Three-dimensional evaluation of the relationship between dental and basal arch forms in Skeletal Class Ⅲ malocclusions
10.3760/cma.j.issn.1002-0098.2013.s1.015
- VernacularTitle:骨性Ⅲ类错(牙合)畸形患者下颌牙弓与基骨形态的三维测量研究
- Author:
Wei ZOU
1
;
Jia-Qi WU
;
Tian-Min XU
;
Jiu-Hui JIANG
Author Information
1. 100081,北京大学口腔医学院·口腔医院正畸科
- Keywords:
Malocclusion,Angle Class Ⅲ;
Dental arch;
Odontometry
- From:
Chinese Journal of Stomatology
2013;48(z1):68-71
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the relationship between the dental and arch forms of patients with Skeletal Class Ⅲ malocclusion using three-dimensional(3-D) virtual models.Methods 3-D graphic representations of mandibular casts from 29 Skeletal Class Ⅲ malocclusion patients were created using a laser scanning system.Anatomic reference points were subjectively identified and used to represent the dental arch and the arch form of the basal bone.Results For Skeletal Class Ⅲ malocclusion,a high relationship between the FA(facial axis) and WALA(Will Andrews and Larry Andrew) curves was found.WALA curve's radius of curvature in anterior teeth area was larger than that in FA curve's (rWALA =23.07 > rFA =19.22).In the areas of canine and molar,the coefficients of variations of FA were greater than those of WALA.For both FA and WALA points,the CV of canine areas was larger than the CV of molar areas.Conclusions For Skeletal Class Ⅲ malocclusion patients,high correlation was found between the dental arch form and the basal arch form which can be reflected by FA and WALA points.The basal arch,represented by WALA points,can be used as a clinical guide in making individualized archwire.Both FA and WALA curves were individual and these individual differences were found largely in canine areas.