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Paper Information

Journal:   JOURNAL OF RESEARCH IN DENTAL SCIENCES   summer 2019 , Volume 16 , Number 2 (60) #f00662; Page(s) 87 To 96.

Comparative Evaluation of Microgap at the Interface of Titanium and Zirconium Abutments Following Oblique Cyclic Loading: An in vitro Study

Author(s):  Mazaheri Azita, Nourbaksh Mehran, Jalalian Ezatolha, Zarbakh Arash, Hamzehkhosroshahi Hadi*
* Oral disease Dept., Faculty of Dentistry,Tehran Medical Sciences, Azad University,Tehran,Iran
Background and Aim: Microgap in the implant-abutment interface is one of the main challenges in the treatment of two-piece implants. This study aimed to investigate the effect of two types of abutments (zirconia and titanium) on microgap at implant-abutment interface area under oblique cyclic loading in vitro. Methods and Materials In this in vitro study, 12 implant-abutment assemblies were used, each containing six sets with either zirconia or titanium abutments and vertically mounted in the modified resin blocks of auto-polymerized polyester base. The specimens were then subjected to oblique cyclic loading of 75 N at a 30 ± 2 degrees angle to the longitudinal axis of the implant with a frequency of 1 Hz in 500, 000 cycles, equivalent to 20 months of human mastication. For the microgap analysis, direct observation from the top was used with a scanning electron microscopy (SEM) with a magnification of 5000×. Statistical analysis was used to compare the microgap before and after the application of loading with the paired t-test. Results: The amount of microgap before force application in the titanium abutment group was (2. 6± 0. 7) significantly higher than the zirconia abutments (1. 9± 0. 5) (P = 0. 033). The dimension of the microgap in the titanium abutment group significantly decreased following cyclic loading (P = 0. 047), but in the zirconia group showed a significant increase (P = 0. 035). Finally, the dimension of the microgap following oblique cyclic loading in the titanium abutment group (2. 0± 0. 8) was not significantly different with the zirconia abutments (2. 7± 0. 9) (P = 0. 262). Conclusion: The difference of microgap after oblique cyclic loading between two types of titanium abutment and zirconium abutment is not significant, and both are clinically acceptable.
Keyword(s): Gap,Titanium alloy,Zirconium,Implant abutment
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