Kartal N, Ozçelik B, Cimilli H
Department of Endodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
J Endod. 1998 Jun;24(6):417-9. doi: 10.1016/S0099-2399(98)80024-1.
The objective of this study was to investigate further internal anatomy of maxillary premolars. Six hundred recently extracted maxillary first and second premolar teeth were used in this study. One-half of the teeth were maxillary first premolars, the other half were maxillary second premolars. The teeth were stored in 10% formalin solution, and a standard clearing technique was applied with some modifications. Finally, ink-dyed root canal systems were evaluated by a dissecting light microscope. Each tooth was examined as to the number of roots and root canals and their types, ramifications of the main root canals, and location of apical foramina and transverse anastomoses. Examination of the root canal systems of the teeth was based on Vertucci's classification. The incidence of type I canals (one canal) for the maxillary first premolars was 8.66%, whereas 89.64% of the total samples demonstrated two canals (from type II to type VII). Only 1.66% of maxillary first premolars were type VIII or type IX (three canals). Regarding maxillary second premolars, the incidence of type I (one canal) was 48.66%, whereas it was 50.64% for type II to type VII (two canals). Type VIII (three canals) was found in 0.66% of the total sample.
本研究的目的是进一步探究上颌前磨牙的内部解剖结构。本研究使用了600颗近期拔除的上颌第一和第二前磨牙。其中一半牙齿为上颌第一前磨牙，另一半为上颌第二前磨牙。将牙齿保存在10%的福尔马林溶液中，并对标准的透明技术进行了一些改进后应用。最后，通过解剖光学显微镜对墨染的根管系统进行评估。检查每颗牙齿的牙根和根管数量及其类型、主根管的分支情况、根尖孔和横向吻合的位置。牙齿根管系统的检查基于韦尔图奇分类法。上颌第一前磨牙I型根管（单根管）的发生率为8.66%，而总样本中89.64%表现为双根管（II型至VII型）。上颌第一前磨牙中只有1.66%为VIII型或IX型（三根根管）。对于上颌第二前磨牙，I型（单根管）的发生率为48.66%，II型至VII型（双根管）的发生率为50.64%。VIII型（三根根管）在总样本中的占比为0.66%。
