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Comparative Evaluation of the Effect of Different Universal Adhesives and Bonding Techniques on the Marginal Gap of Class I Composite Restoration (A SEM Study)

Authors: Ali F. Al-Qrimli علي القرملي --- Abdulla M.W. Al-Shamma عبد الله محمد وجيه الشماع
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 34-42
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: With the increase in composite material use in posterior teeth, the concerns about the polymerization shrinkage has increased with the concerns about the formation of marginal gaps in the oral cavity environment. New generation of adhesives called universal adhesive have been introduced to the market in order to reduce the technique sensitive bonding procedures to give the advantage of using the bonding system in any etching protocol without compromising the bonding strength. The aim of the study was to study marginal adaptation of two universal adhesives (Single bond™ Universal and Prime and Bond elect) using 3 etching techniques under thermal cycling aging.Materials and Methods: Forty-eight sound maxillary first premolar teeth were included in the study. Teeth were divided into two groups according to the universal adhesive used then each group was subdivided into 3 subgroups according to the etching protocol used. Standardized class I cavities were prepared in the teeth followed by the restoration of teeth using Filtek™ Bulk Fill Posterior Restorative composite material. After finishing and polishing, teeth were subjected to 500 thermal cycles in 55º-5ºC bath with dwell time of 30 seconds. Teeth then were examined using SEM to measure the marginal gap at 12 points. Data obtained were analyzed using one-way ANOVA and LSD test for each group and with student t-test to compare the two adhesives.Results: The result of this study the showed that etch and rinse technique showed significantly the least marginal gap width for both adhesive types. The selective etch technique showed lower gaps compared to the self-etch technique with no significant difference. The result showed that single bond universal showed significantly the least marginal gap for the all etching techniques compared to Prime and bond elect.Conclusion: The etch and rinse technique remains the most suitable technique for adhesive restoration. The type of adhesive plays an important role in adhesion


Article
Early and delayed effect of 2% chlorhexidine on the shear bond strength of composite restorative material to dentin using a total etch adhesive

Authors: Rabeia J. Khalil --- Abdulla M.W. Al-Shamma عبد الله محمد وجيه الشماع
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 2 Pages: 24-31
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Lack of durability of the bond of the dental adhesive systems to tooth structure is one of the mostimportant problems in tooth colored restorative work. This in vitro study was performed to evaluate the effect of 2%chlorhexidine gluconate(CHX) on dentin bond strength by using total etch adhesive system at twenty-four hours andthree months of water storage.Material and methods:A flat dentin surface was prepared for forty sound human maxillary premolar teeth which wereacid etched with 36% phosphoric acid gel after being divided randomly into four groups of ten teeth eachaccording to storage time and CHX application, theCHX was applied for 60 seconds before adhesive application forgroups I and III which were tested after twenty-four hours and three months respectively, while the distal water wasapplied for 60 seconds before the application of adhesive for group II and IV which were tested after twenty-fourhours and three months respectively.The Prime and Bond® NT™ adhesive (Dentsply) was applied and cured,Composite (Ceram X mono, Dentisply) was applied through special mold with 2 mm thickness and light cured, Thenall specimens were stored in distilled water 37oC until the time of testing of each group.Shear bond strength test wasperformed at the end of the storage period (24 hours or 3 months).Results:T-test results showed high statistically significant reduction in shear bond strength (SBS) in non CHX group IV(tested after 3 months) compared to non CHX group II (tested after 24 hours)(P< 0.01). In CHX groups I (tested after24 hours) and III (tested after 3 months), results showed no statistically significant differences in shear bondstrength(p> 0.05).On the other hand result showed statistically no significant differences between groups I and II in 24hours shear bond strength (P> 0.05). After 3 months water storage, there was statistically high significant differencesbetween the groups III and IV (P< 0.01).Conclusion: the use of 2 % CHX glocounate solution after acid etching and before bonding of dentin have noadverse effect on immediate bond strength (24 hours storage), and was effective in reducing degradation of resindentinbond interface after three months of water storage

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