Abstract：
:The purpose of this study was to assess quantitatively the roughness of the enamel surface following debonding using two resin removal methods. The enamel surface of 30 premolar crowns was covered with black tape with a 3 mm window on the middle buccal third to standardize the area of analysis. The initial enamel surfaces were subjected to profilometry, registering four roughness parameters (Ra, Rq, Rt and Rz). The brackets were bonded to the plaster-embedded enamel surfaces with a chemically cured, no-mix adhesive, and debonded after 1 week. Resin removal in half of the specimens was performed with an eight-bladed carbide bur, and in the other half with an ultra-fine diamond bur, both attached to a high speed hand piece; a second profilometric measurement was made after resin removal. Finishing of all surfaces was achieved with Soflex discs and a third registration of roughness followed. The duration of each resin removal protocol was also recorded. The results were analysed with two-way ANOVA and the Newman-Keuls test with the two resin grinding modes and the three intervals serving as discriminating variables (n = 15). For the duration results, a one-way ANOVA was used. Significant differences (P < 0.05) were observed with respect to enamel roughness parameters between the two resin grinding methods used, while there was no consistent roughness-reducing effect of finishing with Soflex discs. Resin removal with a diamond bur was achieved in approximately half the time compared with the eight-bladed bur. The increase in most roughness variables induced by the debonding procedures was not reversed at the end of the finishing stage, regardless of the resin removal protocol used, suggesting an irreversible effect on enamel texture.
journal_name
Eur J Orthodjournal_title
European journal of orthodonticsauthors
Eliades T,Gioka C,Eliades G,Makou Mdoi
10.1093/ejo/26.3.333keywords:
subject
Has Abstractpub_date
2004-06-01 00:00:00pages
333-8issue
3eissn
0141-5387issn
1460-2210journal_volume
26pub_type
杂志文章abstract：:In order to study the prevalence of mandibular dysfunction in orthodontically treated prognathic patients after retention, 60 randomly selected patients were examined clinically. The functional status of the patients was evaluated using the anamnestic, clinical dysfunction index, and the index for occlusal status intr...
journal_title：European journal of orthodontics
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更新日期：1991-04-01 00:00:00
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更新日期：1996-04-01 00:00:00
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更新日期：1999-06-01 00:00:00
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更新日期：1990-08-01 00:00:00
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journal_title：European journal of orthodontics
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更新日期：1994-08-01 00:00:00
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更新日期：1997-06-01 00:00:00
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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：1996-02-01 00:00:00
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pub_type： 杂志文章,随机对照试验
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更新日期：2012-08-01 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：2009-10-01 00:00:00
abstract：:Corrosion of orthodontic miniscrews or temporary anchorage devices (TADs) has been proposed as a contributor to inflammation, which in turn is a factor in the clinical success of miniscrews. The purpose of this study was to measure the electrochemical properties of orthodontic miniscrews in artificial saliva with and ...
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更新日期：2013-08-01 00:00:00
