The Study On The Insertion Site Of Miniscrews At The Mandibular Buccal Shelf Area By Cone-Beam Computed Tomography

Objective:To evaluate the best available implantation site of microsrews in the buccal shelf area by using cone beam computer tomographic,and to guide the clinicians implant microscrews safely.Materials and Methods:Select the CBCT images of 86 patients,11 women and 27 men aged from 19 to30 years old.The average age is(24.0±2.5)years old.The CBCT images of 86 patients were used to reconstructe the three-dimensional computed tomographic images.Faultages of 3mm,6mm,9mm from the alveolar crest in the mandibular buccal shelf area(the buccal side of the buccal root of the first molar and the second molar)were selected to measure the bucco-lingual bone thickness from the surface of the corresponding root to the surface of the bony cortex.SPSS 21.0 software was used for statistical analysis.Results:There was no statistically significant difference in the measured values between left and right side,as well as male and female(p>0.05).The buccal bone thickness of the disto-buccal root of the second molar in mandible was as its maximum at 3heights,and the buccal bone thickness of the mesio-buccal root of the first molar in mandible was as its minimum at 3 heights.The maximum value of bone thickness was(9.17± 1.93)mm,and the minimum value was(0.96 ±0.48)mm.Conclusion:There are no differences between male and female as well as left and right in the bone thickness of the buccal shelf.But the bone thickness in the buccal shelf varies sagittally and vertically,It had a tendency to increase from the occlusal direction to the root side,from near to middle,and there were individual difference.thus,we need to evaluate bone mass and implant sites before implant operation.