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Changes in Arch Dimension and Incisor Position in Patients Treated Non-Extraction with Passive Self-Ligating Brackets

Byun, Paul (2019) Changes in Arch Dimension and Incisor Position in Patients Treated Non-Extraction with Passive Self-Ligating Brackets. Master's Thesis, University of Pittsburgh. (Unpublished)

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The recent paradigm shift in orthodontics towards non-extraction treatment has been facilitated with the introduction of newer appliance systems such as self-ligating brackets. OBJECTIVE: The purpose of this study was to investigate the effects of moderate to severe dental crowding on changes in incisor position and arch dimension in patients treated non-extraction using the Damon passive self-ligating system. It was hypothesized that patients do not experience a significant amount of labial movement of the incisors due to space being gained through arch expansion. MATERIALS AND METHODS: Previous orthodontic records of 15 patients with a mean pre-treatment age of 14.4 years were obtained at the University of Pittsburgh Department of Orthodontics. The inclusion criteria were: treatment with Damon Q (Ormco) passive self-ligating brackets, class I malocclusion treated non-extraction, severe maxillary dental crowding (>6 mm), and a complete permanent dentition. The initial and final cephalograms and digital dental casts were evaluated. Paired t-tests were used to perform intragroup comparisons of pretreatment and posttreatment values. RESULTS: The mean amount of crowding was 8.93 mm in the maxillary arch and 4.77 mm in the mandibular arch. Resolution of severe maxillary crowding resulted in an increase of 9.16° in incisor inclination and 3.05mm in incisor protrusion. Resolution of moderate mandibular crowding resulted in an increase of 5.87° in incisor inclination and 1.95 mm in incisor protrusion. In the maxilla, the greatest arch width increase was at the first premolar (4.39 mm) followed by second premolar (4.24 mm), canine (1.85 mm), and molar (1.65 mm). In the mandible, the order of the width increase was similar - first premolar (2.95mm), second premolar (2.23mm), canine (2.12mm) and molar (0.90mm). All changes were statistically significant (p<.01). CONCLUSION: The resolution of moderate to severe crowding resulted in significant proclination and protrusion of the incisors along with a significant increase in arch width.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Byun, Paulpbyun12345@gmail.compeb32
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorKalra, Varunvak3@pitt.eduvak3
Committee MemberBurnheimer, Johnjmb334@pitt.edujmb334
Committee MemberShah, Nileshnhs3@pitt.edunhs3
Date: 11 June 2019
Date Type: Publication
Defense Date: 7 June 2019
Approval Date: 11 June 2019
Submission Date: 31 May 2019
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 35
Institution: University of Pittsburgh
Schools and Programs: School of Dental Medicine > Dental Science
Degree: MDS - Master of Dental Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Damon Self-ligating bracket Arch dimension Incisor proclination
Date Deposited: 11 Jun 2019 19:24
Last Modified: 11 Jun 2019 19:24


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