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Third molar agenesis and craniofacial morphology.
Angle Orthod. 2009 May; 79(3):473-8.AO

Abstract

OBJECTIVE

To test the null hypothesis that agenesis of wisdom teeth is not related with any particular craniofacial morphology.

MATERIALS AND METHODS

Ninety-seven patients (aged 13-19 years) were selected and divided into three groups: (1) bilateral agenesis of maxillary third molars, (2) bilateral agenesis of mandibular third molars, and (3) control group without agenesis. Presence or absence of third molars was determined using ortopantomographs. Cephalometric analysis was carried out from lateral teleradiographs, which included linear, angular, and proportional measurements. When data obtained were distributed normally it was analyzed by means of single-factor variance analysis and the Scheffé test (P < .05). When data did not show normality, the Kruskal-Wallis test (P < .05) and the Mann-Whitney test were applied using Bonferroni correction (P < .017). Multivariance discrimination analysis was also carried out.

RESULTS

Values obtained for the mandibular plain of Groups 1 and 2 were significantly lower than those of the Control Group (P =.00 and P =.00, respectively). For Group 2 lower face height was significantly less than for the control group (P =.01), whilst the mandibular arch and the articular angle were significantly greater than in the Control Group (P =.000 and P = .02, respectively). Multivariance discrimination analysis obtained a correct classification in 58.8% of cases.

CONCLUSION

The hypothesis is rejected. Agenesis of the maxillary third molars was related to a reduced mandibular plane angle. Patients with agenesis of the mandibular third molars showed a diminished lower third and a mandibular morphology characteristic of the brachyfacial pattern.

Authors+Show Affiliations

Docent Unit of Orthodontics, Dental Clinic, University of Murcia, Murcia, Spain.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

19413395

Citation

Sánchez, María José, et al. "Third Molar Agenesis and Craniofacial Morphology." The Angle Orthodontist, vol. 79, no. 3, 2009, pp. 473-8.
Sánchez MJ, Vicente A, Bravo LA. Third molar agenesis and craniofacial morphology. Angle Orthod. 2009;79(3):473-8.
Sánchez, M. J., Vicente, A., & Bravo, L. A. (2009). Third molar agenesis and craniofacial morphology. The Angle Orthodontist, 79(3), 473-8. https://doi.org/10.2319/052008-276.1
Sánchez MJ, Vicente A, Bravo LA. Third Molar Agenesis and Craniofacial Morphology. Angle Orthod. 2009;79(3):473-8. PubMed PMID: 19413395.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Third molar agenesis and craniofacial morphology. AU - Sánchez,María José, AU - Vicente,Ascensión, AU - Bravo,Luis Alberto, PY - 2008/05/01/received PY - 2008/07/01/accepted PY - 2009/5/6/entrez PY - 2009/5/6/pubmed PY - 2009/9/16/medline SP - 473 EP - 8 JF - The Angle orthodontist JO - Angle Orthod VL - 79 IS - 3 N2 - OBJECTIVE: To test the null hypothesis that agenesis of wisdom teeth is not related with any particular craniofacial morphology. MATERIALS AND METHODS: Ninety-seven patients (aged 13-19 years) were selected and divided into three groups: (1) bilateral agenesis of maxillary third molars, (2) bilateral agenesis of mandibular third molars, and (3) control group without agenesis. Presence or absence of third molars was determined using ortopantomographs. Cephalometric analysis was carried out from lateral teleradiographs, which included linear, angular, and proportional measurements. When data obtained were distributed normally it was analyzed by means of single-factor variance analysis and the Scheffé test (P < .05). When data did not show normality, the Kruskal-Wallis test (P < .05) and the Mann-Whitney test were applied using Bonferroni correction (P < .017). Multivariance discrimination analysis was also carried out. RESULTS: Values obtained for the mandibular plain of Groups 1 and 2 were significantly lower than those of the Control Group (P =.00 and P =.00, respectively). For Group 2 lower face height was significantly less than for the control group (P =.01), whilst the mandibular arch and the articular angle were significantly greater than in the Control Group (P =.000 and P = .02, respectively). Multivariance discrimination analysis obtained a correct classification in 58.8% of cases. CONCLUSION: The hypothesis is rejected. Agenesis of the maxillary third molars was related to a reduced mandibular plane angle. Patients with agenesis of the mandibular third molars showed a diminished lower third and a mandibular morphology characteristic of the brachyfacial pattern. SN - 0003-3219 UR - https://www.unboundmedicine.com/medline/citation/19413395/Third_molar_agenesis_and_craniofacial_morphology_ L2 - http://www.angle.org/doi/10.2319/052008-276.1?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -