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KMID : 1004520100260040389
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Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 4 p.389 ~ p.403
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The Effect of Types of Abutment and Dynamic Loading on Microgap Between Implant Fixture and Abutment
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Oh Byung-Doo
Choi Yu-Sung
Shin Soo-Yeon
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Abstract
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Titanium and gold-alloy abutments have been used for a long-time in the clinical situations, but the use of zirconia abutments also increased. This study was designed to compare and evaluate the microgap differences according to types of abutment and dynamic loading. Titanium abutment, zirconia abutment and gold-alloy abutment (UCLA plastic) were connected into titanium implants of external hexagonal structure US II Ø 3.75 × 11.5 mm (Osstem Co., Seoul, Korea) with the tightening torque of 30 Ncm. A sine type dynamic loading of 25-250 N and 30° inclination from long axis was applied for 105 times. Using the SEM both before and after the loadings, implant-abutment interfaces were analyzed on the labial, palatal, mesial and distal surface. The microgaps before and after the loading were compared, no statistically significant difference was observed caused by the dynamic loading on the labial, palatal, mesial or distal surface. Statistically significant difference was observed between UCLA and titanium group and between UCLA and zirconia group on both before and after the loading(p<0.05). No statistically significant difference was found between titanium and zirconia group. Loadings for 105 times did not show significant effect to the microgaps between implants and abutments.
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KEYWORD
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dynamic loading, implant-abutment interface, microgap, zirconia
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