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上颌第二磨牙的牙根及根管系统的数目和形态变异较大,最常见的牙根及根管数目为3牙根3根管。关于上颌第二磨牙4根管的发生率各报道结果不一,为8.1%～29.7%[1-4]。但可达成共识的是,上颌第二磨牙4根管大多为近中颊根双根管,即MB2。笔者在临床中发现1例罕见的上颌第二磨牙腭侧双根管病例,经锥形束CT(cone beam computed tomography,CBCT)证实为4牙根4根管,现报道如下。1病例资料患者男,28岁,以“右侧上颌后牙自发性疼痛2d”为主诉来中国医科大学口腔医学院牙体牙髓科就诊。检查:7颊牙合面大面积龋坏穿髓,探诊疼
The number and morphology of the root and root canal system of the maxillary second molars varied greatly. The most common root and root canal number was 3 root and 3 root canal. The report on the incidence of the four maxillary second molar four reports varied from 8.1% to 29.7% [1-4]. However, consensus could be reached that most of the maxillary second molar four root canal near the mesiobuccal root, MB2. The author found in a clinical case of a rare case of palatal double root canal of the second maxillary second molars, confirmed by cone beam computed tomography (CBCT) of 4 root canal 4, are reported below. 1 Case data Male, 28 years old, with “right maxillary posterior teeth spontaneous pain 2d ” as the main complaint to China Medical University School of Stomatology dentistry dental treatment. Check: 7 cheek teeth face a large area of caries worn pulp, exploration pain