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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
Shear bond and rebond strengths of four composite systems

Authors: Hussain A Obaidi (BDS, MSc ** ) د. حسين العبيدي --- Raid Kh Mustafa BDS, MSc د.رائد مصطفى
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2005 Volume: 2 Issue: 2 Pages: 235-243
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

:The orthodontic composite bonding material is available in various systemwhich are chemically—cured composite such as Two—past and No—mix systems in whiclthe composite set by chemical reaction; Light—cured composite system, in whicl:composite set by light exposure; and Dual—cured composite system, by which thcomposite cured by chemical reaction and light exposure. Thus it is necessary tt.investigate and compare the commonly used composite bonding systemsThis study was aimed to determine and compare the shear bond and reboncstrength of: Two—past composite system (Concise, 3M, Unitek USA), No—mix composite,system (Right—On, TP Orthodontics UK), Light—cured composite system (Transbond XT.)M Unitek USA), and Dual—cured composite system (Sono—Cem ESPE, Germany3,Fifty six upper premolars were divided into four groups of fourteen, each groupmesh—backed metal advant edge brackets were bonded to the buccal surface ofthe teethusing one of the composite system according to the instruction of manufacturer. Then.bonded samples were thermocycled in an attempt to simulate oral circumstancesThe samples were subjected to shear force using the universal compressionmachine apparatus, then the results were recorded in Megapascal (Mpa). The remainingcomposite on the buccal surface of the tooth was removed by hand sealer and polished, anew bracket was bonded to the buccal surface of the tooth using the same type ofcomposite system. The rebonded samples were tested under shear strength using the.universal compression machine apparatus and the results were again recorded in Mpa,The data were statistically analyzed using descriptive analysis, ANOVA test.Dtu1can’s Multiple Range Test and Student’s t—test at p g 0.0lThe results showed that the Concise had no significant higher bond shear strengththan the Transbond and Sono—Cem composite systems, and there was signilicant increasebond strength of the Concise than the Right—On composite systems. Furthermore, therewere no significant differences in bond shear strength among the Right—On, Transbond.and Sono—Cem composite systemsThe shear rebond strength of composite systems was decreased, and there were The shear rebond strength of composite systems was decreased, and there were no.significant differences in bond and rebond shear strength of each composite systemConclusions of this study are that Concise has the higher shear bond strength but.has highest regression in its rebond shear strength


Article
Efficacy of delay in self-etching primer application time on shear bond strength of stainless steel brackets

Authors: Afrah Kh Al- Hamadani د.افراح الحمداني --- Nada M Al- sayagh د.ندى الصايغ --- Ali R Al- katib د. علي الخطيب
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2005 Volume: 2 Issue: 1 Pages: 73-79
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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