Resumo

ABREU, Celina Wanderley de; VASCONCELLOS, Luis Gustavo Oliveira de; BALDUCCI, Ivan  e  NISHIOKA, Renato Sussumu. A comparative study of microstrain around three-morse taper implants with machined and plastic copings under axial loading. Braz. J. Oral Sci. [online]. 2010, vol.9, n.1, pp. 11-15. ISSN 1677-3225.

AIM: To evaluate the occurrence of microstrain around morse taper implants in straight configuration under axial load in a cast monoblock framework. METHODS: Three implants were inserted in a polyurethane block and microunit abutments were installed on the implants with 20 Ncm torque. Plastic and machined copings were adapted on the preset waxing to fabricate the framework (n=5). Four strain gauges were attached on the upper surface of the block and then each framework was tightened on the abutments and a vertical load of 30 kg was applied to five points of the framework. RESULTS: The data obtained in the strain gauge analysis were subjected to twoway ANOVA and Tukey's test (α=0.05). There was statistically significant difference (p=0.0222) for the factor application point and the mean microstrain values were: application point B 402,04με, point A 401.21με, point E 390.44με , point D 341.76με and point C 309.19 με. CONCLUSIONS:There was no microstrain difference between plastic and machined copings during axial loading. Difference in the application point was observed, but remained within bone physiological limits.

Palavras-chave : dental implant; fixed prosthesis; axial load; strain gauge; morse taper.