 180 days. The data were analyzed with three-way analysis of variance (ANOVA) for repeated measures and Tukey's test at a 5% significance level. RESULTS: Intraradicular treatment with chlorhexidine yielded the highest bond strength means, followed by ethanol treatment. The control group presented the lowest bond strength means. Water storage exerted no effect on bond strength values. CONCLUSION: Both chlorhexidine and ethanol improved push-out bond strength to intraradicular dentin, with the former providing the best results, regardless of the storage time. CLINICAL SIGNIFICANCE: The application of 2% chlorhexidine or 100% ethanol may be an important step that can be taken to enhance bond strength of fiber posts to intraradicular dentin, when dual resin cements are used.

Utilização de implante estreito na reposição de incisivo lateral superior com espa‡o m‚sio-distal restrito – relato de caso / Use of narrow implant in replacement of the upper lateral incisor with space distal mesio restricted – case report

A reposição de incisivos laterais superiores utilizando implantes dentários ‚ um desafio para o implantodontista. Diversas são as causas da falta destes incisivos, dentre elas, traumas dentários, cáries ou agenesia dental que consiste em uma anomalia comum de desenvolvimento, gerando a ausência de elementos dentários. Frequentemente os incisivos laterais superiores apresentam dimensão mésio-distal reduzida, inferiores a 6 mm. Nestas situações, diversos fatores devem ser levados em consideração no momento do planejamento, dentre eles, o diâmetro do implante a ser utilizado, tipo de coneção protética do implante e tratamento de superfície do implante a fim de permitir uma ótima condição e estabilidade dos tecidos moles e duros peri-implantares. Sendo assim, o objetivo deste artigo ‚ apresentar um relato de caso clínico para substituição de um incisivo lateral superior com pouco espaço mésio-distal, em que se utilizou um novo sistema de implante AxiomTM (Anthogyr) com 2,8 mm de diâmetro e um sistema de conexão do tipo cone morse com provisionalização imediata. Os resultados estéticos e funcionais avaliando o ideal perfil de emergência, a qualidade dos tecidos peri-implantares e a distância intra-óssea foram excelentes. Tanto do ponto de vista clínico quanto biológico, o implante Anthogyr AxiomTM de 2,8 mm de diâmetro mostrou-se uma excelente alternativa para solucionar a ausência de incisivos laterais superiores com espaço mésio-distal restrito

The replacement of upper lateral incisors using dental implants is a challenge for implantologists. There are several causes of the lack of incisors teeth, among them, dental trauma, cavities or dental agenesis (a common abnormality of development resulting on the absence of teeth). It is common to observe upper lateral incisors with reduced mesio- -distal dimension (less than 6 mm). In these cases, several factors must be considered while planning the treatment: the diameter of the implant; abutment connection type; treatment of the implant surface treatment to enable stability of and peri-implant soft and hard tissue. Thus, the aim of this paper was to present a clinical case of replacement of a maxillary lateral incisor with reduced mesio-distal space, using a new implant system AxiomTM (Anthogyr) with 2.8 mm diameter and a cone morse connection system with provisional restoration. Ideal emergence profile, peri-implant tissue quality and intraosseous distance were evaluated and excellent results were observed. The Anthogyr AxiomTM implant of 2.8 mm diameter proved to be an excellent solution for the absence of maxillary lateral incisors with reduced mesio-distal space