Document Detail

Stability of a locking plate and self-drilling screws as orthodontic skeletal anchorage in the maxilla: a retrospective study.
MedLine Citation:
PMID:  20466474     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of this retrospective study was to determine the success rate of an orthodontic skeletal anchorage system consisting of a locking plate and 2 self-drilling screws to intrude the upper molars and detect factors that contribute to its stability. PATIENTS AND METHODS: The subjects were 32 orthodontic and generally healthy patients who had skeletal anchorage plates placed supraperiosteally and unilaterally or bilaterally. The anchorage plate was considered successful if the plate remained stable throughout the period of intrusion of the upper molar without any movement, persistent pain, or infection and was then retrieved without difficulty. The success rates of the anchorage plate were statistically analyzed on the basis of clinically categorized variables. RESULTS: The 32 patients comprised 6 male and 26 female individuals with ages ranging from 11.4 to 35.1 years. The overall success rate of the total 61 plates was 93.4%. No significant differences were observed among the respective success rates analyzed in accordance with gender, age, side of placement, and length of the screws. The thickness of the bony walls that supported the screws was significantly greater in the success group (mean 1.6 +/- SD, 0.2 vs 1.0 +/- 0.1 mm, P < .001). CONCLUSION: Bone thickness is a critical factor in supporting the self-drilling screws and locking plate. Skeletal anchorage combining the plate and 2 screws promises a higher success rate with a thicker bone than with the threshold value of thickness that exists within the 1.1 to 1.4 mm range in the maxillary walls.
Hideharu Hibi; Kiyoshi Sakai; Tomoo Oda; Hisashi Hattori; Minoru Ueda; Masaru Sakai
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Publication Detail:
Type:  Journal Article     Date:  2010-05-13
Journal Detail:
Title:  Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons     Volume:  68     ISSN:  1531-5053     ISO Abbreviation:  J. Oral Maxillofac. Surg.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-19     Completed Date:  2010-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8206428     Medline TA:  J Oral Maxillofac Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1783-7     Citation Subset:  AIM; D; IM    
Copyright Information:
Copyright 2010 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.
Department of Oral and Maxillofacial Surgery, Nagoya University, Graduate School of Medicine, Showa-ku, Nagoya, Japan.
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MeSH Terms
Bone Density
Bone Plates
Bone Screws
Dental Stress Analysis
Open Bite / therapy
Orthodontic Anchorage Procedures / instrumentation*
Orthodontic Appliance Design*
Retrospective Studies
Tooth Movement / instrumentation*
Treatment Outcome
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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