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THREE-DIMENSIONAL FINITE ELEMENT STRESS ANALYSIS OF SINGLE IMPLANT RESTORATION USING DIFFERENT FIXTURE AND ABUTMENT SCREW DIAMETERS 단일치 임플랜트 지지 보철물에서 고정체와 지대주 나사 직경의 차이에 따른 삼차원 유한요소법적 응력 분석
Joo-Hong Kwon, Min-Ho Choi, Yu-Lee Kim, Hye-Won Cho
권주홍, 최민호, 김유리, 조혜원

Statement of problem. As the effects of the various diameters of fixture and abutment screw
on stress distribution was not yet examined, this study focused on the different design of single
implant restoration using three dimensional finite element analysis.
Purpose. This study was to compare five different fixture-abutment combinations for single
implant supported restorations with different fixture and abutment screw diameters.  
Material & methods. The five kinds of finite element models were designed by 3 diameter
fixtures (O / 3.3, 3.75, 5.0 mm) with 3 different abutment screws (O / 1.5, 1.7, 2.0 mm). The crown
for mandibular first molar was made using UCLA abutment according to Wheeler’ s anatomy. 244
N was applied at the central fossa with two different loading directions, vertically and oblique-
ly (30。 ) and at the buccal cusp vertically. Maximum von Mises stresses were recorded and com-
pared in the supporting bone, crowns, fixtures, and abutment screws.
Results.
1. The stresses in supporting bone and implant-abutment structure under oblique loading were
greater than those under vertical or offset loading. The stresses under vertical loading were the
least among 3 loading conditions regardless of the implant and abutment screw diameters.
2. The stresses in the narrow implants were greater than the wider implants. The narrow implant
with narrow abutment screw showed highest stresses in the lingual crest, but the narrow implant
with standard abutment screw showed highest stress in abutment screw.  
3. The stresses of abutment screws were influenced by the diameter of fixtures and loading con-
ditions. The wide implants showed least difference between two different abutment screw diam-
eters.
Conclusions. The wide implants showed lesser stresses than the narrow implants and affect-
ed least by the different abutment screw diameters. The narrow implants with standard abut-
ment screw showed highest stresses in the lingual bony crest under oblique loading.

* Keywords: Wide fixture, Narrow fixture, Abutment screw diameter, Finite element analysis

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