Effect of cyclic load on vertical misfit of prefabricated and cast implant single abutment

Abstract

ObjectiveThe purpose of this in vitro study was to evaluate misfit alterations at the implant/abutment interface of external and internal connection implant systems when subjected to cyclic loading.Material and MethodsStandard metal crowns were fabricated for 5 groups (n=10) of implant/abutment assemblies: Group 1, external hexagon implant and UCLA cast-on premachined abutment; Group 2, internal hexagon implant and premachined abutment; Group 3, internal octagon implant and prefabricated abutment; Group 4, external hexagon implant and UCLA cast-on premachined abutment; and Group 5, external hexagon implant and Ceraone abutment. For groups 1, 2, 3 and 5, the crowns were cemented on the abutments and in group 4 crowns were screwed directly on the implant. The specimens were subjected to 500,000 cycles at 19.1 Hz of frequency and non-axial load of 133 N in a MTS 810 machine. The vertical misfit (μm) at the implant/abutment interface was evaluated before (B) and after (A) application of the cyclic loading. Data were analyzed statistically by using two-away ANOVA and Tukey’s post-hoc test (p<0.05).ResultsBefore loading values showed no difference among groups 2 (4.33±3.13), 3 (4.79±3.43) and 5 (3.86±4.60); between groups 1 (12.88±6.43) and 4 (9.67±3.08), and among groups 2, 3 and 4. However, groups 1 and 4 were significantly different from groups 2, 3 and 5. After loading values of groups 1 (17.28±8.77) and 4 (17.78±10.99) were significantly different from those of groups 2 (4.83±4.50), 3 (8.07±4.31) and 5 (3.81±4.84). There was a significant increase in misfit values of groups 1, 3 and 4 after cyclic loading, but not for groups 2 and 5.ConclusionThe cyclic loading and type of implant/abutment connection may develop a role on the vertical misfit at the implant/abutment interface.

Microscopic evaluation of implant platform adaptation with UCLA-type abutments: in vitro study

“…The number of measurements obtained in the present study should be highlighted, as it represents a unique differential factor in relation to other researches [17][18][19][20] .…”

Wear of double crown systems: electroplated vs. casted female part

“…In general, every in vitro wear test setup has to face the limitations due to the enormous amount of different aspects affecting the in vivo wear processes 14 , 15 , 18 , 19 , 21 , 25 , 28 . The simulation is used to examine two different material combinations under defined conditions regarding one considerable aspect, in this study the wear stability.…”

“…He also demonstrated that the retentive force is not further increased by a removal speed exceeding 30 mm/min. There is no need to accelerate the test speed any further 19 . The speed of 120 mm/min was a compromise for the test performed in the present study, as it also allows performing the test in an acceptable span of time.…”