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Article
Evaluation of Microleakage of Soft Liners to Highly Impact Acrylic Resin

Authors: Ammar Kh Al- Noori --- Hala M Al-Kateb
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 2 Pages: 378-385
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluat the microleakage of four types of soft Liners materials(Vertex, Molloplast B, Bony plus and Silicon promedica) with different surface treatment: acetone, monomer, and laser at different period of storage to highly impact acrylic resin. Materials and Methods: Two hundred and forty spe-cimens for microleakage have been prepared , each specimens consists of two parts: acrylic resin den-ture base part (30mm) diameter , ( 2mm) thickness of acrylic resin and (30mm) diameter, (2mm) thik-ness of soft liners. Soft denture liners bonded to three different groups of surface treatment: acetone, monomer, laser treated to denture base resin. Microleakage specimens underwent three aging proce-dures: storage at one week, one month without thermocyling and one month with thermocyling inside 2% methylen blue dye in 600 cycles. Results: The results showed that microleakage of Vertex and Molloplast_B in one week and in one month without thermocyling were the lowest value from the oth-er types , in one month with thermocyling the vertex was the lowest of microleakage than oth-ers.Treating the surface of denture bases with acetone and monomer had the highest value of microlea-kage from other types of surface treatment in one week ,while in one month without thermocyling and one month with thermocycle, there were no significant difference in microleakage among the the dif-ferent types of surface treatment of acrylic resin Conclusions: Permanent soft liner of acrylic type (ver-tex) had the lowest values of microleakage after different periods of storage and thermocyling .

Keywords

soft liner --- microleakage --- acetone


Article
Microleakage of Pit and Fissure Sealants after Using Different Occlusal Surface Preparation Techniques: An In Vitro Study

Author: Nibal Mohammed Hoobi نبال محمد هوبي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 3 Pages: 172-177
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The marginal seal is essential for sealant success because penetration of bacteria under the sealantmight allow caries onset or progression. The aim of the present study was to estimate and compare themicroleakage of pit and fissure sealant after various methods of occlusal surface preparation.Materials and methods: Thirty non-carious premolars extracted for orthodontic reasons were equally divided intothree groups. In group one, occlusal fissures were opened with round carbide bur, in group two, occlusal surfaces ofthe teeth were cleaned with a dry pointed bristle brush and samples of group three were cleaned with a slurry of fineflour of pumice in water using rubber cup. Then fissures of all teeth were etched using 35% phosphoric acid gel priorto placement of Conseal F (SDI) light cured sealant, the teeth were thermocycled, then they were immersed in 1%methylene blue for 24hours. Each tooth was sectioned bucco-lingually to detect the microleakage.Results: Different levels of microleakage were observed among various groups, highest level was recorded forbrushing group followed by pumice group, while round bur samples showed the least microleakage whencompared with other groups. Statistically the difference was not significant between brushing and pumice groups,while it was significant between round bur and other groupsConclusion: Preparation of occlusal surface with round bur was very effective in reduction of microleakage incomparison with the traditional pumice slurry and bristle brush.


Article
Influence of Adhesive Systems on Microleakage Pattern of Composite Resin Restorations

Authors: Eman A Abdulkadir --- Ma´an M Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 3 Pages: 547-554
Publisher: Mosul University جامعة الموصل

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Abstract

Microleakage is important for assessing the success of adhesive restorative materials. The aim of this study was to evaluate the microleakage of resin composite restorations bonded with three types of adhesive systems. MATERIALS AND METHODS: Twenty four sound human third molars were used. Class V cavities were prepared on the buccal surface by a diamond cylinder bur No. (1543M). Samples was assigned randomly to three groups (N = 8): Group Ι: Cavities were treated with total etch adhesive system (Adper Single Bond 2Adhesive, 3M ESPE, USA). Group II: Cavities are treated with one step self-etch adhesive system (OptiBond All In One, kerr, USA). Group III: Cavities were treated with two step self-etch adhesive system (CLEARFIL SE BOND, kurary, Japan). Cavities were restored in bulk technique withresin composite (Ceram X, DENTSPLY, USA). Restorations were polished and after storage in water for 24 hours at 37°C the samples were thermocycled between 5-50°C for 300 cycles in water baths then immersed in methylene blue solution for 24 hours. Dye leakage was assessed by examining longitudinal sections in a stereomicroscope at X10magnification. Data were analyzed with Kruskal-Wallis test and Mann-Whitney test at 5%significant level. RESULTS: A significant differences in microleakage were observed among restorations (p < 0.05).One step adhesive bonded restorations demonstrate significantly higher leakage value than two step. No significant differences were observed between total etch adhesive and self-etch adhesive (p>0.05).CONCLUSIONS: The microleakage of resin composite restoration was influenced by adhesive type. One step self-etch bonded restoration was more prone to leakage than total etch and two step bonded restoration


Article
An in vitromicroleakage study on a new dental amalgam alloy

Author: Manar M AL-NE,MA
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2002 Volume: 2 Issue: 2 Pages: 231-235
Publisher: Mosul University جامعة الموصل

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Abstract

This study was done to evaluate themicroleakage of a new dental amalgam alloy called Al-Rafidain and compare it with an already experimented and known alloy called Dcgussa by using the dye penetration technique (0.5% methylene blue) after (10) days of storage, results of microleakage revealed no significant difference between restorations of the Degussa alloy and that of Al-Rafidain alloy.


Article
A comparative study to evaluate the sealing ability of a prisma dycal placed in cervical root perforation versus other materials (in vitro study)

Authors: Ahmed H. Ali احمد علي --- Raghad A. Mohammed رغد محمد --- Shatha Abdul- Kareem شذى عبد الكريم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 3 Pages: 1-3
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Calcium Hydroxide preparations are used extensively in dentistry, and one of these aspects is treatment of root perforations. The purpose of this in vitro study was to compare the sealing ability of a prisma (visible light cure dycal), amalgam with varnish and chemical cure dycal are used to repair lateral root perforations.Materials and Methods: Thirty extracted human maxillary anterior teeth were used; each tooth was sectioned longitudinally into facial and palatal halves .The perforations were made into each half tooth at the cervical third of the root. The samples were divided into three groups; group I was repaired with prisma, group II repaired with chemically cured dycal and group III with varnish and amalgam .The teeth halves were placed in methylene blue dye for one week period then linear dye penetration was measured from where the repair materials were made.Results: The results showed that a prisma (visible light cure dycal) demonstrated less dye penetration than other groups, the difference was statistically significant (p<0.01) from other groups, non significant differences (p>0.05) were present between amalgam with varnish and the chemically cured dycal.Conclusion: Calcium Hydroxide including the visible light cured and the chemically cured, and the amalgam with varnish, each possess a therapeutic potential for treating known and undetected root perforations. Percentage of leakage was more in amalgam with varnish group than prisma and Kerr Dycal


Article
Apical and Coronal Microleakage using Mineral Trioxide Aggregate (Comparative Study)

Author: Dr. Jamal Aziz Mahdi B.D.S. M.Sc. د.جمال عزيز مهدي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2006 Volume: 3 Issue: 1 Pages: 18-23
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to evaluate the potential of using mineral trioxide aggregate (MTA) as a root canal filling material by comparing its apical sealing ability with that of laterally condensed gutta-percha with sealer in extracted one canal teeth. In addition, this study was evaluating the MTA and ZnPo4 cement as barriers to coronal microleakage.Forty single canal extracted teeth, were prepared in a standard manner using GT file, randomly divided into two groups of 20 teeth, and obturated with laterally condensed gutta-percha or MTA.In each group, 10 teeth received a 4-mm barrier of MTA or ZnPo4 cement. The sealing ability of each part was assessed by immersion in 1% methylene blue dye for 72 h. The leakage was recorded in apical and coronal part. Data were analyzed by One-Way ANOVA test, T-test, and LSD test.Canal filled with laterally condensed gutta-percha showed significantly less apical dye penetration than canals obturated with MTA. However, coronal barrier filled with MTA showed significantly less dye penetration than ZnPo4 cement barrier.


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 influence of flowable composite liner on microleakage of class II packable composite resin restoration with different application techniques (Comparative study)

Authors: Jalal B. Al-Kalamchi جلال الكلامجي --- Luma M. Baban لمى بابان
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: 4 Pages: 19-24
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This in vitro study was conducted to evaluate and compare the influence of flowable composite anddifferent application techniques of class II packable composite restoration on dentinal leakage.Materials and methods: Thirty human freshly-extracted Maxillary premolars were selected for this study. ConventionalClass II MOD cavities were prepared in the sample teeth which were then divided into five groups .Each groupconsist of ten boxes either MO or DO according to the restorative procedure used except group A which consist oftwenty boxes(ten teeth with MOD amalgam restoration). Group A: ten teeth where restored by amalgam- (SDIAustralia) high strength admix amalgam type.Group B: ten teeth in which the mesio-occlusal (MO) sides wererestored by {adhesive + flowable composite + one bulk packable composite (Filtek P60)}. Group C: ten teeth inwhich the disto-occlusal (DO) sides were restored by {adhesive +one bulk packable composite, (Filtek P60)}.Group D:ten teeth in which the mesio-occlusal (MO) sides were restored by {adhesive + flowable composite + successivebuild up technique for packable composite, (Filtek P60)}. Group E: ten teeth in which the disto-occlusal (DO) sideswere restored by {adhesive+ successive build up technique for packable composite, (Filtek P60)}. Afterthermocycling and immersion in 2% methylene blue, the teeth were sectioned longitudinally mesio-occluso-distaland dye penetration was evaluated using a stereomicrscope, microleakage was recorded in mm.Results and Conclusions: ANOVA test and least significant difference (LSD) test were used to analyze the results, andthe results showed that the use of flowable composite resin as a liner with packable composite resin decreases theamount of dentinal microleakage, and the restorative technique of packable composite whether it is bulk build uptechnique, or incremental successive build up technique has no difference on the improvement of microleakgevalue, and the packable resin composite restoration whatever applied with different application techniques orrestored with or without flowable composite it still had or scored higher microleakage than amalgam restoration


Article
The effect of thermocycling on microleakage analysis of bulk filled base composite in comparison to incrementally placed nanohybrid composite in class II MOD restorations (An in vitro study)

Authors: Lena A. Hassan --- Adel F. Ibraheem
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 3 Pages: 28-34
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The study aim was to evaluate thermocycling effect on microleakage of occlusal and cervical marginsof MOD cavity filled with bulk filled composites in comparison to incrementally placed nanohybrid composite and toevaluate the difference in microleakage between enamel and dentin margins for the three materials groups.Materials and method: Forty eight maxillary first premolars were prepared with MOD cavities. Samples were dividedinto three groups of sixteen teeth according to material used: Grandio: Grandio. SDR: SDR +Grandio. X-tra: X-tra base+ Grandio. Each group was subdivided into two according to be thermocycled or not. After 24 hrs immersion in 2%methylene blue, samples weresectioned and microleakage was estimated.Results: Thermocycling significantly increased microleakage at occlusal margin in Grandio group compared to othergroups. SDR composite use before and after thermocycling significantly reduced microleakage at occlusal andcervical enamel margins compared to other groups. Grandio group had non significant difference to X-tra group inmicroleakage before thermocycling at occlusal and cervical enamel margins while it had a significant increase afterthermocycling. No material had significantly reduced dentin margin microleakage before or after thermocycling.Only SDR group before thermocycling, significantly reduced microleakage in enamel margin compared to dentinmargin.Conclusion: Thermocycling did not increase microleakage in all the groups except for Grandio group in occlusalmargin. SDR group showed reduced microleakage in occlusal and enamel margins in comparison to othergroups.None of the materials reduced microleakage in dentin margin


Article
Evaluation of the effect of preheating on micro leakage of Class II composites Restoration (A comparative in vitro study)

Authors: Wasan M. Hasson --- Zainab M. AbdulAmeer
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2017 Volume: 29 Issue: 2 Pages: 21-25
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The aim of this in vitro study was to evaluate and compare the effect of preheating microleakage among three different filler size composites which include Filtektm Z250 micro hybrid, Z250xt Nano hybrid and nanocomposite Z350xt. in Class II cavity preparation .Materials and methods: sixty maxillary first premolars were prepared with class II cavities. Samples were divided into three groups according to material used group A (FiltekZ250 micro hybrid). Group B(Z250xt Nano hybrid). Group C (nanocomposite Z350xt)and each group divided into two subgroups of ten teeth according to temperature of composite: Group A1 Teeth are restored by composite at room temperature(24±1˚C), A2 Teeth are restored by same composite at preheated temperature(54±1˚C). After 24 hrs. immersion in 2% in methylene blue, samples were sectioned and micro leakage was estimated.Results: The greater scores of micro leakage mentioned in Group A( Z250 micro hybrid) in cervical margin while in Group B( Z250xt Nano hybrid) and Group C (Z350xt nanocomposite) have least score of micro leakage especially in occlusal margin.Conclusions: The scores of micro leakage for all groups varied with different material, margin and temperature. Generally, preheating decreased micro leakage in all groups of composites ,but Preheating decreased micro leakage effectively in Z250 micro hybrid more than Z250xt Nano hybrid and Z350xt nanocomposite micro leakage

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