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目的比较锥形束CT(CBCT)与常规曲面断层片在下颌阻生智齿拔除术前设计中的应用价值。方法对97例135颗下颌阻生智齿行常规曲面断层片检查,其中41例共52颗进一步行CBCT检查并纳入本项研究。根据曲面断层片和CBCT所提供的影像资料,分别做出术前设计,判断能否根据影像资料决定术中去骨的部位、是否劈/截冠、分根以及确定脱位方向。采用SAS 9.3.1软件包对数据进行配对资料χ2检验。结果相对于曲面断层片,CBCT能在术前更准确、量化地判断去骨部位和数量、是否需要分根、决定脱位方向,差异有统计学意义(P<0.001);在术前决定是否需要劈/截冠上,两者差异无统计学意义。结论CBCT在下颌阻生智齿拔除术前设计中能够为术者提供充分的三维影像信息,便于术者选择合适便利的进路和采用正确的策略、方法,减少邻近组织结构的损伤,确保手术顺利完成,从而减少手术并发症的发生。
Objective To compare the value of cone beam computed tomography (CBCT) and conventional curved surface tomography in the preoperative design of mandibular impacted wisdom tooth extraction. Methods A total of 135 cases of 135 mandibular impacted wisdom teeth underwent conventional curved surface examination. Of 41 cases, 52 were further examined by CBCT and included in this study. According to the imaging data provided by the curved surface slice and CBCT, preoperative design was made respectively to determine whether the surgery can determine the site of bone removal, whether to split / crown, root and determine the direction of dislocation according to the image data. Using SAS 9.3.1 software package for data paired χ2 test. Results Compared with the curved surface slice, CBCT could determine more accurately and quantitatively the number of deboned parts and the number of debridement, whether the root was needed or not, and the difference was statistically significant (P <0.001) Cleave / cut crown, the difference between the two was not statistically significant. Conclusion CBCT can provide full three-dimensional imaging information to the surgeon in the preoperative extraction of mandibular impacted wisdom tooth, which is convenient for the surgeon to choose appropriate and convenient approach and adopt the correct strategies and methods to reduce the damage of the adjacent tissue and ensure the smooth operation Complete, thereby reducing the incidence of surgical complications.