2007 年 20 巻 3 号 p. 459-464
Factors that influence decisions regarding the placement of implants include anatomical factors, such as bone mass and the mandibular canal, and prosthetic factors, such as function and esthetics.
One of the anatomical factors is the presence of adjacent teeth, which mainly restrict the mesiodistal location of implant placement. The presence of mesial adjacent canine teeth or premolars in particular, influences decisions regarding the position of implant placement for implant therapy in the mandibular molar region. According to the measurements made in this study, the roots of 85.9% of the lower canines and premolars as a whole were located in the distal direction, and it was especially noteworthy that the roots of 94.8% of the canine teeth were located in the distal direction. In addition, even the average measured distance of the canines and premolars as a whole was 1.47 mm,which was large when compared with the mesiodistal width of the teeth.
Thus, implant therapy must be performed without damaging adjacent teeth, aware of the fact that in almost all cases the roots of the lower canine and premolar teeth are located in the distal direction.