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The effect of preparation procedure on implant-abutment joint stability 임플랜트 지대주의 삭제과정이 결합부 안정성에 미치는 영향
Jang-Wook Lee, Chang-Whe Kim, Kyung-Soo Jang, Young-Jun Lim
이장욱, 김창회, 장경수, 임영준

Statement of problem: Little is known about the effect of abutment preparation procedure
on de-torque values in different implant platform and the relationship of final de-torque values
with different implant platform size.
Purpose: This study evaluated the effect of abutment preparation procedure on de-torque val-
ues in different implant platform and the relationship of final  de-torque values with different implant
platform size.
Material and method: Six ITI implants (2 narrow-neck implants, 2 regular-neck implants,
2 wide-neck implants) and six Brånemark implants (2 narrow platforms, 2 regular platforms, 2
wide platforms) were embedded in each acrylic resin block with epoxy resin. Eighteen synOcta®
abutments (6 narrow-neck implant-abutments, 6 regular-neck implant-abutments, 6 wide-neck
implant-abutments) and eighteen esthetic abutments (6 narrow platform-abutments, 6 regular
platform-abutments, 6 wide platform-abutments) were tightened to each implant with digital torque
gauge. Initial de-torque values were measured using digital torque gauge. After preparation of abut-
ments, Final de-torque values were measured with digital torque gauge.
Results and conclusion:
1. Screws loosening or abutments motion were not detected in all experimental group, but some
scratches of implant-abutment joints were detected in all group.
2. Reduction ratios of final de-torque values were greater than initial de-torque values in all mea-
sured group, except in narrow-neck implant-abutment group (p<0.05).
3. Reduction  ratios  of  final  de-torque  values  in wide-neck  implant-abutment  group were
greater than regular-neck implant-abutment group (p<0.01).
4. The greatest standard deviation value was detected in wide platform group in both implant
systems.

* Keywords: Preparable abutment, Initial de-torque value, Final de-torque value, Screw loosening, Joint stability

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