titanium abutments and zirconia abutments using titanium inserts were compared.Material and methods Two different type of abutment with internal friction connection were assessed: titanium abutment-titanium abutment screw assemblies (Ti-Ti group) and zirconia abutment-titanium insert-titanium abutment screw assemblies (Zr+Ti-Ti group). Fourteen abutments and fourteen implants were used and divided into two groups of seven specimens. Pre-load removal torque values (RTVs) were measured after each assembly was tightened to 35 Ncm with a digital torque gauge. A cyclic load of 300N at a 30 degree angle in reference to the loading axis was applied at a frequency of 15Hz until failure or 1 million cycles by universal testing machine, Instron (E300, Instron, Canton, MA, USA). After cyclic loading, post-load RTVs were measured again. Results 1) The pre-load RTVs for Ti-Ti group and Zr+Ti-Ti group were26±0.8 7Ncm and 25.14±0.75 Ncm. The post-load RTVs for each groups were 18.43±1.17 Ncm and 17.50±1.08 Ncm. 2) The mean removal torque difference for Ti-Ti group and Zr+Ti-Ti group were -7.57±1.61 Ncm and -7.64±1.18 Ncm. Statistical analysis by the independent t-test revealed that RT difference of both groups were not significantly different from each other (P>0.05).3) For all specimens, there was no screw loosening identified by visual or tactile inspection during cyclic loading or after loading.Conclusion Theinternally connected zirconia implant abutment reinforced with a titanium insert shows similar resistance to screw loosening under cyclic loading compared to internally connected titanium implant abutment.
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Screw loosening study of a internal zirconia implant abutment reinforced with a titanium insert
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