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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
Enamel surface damage after Use of self-etched Flowable composite and conventional orthodontic bonding systems "An in vitro study"
ضرر سطح المينا بعد استعمال الرابط المائع ذاتي اللصق وأنظمة الربط لتقويم الأسنان التقليدية "دراسة في المختبر

Author: Rawof R. Al-Tuma رؤوف رشيد جواد ال طعمة
Journal: karbala journal of pharmaceutical sciences مجلة كربلاء للعلوم الصيدلانية ISSN: 70272221 Year: 2016 Issue: 11 Pages: 116-123
Publisher: Kerbala University جامعة كربلاء

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Abstract

Background: This study aims to evaluate enamel surface damage and the site of bond failure afterusing of two materials with each has different adhesive techniques. One of them is self-etch (7thgeneration bonding system) while the other with three steps conventional technique(5th generationbonding system).Materials and methods: eighty premolars, extracted for orthodontic purposes, were divided into 4groups of 20. The enamel surfaces were examined with 10X magnifying lens. Two types ofbracket (stainless steel and ceramic) was bonded and debonded in each group using ligature wirecutter. The three steps adhesives was conventional orthodontic bracket adhesive of Oromcocompany, the self-etch flowable adhesive was Vertise flow flowable composite of Kerr company;After debonding, the enamel surfaces were inspected under a stereomicroscope to determine thepredominant site of bond failure and adhesive remnant index. Then stereomicroscope was used toevaluate enamel surface damage after the removal of residual adhesive.Results: The reduction in enamel surface damage showed a statistically non-significant with theuse of self-etched flowable adhesive in both ceramic and stainless steel brackets groups. Theamount of the adhesive remained on the tooth surface significantly increase for groups thatbonded with self-etched flowable adhesive in both stainless steel and ceramic brackets. Thepredominant failure site in self-etch flowable adhesive was between enamel and bracket for bothtypes of brackets.Conclusion: The enamel surface damage that results from debonding of conventional orthodonticadhesives was non significantly higher than that found with self-etch flowable adhesive for bothmetal and ceramic brackets "used in this study"

تهدف هذه الدراسة إلى تقييم أضرار المينا السطحية وموقع من فشل السندات بعد استخدام اثنين من المواد مع بعضها لديهاتقنيات لاصقة مختلفة .واحد منهم هو اللصق الذاتي نظام الربط جيل في حين أن الآخر مع ثلاث خطوات (تقنية التقليدية )10 عدسة X ثمانون سن ضاحك مقلوعة لأغراض تقويم الأسنان، تم تقسيمهم إلى 4مجموعات . تم فحص السطوح المينا معمكبرة . مع استخدام نوعين من سنادات التقويم (الفولاذ المقاوم للصدأ والسيراميك) . اللواصق المستخدمة كانت اللاصق التقليديبعد رفع الروابط، تم تفتيش السطوح المينا باستخدام المجهر ؛Kerr والاصق الذاتي المائع لشركة ،Ormco لتقويم من شركةلتحديد موقع فشل السندات والبقايا اللاصقة ثم تقييم ضرر المينا بعد إزالة اللواصق المتبقية

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