Revisión sistemática de la resistencia de prótesis fijas provisionales sobre implantes

Abstract

Objective: the main objective is to search for articles that analize the fracture resistence of materials frequently used for making temporary crowns over dental implants.

Materials and methods: the pubmed and Cochrane data bases were used for the research, in order to find articles about the fracture resistence of diferent techniques, cad cam and conventional techniques, for making temporary crowns over dental implants. The PICOS system was used to determine the main features of articles during the research. The PICOS system is part of the PRISMA recomendations for systematic reviews and metanalysis.

Results: three studies accomplised with the selection criteria previously determined, they used temporary materials such as PMMA, acrylic resins to analize the fracture resistence to compression and thermocycling. Two of the studies made temporary crowns, and the last one used a temporary material block. The results were: in the fist study to PMMA: 3034.3 (Tooth – P) and 1602.9 N (Tooth – T), in the group TiBase 1510.5 (TiBase – P) and 963.6 N (TiBase – T), in the group Chair 1609.4 (Chair – P) and 1253.0 N (Chair – T). In the second study Cerasmart G.C., in the group CHAIR 977. N, in the group LAB 1130.6 N and in the group TOOTH 1893. 0 N. The third study Yilmaz compared ten PMMA temporary material and acrylic resins, he found an average range to fracture the crown of 789 to 1380 nw. Conclussions: the results demonstrated that it doesn't depend on the technique, but it does the material used, for instance cadcam materials are more resistent in a long term compared to conventional materials and conventional techniques under mechanic fatigue and thermocycling.