Cephalometric evaluation of the effect of third molar eruption on skeletal facial height
Abstract
Introduction: The influence of third molar eruption on vertical facial growth has been evaluated less frequently by researchers. The aim of this study was cephalometric evaluation of the effect of third molar eruption on skeletal facial height.
Materials and Methods: The subjects in this cross-sectional/analytical study consisted of thirty patients with four completely erupted third molars with proper occlusal relationships (group A) and thirty patients without third molars (group B). All the subjects were 19‒24 years of age and had Class I occlusal relationship. None of the subjects had received any orthodontic and surgical treatment. Cephalograms of subjects were traced carefully. The mean of parameters measured in both groups were compared by independent t-test (α = 0.05).
Results: Means of Frankfort mandibular angle (FMA) in groups A and B were 32.26 ± 5.82 and 27.20 ± 2.53 degrees, respectively, with significant differences between the two groups (p value = 0.001). Means of gonial angles in groups A and B were 123.86 ± 1.26 and 124.5 ± 4.88 degrees, respectively, with no significant difference between the two groups (p value = 0.491). Regarding ANB and SNA angles, no significant differences were observed between the two groups (p value = 0.335) and (p value = 0.127), respectively. However, there were significant differences between the two groups in relation to SNB angle (p value = 0.05). There were significant differences in relation to posterior facial height: anterior facial height ratios and sella‒ nasion distances between the two groups (p value = 0.001). However, there were no significant differences between the two groups in relation to nasion‒ menton distances (p value = 0.733).
Conclusion: Craniofacial development in patients with completely erupted third molars is different from those with no third molars. Patients with third molars have larger FMA angles and greater posterior facial height (PFH). Eruption of third molars does not influence the gonial angle.
Key words: Cephalometry, Third molar, Tooth eruption.
Based on the obtained author agreement upon submission, “Journal of Isfahan Dental School” is the copyright owner of the published material. However, this is an open access journal which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author.
Article evaluation process:
- The article assessment will be started after being submitted on the journal site and will be sent to the reviewers for scientific evaluation after receiving the submission fee and if the structural principles are observed. The results of the judging will be reviewed by the Writers' Council and, if necessary, amendments will be sent to the responsible author. After final correction and approval, the articles are published in the journal in the order of the article approval date.
- Clinical trial articles must be previously registered on the site (www.IRCT.ir) and their registration number must be mentioned at the beginning of the Materials and Methods.
- Case report articles must have a consent letter and a code of ethics.
- The journal has the right to accept or reject the article and also reserves the right to scientific and literary editing and, if necessary, summarizing the article. After submitting the article, all rights to it belong to the magazine.
- The journal will not be liable for litigation between authors as well as the correctness of the academic rank or affiliation of the authors. Also, the accuracy of the contents of the article is the responsibility of all the author (s).
- After the article enters the final stage (References check), it is not possible for the author (s) to cancel the publication of the article.
- After the Proof version is approved by the responsible author, it is not possible to change the number or order of the authors of the article.
Address: Journal of Isfahan Dental School, School of Dentistry, Isfahan University of Medical Sciences, Hezar Jerib St. Isfahan, IRAN.
Postal Code: 81746-72461
Phone: 031-37925523
Fax: 031-36687080
Email: jids@dnt.mui.ac.ir
URL: http://jids.journalonweb.ir/index.php/jids
