임프란트 나사형태와 치조골 흡수에 따른 응력분산의 3차원 유한요소법적 분석 (The three dimensional finite element analysis of the stress distribution according to the thread designs and the marginal bone loss of the implants)

서지정보

· 발행기관 : 대한악안면성형재건외과학회
· 수록지 정보 : Maxillofacial Plastic Reconstructive Surgery / 30권 / 1호 / 60 ~ 71페이지
· 저자명 : 김일규, 장금수, 조현영, 백민규, 박승훈, 손충렬

초록

The objective of this study is to evaluate the stress distribution according to the thread design and the
marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional
finite element analysis.
The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical
type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and
buttress. In the three dimensional finite element model with 15×15×20mm hexahedron and 2mm cortical
thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the
axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants.
The results were as follows
1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in
cancellous bone, apical portion.
2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial
loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter
5mm implant.
3. The square threads were more effective than the triangular and butress as the longer diameter, the
offset loading, and the worse crown to root ratio.
4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly
increased at 16:3.
From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the
respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular
and buttress threads.

영어초록

The objective of this study is to evaluate the stress distribution according to the thread design and the
marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional
finite element analysis.
The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical
type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and
buttress. In the three dimensional finite element model with 15×15×20mm hexahedron and 2mm cortical
thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the
axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants.
The results were as follows
1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in
cancellous bone, apical portion.
2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial
loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter
5mm implant.
3. The square threads were more effective than the triangular and butress as the longer diameter, the
offset loading, and the worse crown to root ratio.
4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly
increased at 16:3.
From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the
respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular
and buttress threads.

참고자료

· 없음