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Article
Surface changes of orthodontic brackets following treatment with fixed orthodontic appliances

Authors: Harith M. Abdulrasool حارث عبد الرسول --- Ahmed D. Hassan احمد حسن
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 1 Pages: 96-100
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Fixed orthodontic appliances were used for long period in the treatment of malocclusion patients. It is subjected to the oral environment and affected by the changes that take place in this media. Many studies were done and express the tendency of these appliances to corrode inside the mouth.Materials and method: 150 orthodontic brackets related to three different companies (Orthodent, Ortho-organizers, and Dentaurum). These brackets examined after removing them from the patients' mouth and examined microscopically.Results: Most of the brackets exhibit corrosion which is mainly pitting, crevice and erosion corrosion


Article
Surface changes of orthodontic brackets following treatment with fixed orthodontic appliances

Authors: Dr. Abeer B.Mahmoud M.Sc. B.D.S د. عبير محمود --- Dr. Shahba’a A. Mohammed M.Sc. B.D.S د.شهباء محمود
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2009 Volume: 6 Issue: 2 Pages: 145-151
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Fixed orthodontic appliances were used for long period in the treatment of malocclusion patients. It is subjected to the oral environment and affected by the changes that take place in this media. Many studies were done and express the tendency of these appliances to corrode inside the mouth. 150 orthodontic brackets related to three different companies (Orthodent, Ortho-organizers, and Dentaurum). These brackets examined after removing them from the patients' mouth and examined microscopically. Most of the brackets exhibit corrosion which is mainly pitting, crevice and erosion corrosion.


Article
Effect of Enamel Resin-Removal Methods on Tensile Bond Strength of Rebonded New Brackets

Author: Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 21 Pages: 176-183
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The objective of this study is to determine (1) the effect of different resin-removal methods on tensile bond strength (TBS) of rebonded new brackets (2) compare various methods of enamel resin-removal to define the best method that produces adequate bond strength (3) to compare the bond strength of newly bonded enamel (virgin enamel) with previously bonded enamel after resin removal from the enamel surface with different methods. Materials and Methods: Seventy human premolars were bonded with stainless steel new brackets, then the teeth were randomly assigned in to 7 groups, each group of 10 teeth. Group1 (control group) where TBS at the first debonding was evaluated (initial bond). Group2 brackets were debonded by bracket removal plier and the remnant adhesive removed by high-speed tungsten carbide bur (TCB) and rebonded with brackets as in initial bond, then the TBS were tested. Group3 as with group2 except that the remaining resin were removed by low-speed TCB . Group 4 as with group2 except that the remaining resin were removed by Diamond carbide Disk . Group 5 as with group2 except that the remaining resin were removed by a microetcher, Group 6 as with group 2 except that the remaining resin were removed manually by composite removing pliers, Group 7 as with group6 except that rebonding bracket without cleaning enamel with rubber cup and pumice. Results: All rotary instrument groups (G2, G3 and G4) showed significant increase in the TBS in comparing with the other groups (G1, G5, G6 and G7) also there were significant decrease in the TBS of the manually removal of adhesive remnant groups in comparing with control group, while there were no significant differences between microetcher group and control group with greater mean value for control group. Conclusions: The outcomes of this study showed that the use of the rotary instrument in the removal of adhesive remnant gives the highest tensile bond strength in compared with the other methods used in this study .


Article
In Vitro Evaluation of Shear Bond Strength of Sapphire Brackets after Dental Bleaching

Author: Zainab M. Kadhom زينب موسى كاظم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 1 Pages: 158-163
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The present study was conducted to evaluate the effects of different bleaching methods on the shearbond strength of orthodontic Sapphire brackets bonded to human premolars teeth using light cured composite resinand to determine the predominant site of bond failure.Materials and Methods: Thirty freshly extracted human premolars were selected and randomly divided into threegroups (10 per group). These groups are: control (unbleached) group, hydrogen peroxide group (HP) 37.5% ; which isthe in- office bleaching method group, carbamide peroxide group (CP) 16%; which is the at- home bleachingmethod group. After bleaching process was performed, all the teeth stored in distilled water in a sealed container atroom temperature for 24 hours before bonding was initiated, then orthodontic brackets were bonded with a lightcure composite resin, stored in distilled water at room temperature for another 24 hours before debonding then thebrackets de-bonded and tested for shear bond strength using an Instron universal testing machine. For adhesiveremnant index (ARI) the enamel surface and bracket base of each tooth were inspected under magnifying lens(20X) of a stereomicroscope.Results and Conclusions: Non-statistically significant differences of shear bond strengths were found between thecontrol group and the bleached groups, the dental bleaching in both methods did not affect the SBS of Sapphirebrackets. The mode of failure was mostly between the adhesive and the enamel and the bond failure between thebracket base and the adhesive were also observed

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