【作者】 吴友农； 吴大明；

【Author】 WU You-nong, WU Da-ming. (Department of Endodontics ,School of Stomatology, Nanjing Medical University. Nanjing 210029 , Jiangsu Province, China)

【机构】 南京医科大学口腔医学院；

【摘要】 目的:研究上颌第一前磨牙根尖区长椭圆形根管的发生情况。方法:选择15个冠根测量值都在标准值范围内的上颌第一前磨牙,利用Isomet低速金刚砂切片机,在距解剖根尖1,2,3,4,5,6 mm处垂直牙体长轴切割。然后在牙科手术显微镜下,利用Photoshop CS 8．0软件测量根管颊舌向和近远中向的最大径。若长径／短径≥2,该根管则被认为是长椭圆形根管。结果:长椭圆形根管发生率为42．0％。单根管颊舌径大于近远中径,长椭圆形根管发生率向根尖降低;双根的颊根管颊舌径大多小于近远中径,但腭根管颊舌径均大于近远中径,长椭圆形根管发生情况更复杂。结论:上颌第一前磨牙根尖区长椭圆形根管的发生情况比较复杂,可能影响根管治疗的质量。更多还原

【Abstract】 PURPOSE: To investigate the occurrence of long oval canals in the apical part of maxillary first premolars. METHODS: Fifteen standard maxillary first premolars were used. Each root was horizontally sectioned at 1, 2, 3, 4, 5 and 6 mm from the anatomic apex by Isomet lowspeed silicon carbide section cutter. The buccal/lingual and mesial/distal diameters of canals were measured with Photoshop CS 8.0 software under a dental operating microscope. A canal was identified as long oval when the ratio of long to short canal diameter was ≥2. RESULTS: The percentage of long canals was 42.0%. In the single canal group, the buccal/lingual diameter was longer than the mesial/distal diameter, and the percentage of long canals decreased apically. In the two canals group, the buccal/lingual diameter was almost shorter than the mesial/distal diameter in buccal canals, but longer in palatal canals, the occurrence of long oval canals was different. CONCLUSION: It is concluded that the occurrence of long oval canals in the apical part of maxillary first premolars was complicated, and they influenced the quality of root canal therapy.更多还原