Inter-radicular distance between the maxillary second premolar and the first molar
정서린, 유선경, 김민수, 임성훈,
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정서린 ( Jeong Seo-Rin ) - Chosun University School of Dentistry Department of Orthodontics
유선경 ( Yu Sun-Kyoung ) - Chosun University School of Dentistry Department of Oral Anatomy
김민수 ( Kim Min-Su ) - Chosun University School of Dentistry Department of Orthodontics
임성훈 ( Lim Sung-Hoon ) - Chosun University School of Dentistry Department of Orthodontics
Abstract
The aim of this study was to evaluate the effect of the curvature of mesiobuccal root of the maxillary first molar in the space between the maxillary second premolar and the first molar, which is the preferred site for mini-implant placement. In this study, cone-beam computed tomography (CBCT) data of 85 patients (36 male, 49 female; 14-38 years old) were used to measure the mesiobuccal root length of the maxillary first molar and the distance from the cementoenamel junction (CEJ) to the most curved point of the mesiobuccal root of the maxillary first molar. The interradicular distance between the maxillary second premolar and the first molar, and the buccolingual width of alveolar bone and cortical bone thickness at the plane 4-, 6-, and 8-mm apical to the CEJ were also measured. The length of the mesiobuccal root of the maxillary first molar was 11.2 ± 1.1 mm, and the distance from CEJ to the most curved point was 6.4 ± 0.7 mm, which was about 57.4% of the root length. The interradicular distances were almost same at the 4- and 6-mm planes, but increased significantly between the 6- and 8-mm planes. Although the buccolingual widths of the alveolar bone was increased apically, cortical bone thicknesses were not different among the 4-, 6-, and 8-mm planes. The interradicular distance does not increase between the 4-mm and 6-mm planes from CEJ because of the presence of the curvature of the mesiobuccal root of maxillary first molar.
키워드
Curvature; Inter-radicular space; Maxillary first molar; Mini-implant; Tooth root
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