The fitness of copings constructed over UCLA abutments and the implant, constructed by different techniques: casting and casting with laser welding

摘要

The alternative for the reposition of a missing tooth is the osteointegrated implant being the passive adaptation between the prosthodontic structure and the implant a significant factor for the success of this experiment, a comparative study was done between the two methods for confectioning a single prosthodontic supported by an implant. To do so a screwed implant with a diameter of 3.75mm and a length of 10.0mm (3i Implant innovations, Brasil) was positioned in the middle of a resin block and over it we screwed 15 UCLA abutments shaped and anti-rotationable (137CNB, Conex?o Sistemas de Próteses, Brasil) with a torque of 20N.cm without any laboratorial procedure (control group - CTRLG). From a silicon model 15 UCLA-type calcinatable compounds (56CNB, Conex?o Sistemas de Próteses, Brasil) were screwed (20 N.cm), received a standard waxing (plain buccal surface) and were cast in titanium (casting group - CG) and other 15 compounds, UCLA - type shaped in titanium (137 CNB, Conex?o Sistemas de Próteses, Brasil) received the same standard waxing. These last copings were cast in titanium separated from each other and were laser-welded to the respective abutments on their border (Laser-welding group - LWG). The border adaptation was observed in the implant/compound interface, under measurement microscope, on the y axis, in 4 vestibular, lingual, mesial and distal referential points previously marked on the block. The arithmetical means were obtained and an exploratory data analysis was performed to determine the most appropriate statistical test. Descriptive statistics data (μm) for Control (mean±standard deviation: 13.50 ± 21.80; median 0.00), for Casting (36.20±12.60; 37.00), for Laser (10.50 ±12.90; 3.00) were submitted to Kruskal-Wallis ANOVA, a = 5%. Results test showed that distorsion median values differ statistically (kw = 17.40; df =2; p = 0.001<0.05). Dunn's (5%) test show difference between Casting and the two others. Conclusion: on the y axis, the smallest distortion values were obtained by the laser welding group.