Eskoz N, Weine F S
Loyola University School of Dentistry, Maywood, IL, USA.
J Endod. 1995 Jan;21(1):38-42. doi: 10.1016/S0099-2399(06)80555-8.
The purpose of this study was to investigate the canal configuration in the mesiobuccal root of the maxillary second molar. The canal configuration of the mesiobuccal root of the maxillary second molar need not be the same as that of the maxillary first molar. Several studies have been attempted to clarify the configuration of the second molar, usually via postoperative evaluation, sectioning, or radiography. To follow more closely the clinical procedure, this study involved access cavity preparation and radiographs taken with files in place. Of the 73 extracted maxillary second molars investigated, 67 teeth (91.8%) had 3 roots whereas 6 teeth (8.2%) had 2 roots. In the three rooted teeth, the mesiobuccal roots of 40 (59.7%) were classified as type I (single canal from orifice to apex), 14 (20.9%) were type II (two canals merging short of the apex into a single canal at the apex), 11 (16.4%) were type III (two separate and distinct canals from orifice to apex), and 2 (3%) were type IV (single canal at the orifice, dividing in midroot into two canals exiting at the apex).
本研究的目的是调查上颌第二磨牙近中颊根的根管形态。上颌第二磨牙近中颊根的根管形态不一定与上颌第一磨牙相同。已有多项研究试图通过术后评估、切片或影像学检查来阐明第二磨牙的形态。为了更紧密地遵循临床操作流程，本研究涉及开髓洞形制备以及在根管内插入锉时拍摄的X线片。在研究的73颗拔除的上颌第二磨牙中，67颗牙（91.8%）有3个牙根，而6颗牙（8.2%）有2个牙根。在有3个牙根的牙齿中，40颗（59.7%）的近中颊根被分类为I型（从根管口到根尖为单根管），14颗（20.9%）为II型（两根管在根尖上方合并为一根管），11颗（16.4%）为III型（从根管口到根尖为两根独立且不同的根管），2颗（3%）为IV型（根管口为单根管，在牙根中部分为两根根管并在根尖处穿出）。
