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Article
An in vitro comparative evaluation of microleakage in open sandwich technique in Class V restoration (A dye penetration study)

Author: Alaa J. Khadhim الاء كاظم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The purpose of this in vitro study was to compare the microleakage at dentin margins of class V cavitiesfilled with compomer alone and compomer lined with conventional glass ionomer cement or resin modified glassionomer cement.Materials and Methods: fifteen recently extracted human premolars were prepared with standardized box shapedclass V cavities of 3.0 mm (mesial-distal), 2.0 mm (occlusal-gingival), and 2.0 mm depth with margins located onenamel and dentin/cementum on the buccal or lingual surfaces. The cavities were randomly assignedinto threegroups (n=10): Group I –compomer Dyract extraDetsply DetryGmbH (control); Group II – compomer DyractextraDetsply DetryGmbH lined with conventional GIC (promedica Medifil). Group III – compomer Dyract extraDetsply DetryGmbH lined with RMGIC (3M ESPE Vtrebond). After being immersed in tap water for 24 h, the specimenswere thermocycled (500 cycles, 5°-55°C, 30 sec dwell time) and immersed in a 0.5% basic fuchsine solution for 24 h.The restorations were sectioned longitudinally and gingival margins were evaluated for microleakage using a 0-4scale. Data were subjected to the Kruskal-Wallis test and Mann-Whitney U tests at p<0.05.Results: a statistically significant difference among groups was observed. The RMGIC show the less gingivalmicroleakage while the conventional GIC show the most microleakage.Conclusion: The use of a RMGIC liner under composite in open sandwich technique minimizes the gingival microleakage, while the conventional GIC exhited the contrary.


Article
The Effects of Acetic Acid and Chlorhexidine Gluconate as a Cavity Cleanser on the Shear Bond Strength of Compomer Restorations

Author: Dr. Raghad A. Mohammed.B.D.S, M.Sc.* د.رغد محمد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2009 Volume: 6 Issue: 1 Pages: 28-31
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Bonding of restorative materials to tooth structure has become one of the prime objectives of modern dentistry. The purpose of this in vitro study was to evaluate andcompare the shear bond strength of compomer material to dentin washed with three cleanser agent. Thirty freshly extracted adult human maxillary firs,, premolars teeth were utilized in this study. Each tooth was sectioned horizontally exposing the dentin surface. According to the type of cleanser agent used to wash the dentin surface; the teeth were divided into three groups often teeth each: Group I chlorhexidine cleanser with compomer; Group II acetic acid with compomer; and Group III distal water with compomer. The measurement for evaluation the shear bond strength of compomer to dentin by using Zwick universal testing machine. The results showed that higher significant different between group I and group III also between group II and group III; however< there is no significant difference between group I and group II. This present in vitro study concludes that the shear bond strength of compomer material to dentin can be enhanced by washing the exposed dentin with cleanser agents chlorhexidine and acetic acid instead of distal water.


Article
A comparative study evaluating the microleakage of different types of restorative materials used in restoration of pulpotomized primary molars

Authors: Zainab A. Al-Dahan زينب الدهان --- Aseel I. Al- Attar اسيل العطار --- Huda E.A. Al-Rubaee هدى الربيعي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 2 Pages: 150-154
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Possibly the greatest deterrent to the development of an ideal restorative material is the leakage thatoccurs along the restoration, tooth interface. There is yet no truly adhesive dental material that exactly duplicatesphysical properties of the tooth structure. This in vitro study was carried out to compare the microleakage of twotypes of restorative materials used in pediatric dentistry Colored light curing compomer(Twinky star) and nanoceramic restorative material (Ceram.x)) with that of amalgam by measuring their ability to prevent dye penetration.Materials and Methods: Standardized Proximo-occlusal cavity preparations were prepared in 30 extracted soundprimary first lower molars. Pulpotomy was performed, and pulpotomy paste filled the pulp chamber with hard settingcement over it all have same occlusal depth. The teeth were then randomly divided into three groups: Group A:filled with Amalgam. Group B: filled with compomer (Twinky star). Group C: filled with nano ceramic (Ceram.x).After that the teeth were stored in distilled water for 30 days at 37 °C in an incubator and during the period of storagethe teeth were subjected to 300 thermal cycles (10 cycles each day), then sectioned to be examined under thestereo microscope.Results: Data was analyzed using ANOVA test with help of spss soft ware, even though nano ceramic (Ceram. X)showed higher resistance to dye penetration, when compared to compomer (Twinky star and amalgam), therewere no significant differences between the three studied groups in their resistance to dye penetration.Conclusion: Depending on the ability to prevent marginal leakage, nano ceramic (ceram.x) and compomer (Twinkystar) restorative materials can be used as an alternative to amalgam in restoring pulpotomized primary teeth

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