| Comparison of mandibular arch changes during alignment and leveling with 2 preadjusted edgewise appliances. | |
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MedLine Citation:
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PMID: 19732667 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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INTRODUCTION: Our objective was to compare the effects of 2 preadjusted appliances on angular and linear changes of the mandibular incisors, and transverse mandibular arch dimensional changes over a minimum of 30 weeks. This was a prospective, randomized, controlled, clinical trial a the Royal London Hospital, School of Dentistry, in London and the Kent and Canterbury Hospital in Canterbury, United Kingdom. METHODS: Sixty- six consecutive patients satisfying the inclusion criteria were enrolled and randomly allocated to treatment with a self-ligating bracket system (SmartClip, 3M Unitek, Monrovia, Calif) and conventional preadjusted edgewise brackets (Victory, 3M Unitek). Initial study models and cephalograms were obtained within a month of starting the trial. All subjects received treatment with the following archwire sequence: 0.016-in round, 0.017 x 0.025-in rectangular, 0.019 x 0.025-in rectangular martensitic active nickel-titanium archwires, and 0.019 x 0.025-in stainless steel archwires. Final records, including study models and a lateral cephalogram, were collected a minimum of 30 weeks after initial appliance placement. Lateral cephalograms were assessed for treatment-related changes in mandibular incisor inclination and position. Transverse dimensional changes in intercanine, interpremolar, and intermolar dimensions, and the amount of crowding alleviated during the study period were assessed by comparison of pretreatment and posttreatment models. All measurements were made with a digital caliper (150 mm ISO 9001 electronic caliper, Tesa Technology, Renens, Switzerland). RESULTS: Sixty patients completed the study. After adjustment for pretreatment values, duration of treatment, and amount of crowding alleviated during the study period, bracket type had little effect on incisor inclination (P = 0.437) and positional changes (P = 0.35), and intercanine (P = 0.967), inter-first premolar (P = 0.495), and inter-second premolar (P = 0.905) dimensions. However, the self-ligating appliance produced slightly more expansion in the molar region, a difference that was statistically significant (P = 0.009). Pretreatment values for incisor inclination (P = 0.044) and transverse dimensions (P = 0.000) affected inclination and transverse changes, respectively, with proclination less likely when the labial segment was proclined at the outset and expansion unlikely during leveling and alignment in wider arches. Greater alleviation of crowding during the study period resulted in more incisor proclination (P = 0.000) and advancement (P = 0.000). CONCLUSIONS: There was little difference overall in the pattern of arch alignment and leveling related to the 2 preadjusted appliances. However, there was a statistically greater increase in intermolar width in the group treated with the self-ligating appliance, although the difference was only 0.91 mm. |
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Authors:
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Padhraig S Fleming; Andrew T DiBiase; Grammati Sarri; Robert T Lee |
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Publication Detail:
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Type: Comparative Study; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics Volume: 136 ISSN: 1097-6752 ISO Abbreviation: - Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-09-07 Completed Date: 2009-09-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8610224 Medline TA: Am J Orthod Dentofacial Orthop Country: United States |
Other Details:
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Languages: eng Pagination: 340-7 Citation Subset: D; IM |
Affiliation:
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Specialist registrar, Orthodontics, Royal London Hospital, London, United Kingdom. padhraigfleming@hotmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Bicuspid / pathology Cephalometry / instrumentation, methods Child Cuspid / pathology Dental Arch / pathology* Dental Models Female Follow-Up Studies Humans Incisor / pathology* Male Malocclusion / pathology, therapy Mandible / pathology* Molar / pathology Orthodontic Appliance Design* Orthodontic Brackets* Orthodontic Wires Prospective Studies Tooth Movement / instrumentation*, methods Treatment Outcome |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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