Biomechanical rationale for intentionally inclined implants in the posterior mandible using 3D finite element analysis.
OBJECTIVE
Since natural dental arches usually form Monson or Spee occlusal curvatures among the posterior teeth, they tend to incline in mesial and lingual directions. The purpose of this study was to examine the biomechanical rationale for placing implants according to these curvatures in the mandibular posterior region.


METHODS
A 3-dimensional finite element model was created in which 2 implants were placed in the mandibular molar area. Stress distribution in the bone around the implants was analyzed under different distal implant inclinations.


RESULTS
Stress in the cervical area of the mesial and distal implants and the surrounding bone was higher when the implants were placed parallel to each other compared to when the distal implant was placed with a mesial or mesiolingual inclination.


CONCLUSIONS
The slightly smaller effect of a mesiolingual inclination compared to a mesial inclination can be explained by the large cantilever on the buccal side of the superstructure.


CONCLUSIONS
Within the limitations of this study, it was suggested that there is a biomechanical rationale for placing implants in the posterior mandible area with a mesial inclination similar to that of natural teeth. It was also suggested that too much lingual inclination can put the implant at risk of overload.
Satoh
Takuya
T
Division of Interdisciplinary Dentistry, Faculty of Dentistry, Osaka University, Osaka, Japan.
Maeda
Yoshinobu
Y
Komiyama
Yataro
Y
D000539:Alveolar Process / Q000502:physiology; D001641:Bicuspid; D019245:Compressive Strength; D003198:Computer Simulation; D003724:Dental Arch / Q000033:anatomy & histology; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D003799:Dental Stress Analysis / Q000379:methods*; D004548:Elasticity; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible / Q000033:anatomy & histology; D008954:Models, Biological; D008963:Molar; D013314:Stress, Mechanical
D015921:Dental Implants