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Article
The Effect of Bleaching Agents on the Shear Bond Strength of Recently Bonded Restorations to Enamel

Author: Manal Hussain Abd-Alla
Journal: Diyala Journal of Medicine مجلة ديالى الطبية ISSN: 97642219 Year: 2015 Volume: 8 Issue: 1 Pages: 14-20
Publisher: Diyala University جامعة ديالى

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Abstract

Background: Fuji II LC, one type of resin-modified glass ionomer cements, has an excellent bonding efficacy to both enamel and dentin. This material is considered the material of choice for treatment of cervical lesions located along the cementoenamel junction.Objectives: To evaluate the effect of post-operative bleaching on the shear bond strength of resin-modified glass ionomer cement to enamel. Methods: Enamel specimens of human molars were bonded with resin-modified glass ionomer (Fuji II LC) and divided into six groups: three control and three bleaching groups. Two bleaching groups were bleached with a 38% hydrogen peroxide either within one hour (B1) or after one week of bonding (B2). The third group (B3) was exposed to a 10% carbamide peroxide bleaching agent for two weeks. Shear bond strength was tested with a universal-testing machine and the data were analyzed by ANOVA test. Results: A significant difference in Shear bond strength was found between the groups (p=0.032). Tukey’s test revealed a significant reduction in the shear bonding strength of B3 compared with the control group (p< 0.05). Conclusions: Post-operative bleaching with 38% hydrogen peroxide did not compromise bonding efficacy to enamel. However, bleaching with 10% carbamide peroxide reduced bonding strength of resin-modified glass ionomer to enamel significantly.


Article
Clinical Evaluation of the Efficacy of 10% Carbamide Peroxide Bleaching Agent Used During Night-Time and Day-Time
تقييم سريري لتاثير استخدام مبيض الاسنان البيتي 10% كاربمايد بيروكسايد خلال الليل اوالنهار

Author: Manal Hussain Abd-alla منال حسين عبدالله
Journal: Al-Rafidain University College For Sciences مجلة كلية الرافدين الجامعة للعلوم ISSN: 16816870 Year: 2016 Issue: 38 Pages: 48-65
Publisher: Rafidain University College كلية الرافدين الجامعة

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Abstract

This split-arch clinical study was performed to compare the effects of using 10% carbamide peroxide bleaching agent for one hour twice a day with its use for 8 hours/night on tooth color change, color stability and sensitivity. Method: Bleaching trays, with reservoirs for the six maxillary anterior teeth, were fabricated for 12 volunteers. The trays were cut into two halves between the left and right central incisors (day-side vs. night-side) to be used with 10% carbamide peroxide for two weeks. The day-side tray was applied for one hour twice a day, while the night-side was applied for 8 hours overnight. Objective color measurements, using a colorimeter, were adopted to measure the color of the teeth of the two sides at the baseline appointment and at 1, 2, 3, 6 and 12 weeks. Total color difference (ΔE*) between two color measurements was calculated for all periods. Teeth and soft-tissue sensitivity were self-recorded for both sides during the bleaching weeks and the following week. Both Student's t-test and Tukey's test were used to compare ΔE* between the two sides and with time at p<0.05. Results: Both sides showed significant differences in ΔE* over time (p<0.05). However, no significant differences were recorded between the two sides at each measuring period (p>0.05). Conclusion: At-home bleaching treatment using 10% carbamide peroxide for one hour twice daily produced similar tooth color change, stability and sensitivity with its use for 8 hours/night.

تبييض الاسنان باستخدام العلاج البيتي باستعمال 10% كاربمايد بيروكسايد لمده 8 ساعات ليلا كل يوم لمدة اسبوعين يعمل على تبيض الاسنان بكقاءه ولكن مثل هذا النوع من النظام العلاجي قد يكون غير مناسب لجميع طالبي الحصول على تبيض امن وسهل الاستخدام.طريقة العمل: تم تطويع 12 متطوع لتطبيق دراسة سريرية لمقارنة استخدام مادة التبيض المذكورة اعلاه لمدة اسبوعين باستخدام نظامين علاجيين مختلفين والمقارنة بينها. تم عمل قوالب التبييض للفك العلوي لجميع المتطوعين ثم تم قطع القالب الى نصفين حيث يتم استخدام احد الانصاف لمدة ساعة واحدة فقط مرتين باليوم اما النصف الاخر يتم استخدامه 8 ساعات ليلا. عملية التغيير في لون اللاسنان للجانبين تم قياسها باستخدام جهاز قياس الالوان قبل البدء بالتبيض وبعد الاسبوع الاول والثاني والثالث والسادس والثاني عشرمن التبييض. كما قام مقيمان مستقلان اثنان بتقييم الجانبين لبيان اذا كان هناك فرق بين الجانبين وتحديد اي منها اكثر بياضا. كماتم تسجيل مقدار حساسية الاسنان في الجانبين من قبل المتطوعين انفسهم.النتائج: اظهرت النتائج وجود فرق مميز في التبيض مع الوقت لكن ليس هناك فرق في التبيض بين الجانبين. كما ليس هناك فرق في كمية حساسية الاسنان في كلا الجانبين.الاستنتاجات: تبيض الاسنان البيتي باستخدام 10% كاربومايد بيروكسايد لمدة ساعة واحدة مرتين باليوم نتج عنه تبيض مشابه لاستخدامه لمدة 8 ساعات ليلا.


Article
Effects of Two Different Colorant Solutions on the Color Stability of Bleached Enamel in Association with CPPACPF: An In Vitro Study

Author: Manal Hussain Abd-alla منال حسين عبدالله
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 2 Pages: 1-6
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: One of the drawbacks of vital teeth bleaching is color stability. The aim of the present study was toevaluate the effects of tea and tomato sauce on the color stability of bleached enamel in association with theapplication of MI Paste Plus (CPP-ACPF).Materials and Methods: Sixty enamel samples were bleached with 10% carbamide peroxide for two weeks thendivided into three groups (A, B and C) of 20 samples each. After bleaching, the samples of each group weresubdivided into two subgroups (n=10). While subgroups A1, B1 and C1 were kept in distilled water, A2, B2, and C2were treated with MI Paste Plus. Then, the samples were immersed in different solutions as follow: A1 and A2 indistilled water (control); B1 and B2 in black tea; and C1 and C2 in tomato sauce for half an hour/day for seven days.Using a colorimeter, Teeth color measurements were recorded at baseline, after bleaching, staining, and polishing.Color changes were recorded according to the Vita shade guide and the CIE Lab system. Student's t-test was usedto analyze differences between the subgroups at p<0.05.Results: Significant color changes were recorded for the tea group after staining, but not after polishing (p<0.05). Nosignificant differences in color measurements were recorded between the subgroups of each group at all periods(p>0.05).Conclusion: Only tea produced clinically perceivable color change of bleached enamel after staining as well asafter polishing. MI Paste Plus did not affect enamel color change for all the groups.


Article
In Vitro Evaluation of the Efficacy of Two Different At-home Bleaching Agents: Solo or Combined
تقييم مختبري لكفاءة نوعين مختلفين من مواد تبييض الاسنان البيتي: مفردة او مشتركة

Authors: Manal Hussain Abd-alla م.د. منال حسين عبد الله1 --- Huda Ahmed Abdullah م.م. هدى احمد عبد الله
Journal: Diyala Journal of Medicine مجلة ديالى الطبية ISSN: 97642219 Year: 2016 Volume: 10 Issue: 2 Pages: 55-62
Publisher: Diyala University جامعة ديالى

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Abstract

Background: Combining at-home and in-office vital teeth bleaching techniques has proven to be effective; however, the efficacy of combining at-home bleaching agents is still unclear. Objective: To compare the effectiveness of 10% and 35% carbamide peroxide at-home bleaching agents solo or in combination.Materials and Methods: Forty enamel samples from human premolars were divided into four groups (n=10) to receive different at-home bleaching protocols. The samples were bleached for two weeks as follow: G1 bleached with 10%CP for 8h/day; G2 bleached with 35%CP for 30 minutes/day; G3 starting with 35%CP for three days and continue with 10%CP for the last 11 days; and G4 bleached with 10%CP for the first 11 days and with 35%CP for the last three days. Teeth color measurements were recorded by a colorimeter in reference to the CIE L*a*b* at different periods. Student's t-test was used to compare between the groups at each measuring period.Results: No significant differences were seen among the four groups neither in ΔE*1& ΔE*2 nor in ΔE*6 (p>0.05).Conclusion: Both 10% and 35%CP, used for two weeks, were effective in teeth whitening. Compared with 10% CP, combination treatments whether starting with 35% CP or ending with it produced no significant difference in teeth whitening during the treatment or one month post operatively.

خلفية الدراسة: : اصبح تبييض الاسنان باستخدام تقنية مزج التبييض في عيادة طبيب الاسنان مع التبييض البيتي من الوسائل المؤثرة والفعالة في تبييض الاسنان المتلونه الحية ولكن حتى الان لم بتم بحث تاثير استخدام مادة التبييض البيتي العالية التركيز مفردة او مع تركيز قليل على فعالية التبييض اهداف الدراسة: لتقييم تأثير تركيزين مختلفين (10% و 35%) كارباميد بيروكسيد من مواد تبيض الاسنان البيتي مفردة او مشتركة على تبييض الاسنان الحية.المواد وطرائق العمل : نماذج من مينا الاسنان مقتطعة من اسنان مقلوعة قسمت الى اربع مجموعات. تم تبييضها لمدة اسبوعين كالتالي : G1و G2باستخدام 10% و 35% كارباميد بيروكسيد منفرده. لكن G3 و G4 تم مزج التركيزين اما استخدام 35% اولا لمدة 3 ايام ثم تكملة العلاج مع 10% او بالعكس. تم قياس التغيير في لون الاسنان قبل , اثناء ,عند اكتمال العلاج وبعد الانتهاء منه باستخدام جهاز خاص لقياس L*a*b*)) ومن ثم قياس مجموع التغيير(ΔE)النتائج: لم يتم العثور على اختلاف في ΔE لا اثناء العلاج ولا بعد 4 اسابيع منه (p>0.05). الاستنتاجات: ستخدام 35٪ كارباميد بيروكسيد مفردا او مشتركا مع 10 % نتج عنه تبييض اسنان مقارب مع 10 % كارباميد بيروكسيد سواء اثناء العلاج او بعده.


Article
Effect of Home Bleaching on Surface Roughness of Novel Composite Resins Subjected to One Step Polishing System: An In Vitro Study

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Abstract

The aims of this in vitro study was to evaluate surface roughness (Ra) of fourcontemporary composite resin materials after applying home bleaching agent.Materials and Methods: Forty-eight composite specimens were made from fourgroups of different types composite resins (one-submicron hybrid, onemicrohybrid and two nanohybrid) of 12 specimens each: Group 1: BrilliantEverGlow, group 2: G-ænial from GC, group 3: Evetric and group 4: Ice, SDI. Allthe samples were polished with one step polishing system OptraPol. Each groupwas further subdivided into two subgroups (A&B) (n=6). Subgroups A werestored in distilled water as control, while subgroups B were bleached with 20%carbamide peroxide home bleaching agent for 14 day. Surface roughness analysiswas then performed for all the samples using atomic force microscopy (AFM).Results were statistically analyzed using One-way ANOVA/LSD test analyzingthe differences between the subgroups at p<0.05.Results: Surface roughness of all the groups increased after bleaching; however, LSDtest showed significant differences that were only recorded between the subgroupsof groups 3 & 4.Conclusion: 20% at-home bleaching treatment significantly affected surfaceroughness of both nanohybrid composite groups, while, it did not produce asignificant surface changes for microhybrid and submicron composite resin

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