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Obeservations on association between third molar agenesis and craniofacial morphology.
J Orofac Orthop. 2017 Nov; 78(6):504-510.JO

Abstract

OBJECTIVE

This study was designed to examine the relationship between third molar agenesis and skeletal morphology in the Chinese population.

MATERIALS AND METHODS

A total of 1043 patients' records were analyzed with panoramic radiographs and cephalograms. Congenitally missing third molars were assessed with respect to gender, jaw, and side, and assessed in various types of facial morphology. Linear, angular, and proportional cephalometric measurements were analyzed and compared among the samples. For the evaluation of results, the following statistics were used: the Pearson χ 2 test, one-way ANOVA, and the Student-Newman-Keuls method.

RESULTS

The overall prevalence of third molar agenesis was 28.7%. Missing third molars were more common in the maxilla and on the right side, while the difference was not statistically significant (P > 0.05) between genders. Every hypodontia group had a smaller SN-GoGn angle, Y-axis-FH angle, and a larger S-Go/N-Me ratio. The group with third molar agenesis in both jaws had smaller SNA and Wits values. The frequency of third molar agenesis in subjects with a Class II malocclusion was significantly lower than in other types of malocclusion (P < 0.05), and the incidence of third molar agenesis in hypodivergent growth pattern was higher than in other patterns (P < 0.05).

CONCLUSION

The results demonstrate a possible association between third molar agenesis and both sagittal and vertical craniofacial morphology.

Authors+Show Affiliations

State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China. Department of Stomatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China.State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China. xhan@scu.edu.cn. Department of Orthodontics, West China School of Stomatology, Sichuan University, 14# 3rd Section, Ren-Min-Nan Road, Chengdu, 610041, China. xhan@scu.edu.cn.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29080079

Citation

Huang, Yi, et al. "Obeservations On Association Between Third Molar Agenesis and Craniofacial Morphology." Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopadie : Organ/official Journal Deutsche Gesellschaft Fur Kieferorthopadie, vol. 78, no. 6, 2017, pp. 504-510.
Huang Y, Yan Y, Cao J, et al. Obeservations on association between third molar agenesis and craniofacial morphology. J Orofac Orthop. 2017;78(6):504-510.
Huang, Y., Yan, Y., Cao, J., Xie, B., Xiao, X., Luo, M., Bai, D., & Han, X. (2017). Obeservations on association between third molar agenesis and craniofacial morphology. Journal of Orofacial Orthopedics = Fortschritte Der Kieferorthopadie : Organ/official Journal Deutsche Gesellschaft Fur Kieferorthopadie, 78(6), 504-510. https://doi.org/10.1007/s00056-017-0109-x
Huang Y, et al. Obeservations On Association Between Third Molar Agenesis and Craniofacial Morphology. J Orofac Orthop. 2017;78(6):504-510. PubMed PMID: 29080079.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Obeservations on association between third molar agenesis and craniofacial morphology. AU - Huang,Yi, AU - Yan,Yinqiu, AU - Cao,Jing, AU - Xie,Bingjie, AU - Xiao,Xueling, AU - Luo,Mengqi, AU - Bai,Ding, AU - Han,Xianglong, Y1 - 2017/10/27/ PY - 2016/12/18/received PY - 2017/06/19/accepted PY - 2017/10/29/pubmed PY - 2018/10/20/medline PY - 2017/10/29/entrez KW - Congenital absence KW - Craniofacial morphology KW - Hypodontia KW - Third molar agenesis SP - 504 EP - 510 JF - Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie JO - J Orofac Orthop VL - 78 IS - 6 N2 - OBJECTIVE: This study was designed to examine the relationship between third molar agenesis and skeletal morphology in the Chinese population. MATERIALS AND METHODS: A total of 1043 patients' records were analyzed with panoramic radiographs and cephalograms. Congenitally missing third molars were assessed with respect to gender, jaw, and side, and assessed in various types of facial morphology. Linear, angular, and proportional cephalometric measurements were analyzed and compared among the samples. For the evaluation of results, the following statistics were used: the Pearson χ 2 test, one-way ANOVA, and the Student-Newman-Keuls method. RESULTS: The overall prevalence of third molar agenesis was 28.7%. Missing third molars were more common in the maxilla and on the right side, while the difference was not statistically significant (P > 0.05) between genders. Every hypodontia group had a smaller SN-GoGn angle, Y-axis-FH angle, and a larger S-Go/N-Me ratio. The group with third molar agenesis in both jaws had smaller SNA and Wits values. The frequency of third molar agenesis in subjects with a Class II malocclusion was significantly lower than in other types of malocclusion (P < 0.05), and the incidence of third molar agenesis in hypodivergent growth pattern was higher than in other patterns (P < 0.05). CONCLUSION: The results demonstrate a possible association between third molar agenesis and both sagittal and vertical craniofacial morphology. SN - 1615-6714 UR - https://www.unboundmedicine.com/medline/citation/29080079/Obeservations_on_association_between_third_molar_agenesis_and_craniofacial_morphology_ L2 - https://dx.doi.org/10.1007/s00056-017-0109-x DB - PRIME DP - Unbound Medicine ER -