Abstract
Abstract Introduction The fit between abutment and implant is crucial to determine the longevity of implant-supported prostheses and the maintenance of peri-implant bones. Objective To evaluate the vertical misfit between different abutments in order to provide information to assist abutment selection. Material and method UCLA components (N=40) with anti-rotational system were divided as follows: components usinated in titanium (n=10) and plastic components cast proportionally in titanium (n=10), nickel-chromium-titanium-molybdenum (n=10) and nickel-chromium (n=10) alloys. All components were submitted to stereomicroscope analysis and were randomly selected for characterization by SEM. Result Data were analyzed using mean and standard deviation and subjected to ANOVA-one way, where the groups proved to statistically different (p=<0.05), followed by Tukey’s test. Conclusion The selection of material influences the value of vertical misfit. The group machined in Ti showed the lowest value while the group cast in Ni Cr showed the highest value of vertical misfit.
Highlights
The fit between abutment and implant is crucial to determine the longevity of implant-supported prostheses and the maintenance of peri-implant bones
Longevity of implant prostheses mainly depends on passive seating and accurate fit of the base of the implant and of the pillar abutment[1], factors desired by every professional who performs prosthesis implants
The abutment-implant misfit does not influence the loss of screw torque[5,6], but the advance in this misfit results in increasingly higher stress over prosthetic structures, abutment screws and peri-implant bone tissue[7]
Summary
The fit between abutment and implant is crucial to determine the longevity of implant-supported prostheses and the maintenance of peri-implant bones. Longevity of implant prostheses mainly depends on passive seating and accurate fit of the base of the implant and of the pillar abutment[1], factors desired by every professional who performs prosthesis implants. Passive seating results in proper dissipation of tension, as the lack of adaptation may lead to screw fracture[2,3]. Complications such as fracture or loss of function of screws and prosthesis are regularly associated with non-compliance with the aforementioned requirements. The abutment-implant misfit does not influence the loss of screw torque[5,6], but the advance in this misfit results in increasingly higher stress over prosthetic structures, abutment screws and peri-implant bone tissue[7]. The UCLA pillar adapts to implant module edges[9] so
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