Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study

A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry. Abstract ASSESSMENT OF THE ROLE THAT SECOND MOLARS PLAY IN BITE-OPENING DURING ORTHODONTIC TREATMENT IN ADOLESCENTS: A RETROSPECTIVE, CEPHALOMETRIC STUDY DEGREE DATE:...

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Main Author: Trockel, Christopher
Format: Others
Published: NSUWorks 2013
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Online Access:https://nsuworks.nova.edu/hpd_cdm_stuetd/46
https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1058&context=hpd_cdm_stuetd
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spelling ndltd-nova.edu-oai-nsuworks.nova.edu-hpd_cdm_stuetd-10582019-10-20T04:14:57Z Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study Trockel, Christopher A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry. Abstract ASSESSMENT OF THE ROLE THAT SECOND MOLARS PLAY IN BITE-OPENING DURING ORTHODONTIC TREATMENT IN ADOLESCENTS: A RETROSPECTIVE, CEPHALOMETRIC STUDY DEGREE DATE: DECEMBER 6, 2013 Christopher B. Trockel, D.D.S. COLLEGE OF DENTAL MEDICINE NOVA SOUTHEASTERN UNIVERSITY Thesis Directed By: Shiva Khatami D.D.S., Ph.D, Committee Chair Mark Hall, D.D.S., Committee Member Abraham Lifshitz, Committee Member Objectives: This study aimed to investigate the role that second molars play in increasing the facial vertical dimension by comparing vertical changes experienced in growing patients, who had their second molars incorporated into the orthodontic appliance, with those that did not. The study investigated associations between the vertical changes experienced through treatment and the initial vertical classification of the patients (normo-, hypo-, and hyperdivergent). Background: Many studies have investigated the changes in the vertical dimensions that occur in orthodontic treatment. It has been shown that almost all orthodontic appliances produce extrusion whether desired or not. In theory, this extrusion may lead to an increase of the skeletal vertical dimension. Conventional wisdom says that second molars play a significant role in vertical control during treatment. Therefore, some practitioners advocate viii incorporating the second molars as soon as possible in treatment to help open the bite. It is also thought that it may be wise to not incorporate the second molars during treatment at all in cases with an open bite tendency. Methods: Eighty de-identified pre-treatment cephalometric radiographs (40 with second molars bonded and 40 without second molars bonded) from growing patients treated at the orthodontic clinic at Nova Southeastern University were analyzed and compared to their post-treatment analogs. Twelve linear and angular measurements were made (overbite, maxillary molar to palatal plane, mandibular molar to mandibular plane, upper anterior dentoalveolar height, lower anterior dentoalveolar height, upper anterior facial height, lower anterior facial height, total posterior facial height, lower posterior facial height, UAFH/LAFH ratio, mandibular plane angle, and Y-axis). Results: The results indicated that the vertical dimension was not significantly altered based solely on whether or not the second molars were incorporated into the orthodontic appliance. Changes experienced by both groups (bonded and non bonded) and all three subgroups (hypo-, normo-, and hyperdivergent) were consistent with what would be expected for growth alone. Conclusion: Bonding second molars in a growing population during orthodontic treatment does not significantly affect the vertical dimension, regardless of the patient's initial skeletal vertical classification. 2013-01-01T08:00:00Z campusthesis application/pdf https://nsuworks.nova.edu/hpd_cdm_stuetd/46 https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1058&context=hpd_cdm_stuetd Student Theses, Dissertations and Capstones NSUWorks Dentistry Orthodontics and Orthodontology
collection NDLTD
format Others
sources NDLTD
topic Dentistry
Orthodontics and Orthodontology
spellingShingle Dentistry
Orthodontics and Orthodontology
Trockel, Christopher
Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
description A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry. Abstract ASSESSMENT OF THE ROLE THAT SECOND MOLARS PLAY IN BITE-OPENING DURING ORTHODONTIC TREATMENT IN ADOLESCENTS: A RETROSPECTIVE, CEPHALOMETRIC STUDY DEGREE DATE: DECEMBER 6, 2013 Christopher B. Trockel, D.D.S. COLLEGE OF DENTAL MEDICINE NOVA SOUTHEASTERN UNIVERSITY Thesis Directed By: Shiva Khatami D.D.S., Ph.D, Committee Chair Mark Hall, D.D.S., Committee Member Abraham Lifshitz, Committee Member Objectives: This study aimed to investigate the role that second molars play in increasing the facial vertical dimension by comparing vertical changes experienced in growing patients, who had their second molars incorporated into the orthodontic appliance, with those that did not. The study investigated associations between the vertical changes experienced through treatment and the initial vertical classification of the patients (normo-, hypo-, and hyperdivergent). Background: Many studies have investigated the changes in the vertical dimensions that occur in orthodontic treatment. It has been shown that almost all orthodontic appliances produce extrusion whether desired or not. In theory, this extrusion may lead to an increase of the skeletal vertical dimension. Conventional wisdom says that second molars play a significant role in vertical control during treatment. Therefore, some practitioners advocate viii incorporating the second molars as soon as possible in treatment to help open the bite. It is also thought that it may be wise to not incorporate the second molars during treatment at all in cases with an open bite tendency. Methods: Eighty de-identified pre-treatment cephalometric radiographs (40 with second molars bonded and 40 without second molars bonded) from growing patients treated at the orthodontic clinic at Nova Southeastern University were analyzed and compared to their post-treatment analogs. Twelve linear and angular measurements were made (overbite, maxillary molar to palatal plane, mandibular molar to mandibular plane, upper anterior dentoalveolar height, lower anterior dentoalveolar height, upper anterior facial height, lower anterior facial height, total posterior facial height, lower posterior facial height, UAFH/LAFH ratio, mandibular plane angle, and Y-axis). Results: The results indicated that the vertical dimension was not significantly altered based solely on whether or not the second molars were incorporated into the orthodontic appliance. Changes experienced by both groups (bonded and non bonded) and all three subgroups (hypo-, normo-, and hyperdivergent) were consistent with what would be expected for growth alone. Conclusion: Bonding second molars in a growing population during orthodontic treatment does not significantly affect the vertical dimension, regardless of the patient's initial skeletal vertical classification.
author Trockel, Christopher
author_facet Trockel, Christopher
author_sort Trockel, Christopher
title Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
title_short Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
title_full Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
title_fullStr Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
title_full_unstemmed Assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
title_sort assessment of the role that second molars play in bite-opening during orthodontic treatment in adolescents : a retrospective, cephalometric study
publisher NSUWorks
publishDate 2013
url https://nsuworks.nova.edu/hpd_cdm_stuetd/46
https://nsuworks.nova.edu/cgi/viewcontent.cgi?article=1058&context=hpd_cdm_stuetd
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