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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
Evaluation of shear bond strength of composite to newly condensed and set amalgam by using two adhesive systems.

Authors: Inas AL Rawi B.D.S.M.Sc د. ايناس الراوي --- Ahmmed hammed B.D.S.M.Sc د. احمد حامد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2005 Volume: 2 Issue: 1 Pages: 130-137
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The introduction of adhesives has created a new opportunity to bond compositeresin to existing amalgam restoration on aesthetically disturbing surfaces. Further more ,the composite laminate would probably improve the restoration .This in vitro study was conducted to evaluate the shear bond strength ofcomposite resin to fresh and set amalgam by the use of two adhesive systems and to studythe effect of water storage time on the shear bond strength of composite resin to fresh andset amalgamOne hundred and eighty cylindrical specimens, 5mm high x 5 mm in diameter ,composed of 3 mm of amalgam and 2 mm of composite with a layer of bonding materialin between were prepared. Syntac Sc, Excite, control (non bonding) used to bondcomposite resin (Tetric) to the amalgam bases in three groups I, Il and lll (each onecomposed of 60 amalgam bases). Each group divided into two minor groups each of 30amalgam bases one for fresh amalgam bases referred (F) and the other one for setamalgam bases referred (S), each minor group, F and S subdivided into 3 subgroupsaccording to water immersion period into 48hrs, lmonth, 3months,stored at 37 C forscheduled period of time .Specimens were therrnocycled and subjected to shear bond strength testing, andthe mode of failure whether adhesive, mixed cohesive were recorded also. Resultsexpressed very highly statistically significant difference in shear bond strength valuesamong the all three groups with the highest shear bond strength mean values (SBS) forthe control group Ill (without bonding agent) with the greatest SBS values to setamalgam subgroups. While for group. I and II (Syntac SC, Excite) showed the highestSBS mean values to fresh amalgam .The Syntac SC bonding agent shows higher SBSmean than excite bonding agent to either fresh or set amalgam. In conclusion, for bothtypes of bonding agents, Syntac SC performed better in bonding composite resin toamalgam than Excite and the water immersion period has an effect on the SBS meanvalues and on the type of mode of failure


Article
Tensile Bond Strength of Resin Composite to Er,Cr:YSGG Lased Dentin Bonded With Different Adhesive Systems

Authors: Ula A. Fathi --- Ma,an M. Nayif
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2015 Volume: 15 Issue: 2 Pages: 456-462
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: Tensile bond is important for assessing the success of adhesive restorative materials. The aim of this study is to evaluate the tensile bond strength of resin composite restoration to Er,Cr:YSGG lased dentin bonded with three types of adhesive systems. MATERIALS AND METHODS: Occlusal enamel of eighteen molars samples was removed to expose the underlining dentine. Er,Cr:YSGG laser irradiation was performed to central dentin. Samples were assigned randomly to three groups (N = 6): Group Ι: dentin was treated total etch adhesive (Adper single bond, 3M ESPE); Group II: treated with all in one self—etch adhesive (Adper easy one, 3M ESPE); Group III: treated with two step self—etch adhesive (Clearfil SE bond, Kurary). A translucent plastic tube was fixed and filled incrementally with hybrid resin then small metal screw with ring head was embedded in last increment. Samples were stored in distilled water at 37°C for 24 hours. Tensile bond strength was measuredd using universal testing machine (Digital Force Gauge IMADA CO., LTD, Japan), the failure mode was evaluated. Then statistical analysis was done include descriptive, one way analysis of variance test, and Post Hoc tests. RESULTS: A significant differences in tensile bond strength were observed among groups (p < 0.05). Total etch adhesive bonded demonstrate significantly higher tensile bond strength value than one step self–etch and two step self–etch adhesives (p < 0.05). No significant differences were observed between one step self–etch and two step self–etch adhesives (P>0.05). CONCLUSION: The tensile bond strength of resin composite to Er,Cr:YSGG lased dentin was influenced by adhesive type. Total etch adhesive bonded had higher tensile bond strength than one step and two steps self–etch adhesives.

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