Comportamento biomecânico de dentes tratados endodônticamente reabilitados com próteses fixas múltiplas e unitárias

Abstract

The aim of the present study was to evaluate the biomechanical behavior of endodontically teeth treated with different of intracanal retainers. Thus, the retainers used were tested in different prosthetic designs (single and three-unit fixed dental prostheses) varying the material used, glass fiber post and cast post and core. The research was divided into three studies: (1) an in vitro study that evaluated the influence of cement and the presence or absence of ferule, as well as the use of direct composite resin without the use of an intracanal retainer in the rehabilitation of endodontically treated teeth; (2) a systematic literature review and an one-arm meta-analysis with the purpose of investigating the fracture resistance properties of materials (zirconia, lithium disilicate and metal ceramics) used in the manufacture of three-element fixed dental prostheses (FDP); and (3) an in vitro study that determined the fracture resistance of three-element FDP, assessing the influence of different intracanal retainers (glass fiber post and cast post and core) and their arrangement on the prosthesis. The first and third studies underwent survival tests followed by a fracture test, and a significance level of 5% was used in the statistical analysis of quantitative data. The study 2 was described based on PRISMA, seeking to answer which is the fracture strength of the different materials used for three-unit FDP. The meta-analysis results showed higher overall fracture strength values for the metal ceramic prostheses. The results of the in vitro studies showed that in unitary prostheses, the retainer material and the height of the remaining tooth structure directly influence the load to fracture values, and that in three-unit FDP no statistically significant differences were found regardless of position or material used for the retainer. In conclusion, it was found that the rehabilitation of endodontically treated teeth can be performed in different ways maintaining the success rates, also, the use of glass fiber post and cast post and core can be satisfactorily performed independently of the type of space to be rehabilitated. Additionally, the materials available for three-unit fixed dental prostheses present satisfactory overall fracture strength values.