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An evaluation of the effect of retention means on increasing the debonding strength of the denture acrylic teeth attached to the denture base resin

Author: Abbas F. Al-Huwaizi عباس فيصل الحويزي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 1 Pages: 14-17
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The debonding of acrylic teeth from the denture base is a challenging problem to the dentist and dental technician in which special means must be done to increase the debonding strength of the tooth.Material and method: Sixty specimens of acrylic central incisors were attached to acrylic rods and grouped into 5 groups according to the shape of the retention means placed at the tooth ridge lap. The specimens were strained under tension to examine their debonding strength.Results: The teeth with serrations (Group 2) have shown to be the most effective mean of increasing debonding strength, followed by the 2 longitudinal grooves (Group 4) where the difference between these groups was insignificant. Then followed by the teeth with 4 holes, and finally the difference between the teeth with a central groove and the control group were insignificant.Conclusions: It is recommended that the tooth ridge lap should be serrated with a fissure groove or placement of the 4 grooves to increase the debonding strength of the tooth.


Article
Evaluation of enamel surface damage after debonding using three different pliers "An in vitro study"

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Abstract

AbstractThis study aims to compare the effectiveness of three different pliers in debondingstainless steel and ceramic brackets, also to evaluate enamel surface damage and thesite of bond failure after debonding.Sixty premolars, extracted for orthodontic purposes, were divided into 3 groups of20. The enamel surfaces were examined with 10X magnifying lens. Two types ofbracket (stainless steel and ceramic) was bonded and debonded in each group using:conventional debonding pliers, bracket removal pliers, and ligature wire cutter. Afterdebonding, the enamel surfaces were inspected under a stereomicroscope to determinethe predominant site of bond failure. Then stereomicroscope was used to evaluateenamel surface damage after the removal of residual adhesive.The enamel surface damage showed a statistically significant difference in ceramicbracket groups, whereas, it was statistically insignificant in stainless steel bracketgroups. The amount of the adhesive remained on the tooth surface was statisticallyinsignificant in both stainless steel and ceramic bracket groups. The predominantfailure site was within the adhesive itself for both types of brackets.The enamel surface damage that results from debonding of ceramic brackets washigher than that found with the stainless steel brackets especially with the use ofbracket removal pliers "used in this study"


Article
Evaluation of water atomized solid-state laser apparatus as a method for debonding ceramic orthodontic brackets (An In vitro study)

Author: Dr. Omar Fawzi Abduljabbar Chawshli, BDS, MSc, PhD د.عمر فوزي عبد الجبار
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2018 Volume: 15 Issue: 1 Pages: 69-76
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background and objectives: The contemporary demand for esthetic less visibleceramic bracket is associated with the disadvantage of complicated and difficultdebonding procedure at the end of the treatment. The aim of this study was toevaluate the water atomized laser system for debonding ceramic brackets.Method: Eighty maxillary premolars were divided into two main groups. In group-1,poly crystalline ceramic brackets (Reflections, Ortho technology, USA) werebonded to buccal enamel surface. In group-2, mono crystalline ceramic brackets(PURE, Ortho Technology USA). Were bonded to buccal enamel surface. Forall teeth, the same bracket bonding system was used. Following debonding withboth water atomized laser device and manual debonding instrument, teeth andbrackets were examined under 10X magnification for assessment of bracketfailure (fracture) and of residual adhesive on the enamel surface using amodified adhesive remnant index (ARI). Enamel surfaces were visualized withtrans-illumination prior to bonding and after removal of the residual adhesive, sothe effect of the debonding forces could be determined. The numbers of thefractured brackets were counted.Results: Statistical analysis showed a significant difference in the ARI betweendebonding with water atomized laser and utility-debonding pliers in such awaymore adhesive remnant was revealed on teeth with laser debonding. Also lessenamel damage recorder with laser group debonding compared withconventional debonding procedure, which was statistically significant,additionally more bracket fractures encountered with conventional debondingthan debonding with laser apparatus, which was highly significant statistically.Conclusions: Debonding of ceramic orthodontic brackets could be done with wateratomized laser apparatus with minimal enamel surface cracks and lesser chanceof bracket fractures.

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