Abstract:
:This clinical study investigated the practical value of two methods for debonding brackets attached by the adhesive Concise to acid-etched enamel surfaces. Forty-two Ultratrimm Standard metal brackets and 42 Fascination ceramic brackets were collected from juvenile patients undergoing orthodontic treatment. All metal brackets were mechanically debonded by a conventional bracket removal plier, whereas the ceramic brackets were thermally debonded by a commercial Dentaurum ceramic debonding unit. All brackets were evaluated by scanning electron microscopy for the morphology of their adhesive fracture surfaces and for the occurrence of mineral-like particles attached to the adhesive fracture surfaces. These particles were analysed by an energy dispersive X-ray microprobe for their Ca/P ratios and by image analysis of scanning electron micrographs for measurement of their areas. The scanning electron micrographs showed 4 types of debonding fractures. The most frequent fracture was type 1 (between adhesive and bracket base) and type 2 (between adhesive and enamel surface). In the group of mechanically debonded metal brackets type 1 (38 per cent) and type 2 (45 per cent) showed a similar frequency, whereas thermally debonded ceramic brackets predominantly showed fracture type 1 (79 per cent) and only a minor percentage of type 2 (11 per cent). A statistical evaluation was applied to estimate the range of reproducibility of fracture types with a 95 per cent confidence interval (level of significance alpha = 5 per cent). In both groups the microprobe analysis of fracture surfaces lying completely or partly between adhesive and enamel surface identified the mineral-like particles as enamel mineral. They occurred partly as single particles (range of thickness: 5-25 microns, mean area: 3500 microns2) and partly as a coherent covering with a total area of 1.9-5.8 mm2. It is concluded that the thermodebonding technique is superior to conventional mechanical debonding, because the frequent occurrence of fracture type 1 after thermodebonding affords a protection for the enamel surface, whereas mechanical debonding entails a comparatively high risk of enamel fractures.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Stratmann U,Schaarschmidt K,Wegener H,Ehmer Udoi
10.1093/ejo/18.6.655subject
Has Abstractpub_date
1996-12-01 00:00:00pages
655-62issue
6eissn
0141-5387issn
1460-2210journal_volume
18pub_type
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journal_title:European journal of orthodontics
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doi:10.1093/ejo/cjy034
更新日期:2019-03-29 00:00:00
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journal_title:European journal of orthodontics
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doi:10.1093/ejo/cjq107
更新日期:2011-10-01 00:00:00
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更新日期:2019-03-29 00:00:00
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更新日期:2009-06-01 00:00:00
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更新日期:2010-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:1999-10-01 00:00:00
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更新日期:2013-08-01 00:00:00
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更新日期:2008-02-01 00:00:00
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pub_type: 杂志文章
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更新日期:2018-11-30 00:00:00
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更新日期:2019-03-29 00:00:00
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journal_title:European journal of orthodontics
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更新日期:2012-02-01 00:00:00
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更新日期:2014-02-01 00:00:00
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pub_type: 评论,杂志文章
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更新日期:2013-04-01 00:00:00
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journal_title:European journal of orthodontics
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更新日期:2017-10-01 00:00:00
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更新日期:2013-02-01 00:00:00
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更新日期:2006-12-01 00:00:00
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更新日期:2020-12-26 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:1989-05-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2002-10-01 00:00:00
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pub_type: 杂志文章
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2011-08-01 00:00:00
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journal_title:European journal of orthodontics
pub_type: 杂志文章
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更新日期:2009-08-01 00:00:00
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pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00