The
Effect of the Angle of Axial Surface of Root Cap upon the Abutment Tooth During Simulated Incisal Clenching
–The
Boundary Condition of Considering Human Mandible Movement
Daisuke
Yamanaka*, Tetsuo Ohyama *,**,
Shinya Nakabayashi*, Yuusuke Katakura *, Tendo Uchida*,
Naoki Tsukimura*,**, Tomohiko Ishigami*,**
*Department of Partial Denture Prosthodontics,
**Division of Clinical Research,
Abstract
The design of root cap up on the
abutment tooth has an influence for the abutment tooth and the circumferential
tissue. In this study, it was analyzed the effects of the axial surface angle
of root cap for the abutment tooth and the circumferential tissue using three-dimensional
finite element analysis. It was built three-dimensional finite element model of
human mandible, and a complete overdenture model with root caps delivered on
mandibular bilateral canine was evaluated. And, three inclination angles (0, 15
and 30 degrees) on the axial surface of the root cap were designed. Incisal
clenching was simulated newly with the joint element
which permitted rotations and translations and it was applied on the mandibular
condyle and bite points on complete overdentures. The loading condition set up the vector
and force of muscular contraction of the incisal clenching. The stress concentration was detected on the anterior
surface in comparison with the posterior surface of cortical bone, and in the
model of which inclination angle of the axial surface set 30 degrees the
minimum principal stress showed the smallest value. However, the force
added to the abutment tooth decreased when inclination angle of the axial surface was
inclined.