Applications Of Cone Beam Computed Tomography In The Practice Of Implant Denitstry

The dental implant is a new technology developed in recent decades, a repairdentition defect or denture, dental implants because of its comfort, appearance retention,do not need to change the characteristics of adjacent teeth, gradually been accepted bymany dentists and patients. The effect of high-resolution three-dimensional imaging ofthe oral cone-beam CT (Cone-Beam Computerized Tomography, of CBCT) examinationtechniques plays a vital role in treatment plan and postoperative evaluation. Toinvestigate the role of CBCT in dental implant.Experiment I: Measurement and analysis of bone anatomical structureof mandibular posterior teeth with CBCTObjective: To measure the three-dimensional structure of the mandibular canal inthe mandibular posterior and adjacent relationship, according to the measurement resultsand statistical data to calculate the common position of the mental foramen.Materialsand Methods: From march2010to december2011,100patients with CBCTexamination, who met the shooting conditions, were chosen from2000patients accepteddental implant operation in posterior zone of manbidular in the Second out-patientdepartment of Peking University Dental Hospital. The measurements included:(1) thedistance between the upper edge mandibular canal between alveolar crest (D1);(2) thedistance between the inferior border of inferior alveolar canal and alveolar crest (D2);(3)the distance between the lateral border inferior alveolar canal and the buccal cortex ofmandible (D3);(4) the distance between the interior border of inferior alveolar canal andlingual cortex of the mandible (D4). Each distance measure3times and the mean value were recorded. The location of the mental foramen was observed in the different gendergroups, the version of spss16.0statistical software for two independent samples t-test onthe same side of the same tooth-bit data of the male and female. Results: The distancefrom mandibular posterior region of the mandibular canal to around in different sexgroups, four distance difference were not statistically significant (P＞0.05), mentalforamen of two cases (1%) is located in the apical area of the first premolars;80cases(39%) mental foramen located between the first premolar and second premolar; Mentalforamen of107cases(54.5%) in the second premolar apical; Mental foramen of80cases(39%) located between the first premolar and second premolar, Conclusion: of CBCTimages can clearly show the anatomical structure and the mandibular canal adjacent tothe mandibular teeth the bone, as well as the location of mental foramen. Experiment II: CBCT image measurement in clinical research in dentalimplantsObjective: To observe the preoperative measurement of implant length and CBCTimages after the length implant after surgery, obtained a linear relationship, calculate theactual height of the area to be planted, help implant surgeon to select a suitable length ofthe implant to reduce the incidence of postoperative complications. Materials andMethods: During January2011and December2011, a total of600patients prepared toaccept the dental implant surgery in the outpatient department of the Peking UniversityDental Hospital, the CBCT check was done before operateing,68patients met the criteriaof this study.38cases of patients accepted CBCT examination before and after operation.Each patient before and after surgery was examined by the same radiographers CBCTradiography, the piece was read by two physicians and upper left central incisor lengthwere measured with the Ez3D2009Premium software preoperative and postoperative,calculate the actual height of the intended planting area. SPSS16.0software for statisticalanalysis.Results:38patients, male19cases, nineteen cases of women. Age distributionbetween27～68years old, average age,58.8±8.8years old. Maxillary missing teethdistribution: three cases of the first premolar, second premolar6cases and first molar21cases,8cases of the second molar. Implant the actual length of the CBCT image measurements: total length of the implant surgery after shooting CBCT images on thetotal length of the sinus ridge away from the height of the mean value, the results of thet-test. Difference between the implant the CBCT measuring results and the actual lengthof a significant difference (P＜0.05), the image length is greater than the actual length of.Conclusion: CBCT can objectively reflect the posterior region of anatomy. alveolar boneheight was measuremed before implant surgery, and then select the appropriate implant,reduc the sides effects of surgery.