| In recent years, the dental implant has become one of the most common choicesfor the patients who have lost their teeth. As the appearance of CBCT, it provides usimportant image information when we make a treatment plan and evaluate thepostoperative effect. The purpose of this experiment is to explore the important rolethat the CBCT plays in the dental implant.ObjectiveTo study the relationship among the mandibular canal in the mandibular posteriorand the anatomical structure adjacent to it based on CBCT, and to evaluate theaccuracy of the digital panoramic radiography when measuring the distances in themandible.Methods1. CBCT images of100cases were collected from the affiliated StomatologyHospital of Guangzhou Medical University. At the cross section of the mandibular,nine distances were measured: nine distances were measured:1) half the root to thebuccal cortex of the mandible;2) half the root too the lingual cortex of the mandible;3) the apical to the buccal cortex of the mandible;4) the apical to the lingual cortex ofthe mandible;5) the apical to the upper edge of the mandibular canal right below them;6) the lateral border of the mandible canal to the buccal cortex of the mandible;7) the internal border of the mandible canal to the lingual cortex of the mandible;8)the inferior border of mandible canal to the inferior border of mandible;9) the upperedge of the mandibular canal to the alveolar crest.2. To compare the measurements of the distance between the mandibular posteriortooth and the mandible canal by CBCT and by digital panoramic radiography. Then todetermine the accuracy of the digital panoramic radiography in this region.3. To analyze the data by SPSS13.0software analysis system.Results1. The mean value of the distance from half of the root to the buccal cortex of themandible was2.510.95mm, the mean value of the distance from half of the root tothe lingual cortex of the mandible was3.961.16mm;2.The mean value of the distance from the root apex to the buccal cortex of the mandible was5.761.33mm, the mean value of the distance from the root to the lingualcortex of the mandible was6.591.49mm;3. The mean value of the distance from the root apex of mandibular to the upperborder of mandible canal was6.782.70mm;4. The mean value of the distance from the lateral border of mandible canal to thebuccal cortex of the mandible was5.311.60mm, the mean value of the distance fromthe lateral border of the mandible canal to the lingual cortex of the mandible was3.581.26mm;5. The mean value of the distance from the upper border of mandible canal to thealveolar crest was18.563.08mm;6. The mean value of the distance from the inferior border of mandible canal to theinferior border of mandible was8.921.99mm;7. Mental foramen of47cases was located between the mandible first premolar and the second premolar; mental foramen of45cases was located in the apical area of themandible second premolar; mental foramen of6cases was located in the apical areaof the mandible first molar; mental foramen of2cases was located in the apical areaof the mandible first premolar;8. The measurements by digital panoramic radiography were as follows (mm):6.68±3.10,7.92±3.48,7.88±3.38,5.94±2.81,5.48±2.66. The measurements by CBCTwere as follows (mm):6.62±2.60,8.19±2.95,8.17±3.32,6.11±2.55,5.31±2.40. Toanalysis the values with CBCT values by t test, and it showed no statistic significance.Conclusions1. The mean value of the distance from half of the root to the buccal cortex of themandible became larger from front to back; and the distance was largest when it wasat the mandible first molar.2. The mean value of the distance from the root apex to the buccal cortex of themandible became larger from front to back; and the distance was largest when it wasat the mandible first molar.3. The distance from the root apex of mandibular to the upper border of mandiblecanal was largest when it was at mesial root of the mandible first molar, the distancewas shortest when it was at the distal root of the mandible second molar.4. The mean value of the distance from the lateral border of mandible canal to thebuccal cortex of the mandible became larger from front to back, the mean value of thedistance from the lateral border of mandible canal to the lingual cortex of themandible was became shorter from front to back.5. The mean value of the distance from the upper border of mandible canal to thealveolar crest was largest when it was at the mesial root of the mendibule first molar,it was shortest when it was at the distal roof of the mandibule second molar.6. The mean value of the distance from the inferior border of mandible canal to the inferior border of mandible was largest when it was at the mendibule second premolar,it was shortest when it was at the distal roof of the mandibule first molar.7. Mental foramen of47cases was located between the mandible first premolar andthe second premolar; mental foramen of45cases was located in the apical area of themandible second premolar; mental foramen of6cases was located in the apical areaof the mandible first molar; mental foramen of2cases was located in the apical areaof the mandible first premolar.8. When we measure the distance from the mandible posterior teeth to the mandibularcanal respectively by CBCT and by digital panoramic radiography, it shows nosignificant difference.9. According to the data based on the research and the requirement of the dentalimplant, we should seriously consider the implant size and operation plans to fit thewidth and the height of mandible posterior area. |
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