摘要
目的采用锥形束CT观测下颌第一磨牙牙根的解剖学形态,计算出桩道制备的合理空间,指导临床桩道的制备。方法对71例患者的121颗下颌第一磨牙的牙根采用锥形束CT进行扫描,在横断面、矢状面、冠状面重建三维数据图像,按照桩道制备的要求进行分析设计。结果下颌第一磨牙可以设计3个桩道:远中根桩道空间较大,有效可用长度为(7.19±0.91)mm,根尖上方4 mm处桩道直径为(0.80±0.12)mm;近中根有效可用长度为(6.92±1.02)mm,颊侧桩道在根尖上方4 mm处直径为(0.71±0.08)mm,舌侧桩道在根尖上方4 mm处直径为(0.71±0.07)mm。桩道应制备成一定的锥度。结论下颌第一磨牙桩道制备空间受到多种因素影响,变化较大;桩道制备应遵循个性化设计原则以达到最佳效果。锥形束CT可以提供可靠的影像学依据。
Objective To measure the root anatomic topography of mandibular first molar using cone beam CT（CBCT）,calculate the proper space for dowel preparation.Methods The roots of 121 mandibular first molars from 71 patients were scanned by CBCT,the images from cross section,sagittal plane,and coronal plane were got respec-tively.The dowel preparation spaces according to established three dimensional images and dowel preparation require-ments were analyzed.Results Three dowels could be prepared.The dowel length for distal-root was（7.19±0.91） mm, dowel diameter was（0.80±0.12） mm on the level of 4 mm above root apex.The dowel length for mesio-root was（6.92±1.02） mm,and dowel diameter was（0.71±0.08） mm on the lever of 4 mm above root apex for buccal side and（0.71± 0.07） mm for lingual side.Dowel should be prepared cone-shaped.Conclusion Many factors affect dowel preparation,individualized design is needed.CBCT can provide reliable radiographic evidence.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2012年第2期179-182,共4页
West China Journal of Stomatology
