Characteristics of dental arch and basal bone in permanent dentition Angle Class II malocclusion based on three-dimensional digital models

doi:10.3969/j.issn.2095-4344.2017.36.006

Abstract

Abstract:

BACKGROUND: An orthodontist can gain all comprehensive data about the tooth and jaw based on a model measurement. With the development of CAD/CAM, a three-dimensional (3D) digital model shows more accurate information than a traditional model.
OBJECTIVE: To explore the characteristics of dental arch and basal bone in permanent dentition Angle Class II malocclusion based on 3D digital models.
METHODS: Thirty cases of normal occlusionin permanent dentition were selected as control group, and 30 cases of Angel II1 and 30 cases of Angel II2 malocclusion were enrolled, respectively. Three kinds of 3D digital models were established using a 3shape R700 scanner and measured with Orthoanalyzer 2013. The data of individual normal occlusion and Angel II1 and Angel II2 data were analyzed statistically with SPSS 19.0 software respectively. Intergroup comparison was analyzed by the least significant difference test method.
RESULTS AND CONCLUSION: Maxillary and mandibular dental arch length and maxillary dental arch width of front section (3-3) and middle section (4-4)/maxillary basal bone length and mandibular basal bone width of middle section (4-4): II2 > normal occlusion > II1 (P < 0.05). Mandibular dental arch front width of section (3-3)/maxillary and mandibular basal bone length: normal occlusion > II1> II2 (P < 0.05). Maxillary dental arch width of behind section (6-6)/maxillary basal bone width of front section (3-3) and middle section (4-4)/mandibular basal bone width of front section (3-3): normal occlusion > II2 > II1 (P < 0.05). The angle of tooth long axis and plane: there was significant difference in the Angel II1, II2 and normal occlusion (P < 0.05). Maxillary posterior-teeth area (coronary): II1 > II2 > normal occlusion (P < 0.05). Mandibular posterior-teeth area (coronary): II2 > normal occlusion > II1 (P < 0.05). The dental arch of Angel II1 was narrow and long in shpape, and the dental arch of Angel II2 was wide and short in shape. Sagittal discordant existed in the anterior of Angel II1, such as lip-side incline of maxilla and mandible. Coronal discordant existed in the median and posteior of Angel II1, such as palatine-side incline of the maxillary dental arch, and buccal-side incline of the mandible. Sagittal discordant existed in the anterior of Angel II2, e.g. lingual-side incline of the maxilla and mandible. No discordant existed in the posterior section of Angel II2.

中国组织工程研究杂志出版内容重点：组织构建；骨细胞；软骨细胞；细胞培养；成纤维细胞；血管内皮细胞；骨质疏松；组织工程

Key words: Jaw, Malocclusion, Angle Class II, Computers, Tissue Engineering

CLC Number:

R318

Wu Jie1, Wang Chao-ran2, Zhao Wei1, Sun Meng-jiao1, Li Hong-fa1. Characteristics of dental arch and basal bone in permanent dentition Angle Class II malocclusion based on three-dimensional digital models [J]. Chinese Journal of Tissue Engineering Research, 2017, 21(36): 5769-5774.

Figures/Tables 2

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