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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
Comparative Assessment of In Vitro Effect of Three Fluoride Releasing Agents on Enamel Demineralization around Orthodontic Brackets

Authors: Esraa S. Jasim اسراء جاسم --- Noor M.H. Garma نور محمد حسن --- Samer Aun Thyab سامر عون ذياب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 2 Pages: 126-133
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: White spot lesion considered as irreversible tooth demineralization presenting challenge to orthodontistsduring treatment schedules, fluoride was the most successfully used measure to overcome this challenge.Materials and method: A total of forty sound human permanent premolars were used in the present study andcategorized into four groups, in one group the teeth were bonded with stainless steel brackets using Resin-modifiedglass ionomer cement (RMGIC) and the other three groups the teeth were bonded with light cured compositeResilience® (Ortho technology Co., USA). Group A; Acidulated phosphate fluoride (APF) topical gel (Mfg by DEEPAKPRODUCTS, INC, USA), fluoride ion 1.23% applied on examine area for four minute. Group B; RMGIC (GC Fuji OrthoLC, GC Corporation/Japan) used as bracket adhesive. Group C; Stannous and sodium phosphate fluoride gelyielding 0.72% fluoride ion (Mfg. for: dental resources DS-8) (0.4% Stannous fluoride, 1% sodium fluoride), was applieddaily through the experimental study. D; the control group represents the conventional bonding procedure with nopreventive method. The entire labial surfaces except 2 mm gingival to the bracket were isolated by acid resistancevarnish. All the teeth were subjected individually during 30 days in to acid challenge cycle. After longitudinalsectioning of the teeth by using a hard-tissue microtome, the depth of the artificial lesion was estimated by takingthe average of three penetration depths at the lesion centre under stereomicroscope. Also the enamel surface wasclassified according to acid etch pattern. Comparisons of the average caries penetration of the groups weresubmitted to ANOVA and LSD tests. The statistical significance level was set at p ≤ 0.05.Results: The results revealed that there were statistically significant differences among the tested groups. Withdifferent caries reduction abilities, APF group showed 14%, RMGIC Group 49%, group Stannous and sodiumphosphate fluoride 39% depth reduction compared to the control group.Conclusions: While all the groups showed caries reduction by different fluoride agents used in this study, the lessaverage lesion depth was found at group B making the RMGIG the best caries fighting fluoride measure


Article
Microleakage of class II packable resin composite lined with flowable composite and resin modified glass ionomer cement: An in vitro study

Authors: Haitham J. AL-Azzawi هيثم العزاوي --- Nagham A. AL-Hyali نغم الحيالي --- Firas J. M. Al-Dabbagh فراس الدباغ
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2012 Volume: 24 Issue: special issue 1 Pages: 6-10
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Packable composites most commonly used as posterior restorative materials, however, disadvantageslike polymerization shrinkage limited their use, so the aim of this an in vitro study was to investigate the microleakageof posterior packable composite(Filtek™ P-60) using different liner materials; flowable resin composite(Filtek™ Flow)and resin modified glass ionomer cement (Vitrebond TM 7150) using open sandwich technique at the proximal box ofclass II preparation located above the cemento-enamel junction (CEJ)in enamel.Materials and Methods: Twenty four recently extracted human upper premolars were prepared with standardizedClass- II cavities as follows; Occlusal Outline Form: 2mm in bucco-lingual width and 1.5 mm in depth measured fromocclusal fissure to pulpal floor. Proximal Boxes: The depth of the proximal box from the proximal cavo-surface marginto the axial wall was 2mm, so as the bucco-lingual width (2mm). The proximal box margin located 1 mm coronal tothe CEJ (in enamel). The teeth were assigned into 3 groups (n=8): Group-I (control): acid etching (H3PO4) + bondingagent (Adoper Single Bond 2 Adhesive) + posterior packable composite (Filtek™ P-60), Group-II (RMGIC): acidetching + resin modified glass ionomer cement (Vitrebond TM 7150) + posterior packable composite; Group-III(Flowable): acid etching + bonding agent + flowable composite (Filtek™ Flow) + posterior packable composite.The teeth were immersed in distilled water at 37ºC for 24 h., then thermocycled (1000X, 5°-55°C, 30 sec. dwell time)and immersed in 1% methylene blue solution for 24 h., after that the teeth were sectioned longitudinally in mesiodistaldirection and dye penetration in millimeters were measured in each cavity by using stereomicroscope. Dataobtained were analyzed using ANOVA and LSD tests at 0.05 significance level.Results: The microleakage of posterior packable composite (group-I) significantly (P<0.05) decreased by the twoliners used (group-II and group-III), but there is no statistically significant differences (P>0.05) in enamel microleakagein respect to dye penetration were detected between the two liners used (group-II and group-III), with theassociation flowable composite Filtek flow (group-III) showing the best results.Conclusion: The use of flowable composite (Filtek™ Flow) and resin modified glass ionomer(Vitrebond TM 7150) in theopen sandwich technique decrease the microleakage of posterior packable composite(Filtek™ P-60) with marginlocated in enamel surface and better results with flowable composite


Article
Shear bond strength of different lingual buttons bonded to wet and dry enamel surfaces with resin modified glass ionomer cement (in vitro comparative study)

Authors: Hiba M. Alkhateeb هبة محمد الخطيب --- Eman I. Al-Sheakli ايمان الشيخلي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 146-152
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study was aimed to investigate the effect of three lingual button (Nickel free / rectangular base,Nickel free / round base and Composite) and bonding environment, wet and dry enamel surface, on: the shearbond strength (SBS) of light and self-cured Resin Modified Glass Ionomer Cements, and the debonding failure sites.Materials and method: One hundred twenty no-carious, free of cracks maxillary first premolar teeth were selected.Three types of orthodontic lingual buttons were used in this study: Nickel free / rectangular base, Nickel free / roundbase and Composite buttons. The teeth were divided into two groups of sixty teeth each. One group was used fortesting the chemically cured GC Fuji Ortho Resin modified Glass Ionomer (RMGIC), while the other was used fortesting the light cured GC Fuji Ortho LC RMGIC. Each was further subdivided into two subgroup; thirty teeth werebonded to wet enamel surface while the other was bonded after drying the enamel surface. Then each ten teethfrom each subgroup were bonded with only one type of buttons. The sample was tested for bond strength using theuniversal testing machine and the Adhesive Remnant Index (ARI) was inspected under the stereomicroscope.Results:The highest (SBS) values were obtained in the Nickel free / round base button with both types of RMGIC in wetand dry environment as revealed by ANOVA test. While t-test revealed that both systems of RMGIC yield relativelylower values of (SBS).Conclusions:The GC Fuji Ortho RMGICs resist shear force in dry better that in wet environment.Nickel free / roundbase buttons give the greatest shear bond strength among the three types of button.The composite buttons givegreater bond strength in dry than in wet environment with both GC Fuji Ortho and GC Fuji Ortho LC RMGICs

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