Enamel cracks and ceramic bracket failure during debonding in vitro

Samir E Bishara; Adam Wade Ostby; John Laffoon; John J Warren

doi:10.2319/112007-540.1

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Enamel cracks and ceramic bracket failure during debonding in vitro

Journal article

Open access

Peer reviewed

Enamel cracks and ceramic bracket failure during debonding in vitro

Samir E Bishara, Adam Wade Ostby, John Laffoon and John J Warren

The Angle orthodontist, Vol.78(6), pp.1078-1083

11/2008

DOI: 10.2319/112007-540.1

PMID: 18947289

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Abstract

To test the null hypothesis that no difference in bracket failure characteristics is noted when use of a new ceramic bracket debonding instrument is compared with the use of conventional pliers. Thirty maxillary premolars were randomly assigned to one of two groups. In group 1, Clarity collapsible ceramic brackets (3M Unitek, Monrovia, Calif) were debonded with the use of conventional Utility/Weingart (3M Unitek, Monrovia, Calif) pliers. In group 2, Clarity brackets were debonded with a new Debonding Instrument (3M Unitek). For all teeth, the same bracket bonding system was used. Following debonding, teeth and brackets were examined under 10x magnification for assessment of bracket failure (fracture) and of residual adhesive on the enamel surface. Enamel surfaces were visualized with transillumination prior to bonding and after removal of the residual adhesive, so the effect of the debonding forces could be determined. The results of Adhesive Remnant Index comparisons indicated that a statistically significant difference (chi2 = 8.73; P = .013) in bond failure patterns was apparent when the two groups were compared. Brackets debonded with the new instrument showed a greater tendency for the adhesive to be removed from the tooth during debonding. The hypothesis is rejected. Although the incidence of enamel damage following debonding was similar in the two groups, the use of the new Debonding Instrument decreased the incidence of bracket fracture.

Materials Testing

Temperature

Bicuspid

Dental Enamel - injuries

Humans

Resin Cements - chemistry

Dental Enamel - pathology

Dental Debonding - instrumentation

Dental Debonding - methods

Orthodontic Brackets

Ceramics - chemistry

Dental Materials - chemistry

Time Factors

Surface Properties

Water - chemistry

Light-Curing of Dental Adhesives

Equipment Failure

Transillumination

Details

Title: Subtitle: Enamel cracks and ceramic bracket failure during debonding in vitro
Creators: Samir E Bishara - Orthodontic Department, College of Dentistry, University of Iowa, Iowa City, IA 52242, USA. samir-bishara@uiowa.edu
Adam Wade Ostby
John Laffoon
John J Warren
Resource Type: Journal article
Publication Details: The Angle orthodontist, Vol.78(6), pp.1078-1083
Publisher: United States
DOI: 10.2319/112007-540.1
PMID: 18947289
ISSN: 0003-3219
eISSN: 1945-7103
Language: English
Date published: 11/2008
Academic Unit: Preventive and Community Dentistry
Record Identifier: 9983917780702771

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