Abstract：
Objective:The aim of this in vitro study was to evaluate the progressive development of surface microdamage produced following the insertion of orthodontic miniscrews (OMs) into 1.5 mm thick porcine tibia bone using maximum insertion torque values of 12 Ncm, 18 Ncm, and 24 Ncm. Methods:Aarhus OMs (diameter 1.5 mm; length 6 mm) were inserted into 1.5 mm porcine bone using a torque limiting hand screwdriver set at 12 Ncm, 18 Ncm, and 24 Ncm. A custom rig equipped with a compression load cell was used to record the compression force exerted during manual insertion. A sequential staining technique was used to identify microdamage viewed under laser confocal microscopy. Virtual slices were created and stitched together to form a compressed two-dimensional composition of the microdamage. Histomorphometric parameters, including total damage area, diffuse damage area, maximum crack length, maximum damage radius, and maximum diffuse damage radius, were measured. Kruskal-Wallis Tests and Wilcoxon Rank-Sum Tests were used to analyse the generated data. Results:All OMs inserted using 12 Ncm failed to insert completely, while partial insertion was observed for two OMs inserted at 18 Ncm. Complete insertion was achieved for all OMs inserted at 24 Ncm. Histomorphometrically, OMs inserted using 24 Ncm produced a significantly larger diffuse damage area (P < 0.05; P < 0.05) and maximum diffuse damage radius (P < 0.05; P < 0.05), for both the entry and exit surfaces, respectively, compared with the 12 Ncm and 18 Ncm groups. Conclusions:Insertion torque can influence the degree of OM insertion and, subsequently, the amount of microdamage formed following insertion into 1.5 mm thick porcine tibia bone. An increase in insertion torque corresponds with greater insertion depth and larger amounts of microdamage.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Nguyen MV,Codrington J,Fletcher L,Dreyer CW,Sampson WJdoi
10.1093/ejo/cjx026subject
Has Abstractpub_date
2018-01-23 00:00:00pages
37-44issue
1eissn
0141-5387issn
1460-2210pii
3752442journal_volume
40pub_type
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
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journal_title：European journal of orthodontics
pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：2000-06-01 00:00:00
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更新日期：1992-04-01 00:00:00
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