Lamia Arthur F, McDonald N J
Gen Dent. 2015 Sep-Oct;63(5):33-7.
The aim of this study was to evaluate, using microcomputed tomography (µCT), the frequency of conjoined mesial canals in first and second mandibular molars with a single distal canal. Mandibular first (n = 114) and second molars (n = 114) with mature apices were randomly selected from a pool of extracted teeth. The specimens were decoronated to establish clinically the existence of a single distal canal. Teeth with C-shaped canals were discarded. Each tooth was scanned with a µCT system and evaluated in 3 dimensions. Of 228 examined teeth, 206 were included in the study. Of these, 129 (62.6%) displayed conjoined mesial canals with a single portal of exit, and 77 (37.4%) displayed 2 distinct mesial canals with 2 separate portals of exit. Of the teeth with conjoined mesial canals, 71 (55.0%) were second molars and 58 (45.0%) were first molars. Conjoined mesial canals exhibited a mean interorifice distance of less than 3.00 mm. These data regarding morphological patterns alert clinicians to the possible need to modify endodontic techniques in mandibular molars with single distal canals.
本研究的目的是使用微型计算机断层扫描（µCT）评估具有单个远中根管的下颌第一和第二磨牙中联合近中根管的发生率。从一批拔除的牙齿中随机选取根尖成熟的下颌第一磨牙（n = 114）和第二磨牙（n = 114）。去除牙冠以临床确定单个远中根管的存在。有C形根管的牙齿被丢弃。每颗牙齿用µCT系统进行扫描并进行三维评估。在228颗检查的牙齿中，206颗被纳入研究。其中，129颗（62.6%）显示有单个出口的联合近中根管，77颗（37.4%）显示有两个独立出口的两个不同近中根管。在有联合近中根管的牙齿中，71颗（55.0%）是第二磨牙，58颗（45.0%）是第一磨牙。联合近中根管的平均口间距离小于3.00 mm。这些关于形态模式的数据提醒临床医生，对于具有单个远中根管的下颌磨牙，可能需要修改牙髓治疗技术。
