インプラント治療のための歯科用コーンビームCT 画像による下顎骨臼歯部の解剖学的形態計測

抄録

The objective of this study was to identify clinical indices for the safe and appropriate determination of insertion sites in mandibular molar implant treatment. The subjects were 286 patients (153 men, 133 women; age 26-78 years) who underwent cone-beam CT scanning prior to implant surgery. The patients were immobilized at the forehead and external auditory meatus in the upright position, and the cone-beam CT image was screened in the occlusal plane horizontally in the state of centric occlusion.
The angle of inclination of the mandible and vertical bone diameter on the lingual side, which are anatomical factors that affect implant insertion planning, were measured on the cone-beam CT images.
As a result, the angle of inclination of the mandible increased from the mesial to the distal side which was consistent with previous reports.
The angle of inclination of the mandible was ≧30º in the second molar in 26.0% of patients. Vertical bone diameter on the lingual side was ≦12 mm in the first molar in 43.78% of patients and ≦12 mm in the second molar in 62.66% of patients, and a high proportion of mandibles posed problems for implant planning.
The morphology of the lingual side of the mandible is difficult to diagnose from panoramic X-ray images. We must perform accurate preoperative diagnosis, including CT scanning, and carry out implant treatment with a high degree of predictability, with safety as the basic premise.