C-shaped canal system in mandibular second molars part III: The morphology of the pulp chamber floor
C-shaped canal system in mandibular second molars part III: The morphology of the pulp chamber floor
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下颌第二磨牙C形根管系统第三部分：牙髓腔底的形态
DOI：
10.1016/j.joen.2006.07.004
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发表时间：
2006-12-01
影响因子：
4.2
通讯作者：
Fan, Mingwen
中科院分区：
文献类型：
--
作者：
Min, Yi;Fan, Bing;Fan, Mingwen
本研究的目的是研究具有 C 形根管系统的下颌第二磨牙牙髓腔底的形态。从中国本土人群中收集了 44 颗拔除的具有 C 形牙根的下颌第二磨牙。通过微型计算机断层扫描（μ CT）扫描牙齿后，使用三维软件对牙髓腔底进行三维重建。根据牙髓室底的形状以及半岛状底与牙髓室壁之间牙本质融合的位置，将重建图像分为四种类型。 44个重建的髓底中，38个（86.37%）呈C形（半岛状髓底），其中8个（18.18%）具有连续的C形孔口（1型）； 16例（36.37%）半岛状底与颊髓腔壁之间有牙本质融合，形成1个或2个近中孔和1个远中孔（11型）； 14例（31.82%）的半岛样底与近中牙髓腔壁之间有牙本质融合，形成一个大的近颊远端（MB-D）孔和一个小的近中舌孔（111型）。六颗 (13.63%) 牙齿没有 C 形底部配置（IV 型）。分析了孔口下方不同高度的运河的数量和配置。结果表明，本研究中大多数具有 C 形牙根的牙齿也具有 C 形牙髓底，牙髓底解剖学的新分类将有助于定位 C 形根管。
The purpose of this study was to investigate the morphology of pulp chamber floors in mandibular second molars with a C-shaped canal system. Forty-four extracted mandibular second molars with C-shaped roots were collected from a native Chinese population. After the teeth were scanned by the micro-computed tomography (mu CT), the pulp chamber floors were reconstructed three-dimensionally using three-dimensional software. The reconstructed images were classified into four types based on the shape of the pulp chamber floor and the location of the dentin fusion between the peninsular-like floor and the pulp chamber wall. Of the 44 reconstructed pulpal floors, 38 (86.37%) were C-shaped (peninsula-like floor) in which 8 (18.18%) had a continuous C-shaped orifice (type 1); 16 (36.37%) had a dentin fusion between the peninsula-like floor and buccal pulp chamber wall, forming one or two mesial orifice(s) and a distal orifice (type 11); and 14 (31.82%) had a dentin fusion between the peninsula-like floor and the mesial pulp chamber wall, forming a large mesiobuccal-distal (MB-D) orifice and a small mesiolingual orifice (type 111). Six (13.63%) teeth did not have a C-shaped floor configuration (type IV). The number and configuration of the canals at different levels below the orifices were analyzed. The results suggested that most teeth in this study with C-shaped roots also have a C-shaped pulpal floor and that a new classification of pulpal floor anatomy would be helpful in locating the C-shaped canals.