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Article
The Effect of Chemomechanical Caries Removal and Different Bonding Systems on Shear Bond Strength of Carious Dentin (In Vitro Study)

Authors: Dr. Shatha Abdullah Salih B.D.S, M.Sc د.ثذى عبد الله صلاح --- Dr. Twana Ihssan Mohammed B.D.S د.توانا احسان
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2011 Volume: 8 Issue: 2 Pages: 115-126
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this in vitro study was to determine whether shear bond strength(SBS) to chemomechanically excavated dentine by Carisolv (CS) differed from theSBS after conventional caries removal by bur (CB), with the use of the followingadhesive systems: [Total-etch (TE), etch and Compobond1, etch, prime and bondingresin]; [Self-etch (SE), Xeno v, one component self-etching dental adhesive] and [Noetch(NE), Compobond1, prime& bond only]. Fifty human molars with occlusal carieswere used to prepare dentin samples which were assigned to 5 groups: group I and IIIthe prepared samples treated by CB and CS respectively then with TE, group II andIV the prepared samples treated by CB and CS respectively then with SE, while ingroup V the prepared samples treated by CS and then with NE. For each sample therewas light cured composite core build up. After water storage, the samples were testedin a single-plane shear test assembly. The results demonstrated that there werestatistical significant differences with in the mode of caries removal groups and alsothere were statistical significant differences between the bonding systems which affectSBS of carious dentin at p < 0.01, with in favor of the TE over SE. The present datademonstrate that with the use of CS on (carious dentin, there was either increase ordecrease in bond strength in relation with different bonding systems.


Article
Effect of etchant type and the use of silane on the shearbond strength of composite resin to porcelain.

Author: Abdulla MWAl-Shamma عبد الله محمد وجيه الشماع
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: 4 Pages: 1-6
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study was formulated to compare the effect of 5%hydrofluoric acid in comparison to37%phosphoric acid with and without the application of silane on bond strength of composite to porcelain.Materials and Methods: Specimen preparation was divided in to two phases, metal-disks fabrication (8mm-diameterand 4mm-thickness) and ceramic veneering. Thirty two specimens were prepared, sandblasted with 50 μm aluminumoxide, and divided into four groups of eight samples. Groups I and III were etched with 37%phosphoric acid whilegroups II and IV were etched with 5%hydrofluoric acid; and groups I and II were silaneted while groups III and IV werenot. Heliobond, and resin composite were applied to each specimen using a plastic transparent split mold (4mmdiameterand 4mm-height). Specimens were stored in distilled water for 24 hours then thermocycled for 100 cycles.Shear bond strength was determined by a Zwick universal machine at a cross-head speed 5 mm/minute.Results: Mean shear bond strength values were 21.02(group I), 23.31(group II), 4.00(group III), and 18.60(group IV).Paired-t revealed that specimens treated with 5%hydrofluoric acid were significantly higher than those treated with37%phosphoric acid regardless the use of silane. The use of silane dramatically enhanced the bond strength ofcomposite resin to porcelain for both acids. All specimens treated with 37%phosphoric acid without silane showedadhesive failure, while those treated with 5%hydrofluoric acid showed mostly cohesive failure within ceramic.Conclusion: Silane improved the shear bond strength of composite to ceramic, and hydrofluoric acid performedgreater bond strength compared to phosphoric acid.


Article
Laser versus conventional acid etching technique on bond strength on orthodontic brackets (An in vitro study)

Authors: Zaid A Ibrahim --- Abdul– Rahman I Ali --- Khidhair A Al–Jumaili
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 3 Pages: 124-130
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This in vitro study was undertaken to evaluate and compare the effect of acid etching and/or diode laser (1064 nm) irradiation on shear bond strength of orthodontic brackets. Materials and Methods: Thirty freshly extracted human premolars were included in this study. Laser irradiation was done by using the new 1064 nm diode laser with output power of 2.5 Watt in continues mode, also use stainless steel orthodontic brackets (Roth, 22–slot size), and use orthodontic flowable composite resin which needs no bonding fluid. The 30 human teeth were divided into 3 groups (each group consist of 10 teeth): Group A–use acid etching (37% phosphoric acid) for 1 minute to bond bracket to tooth surface (control group), group B–use laser irradiation for 30 seconds with Indian ink (coated on teeth). Group C–use laser irradiation for 30 seconds with Indian ink after that use acid etching for 1 minute. Shear bond strength measured by using unconfined shear testing machine at a cross head speed of 5 mm/min. Results: The shear bond strength means were as follows: Group A: 11.27 MPa, group B: 6.21 MPa, group C: 14.04 MPa. The acid etching after 1064 nm diode laser irradiation (group C) has significantly higher bond strength (p 0.05) than remaining groups. In group B, orthodontic brackets had significantly lower shear bond strength (p 0.05) than remaining groups. Conclusions: These results indicate that acid etching after laser irradiation enhances and improves the bonding of orthodontic composite resin to human enamel. In the same time 1064 nm diode laser irradiation with ink coating is not consider as a replacement to acid etching in bonding of orthodontic brackets to human enamel


Article
Effect of surface treatment on shear bond strength of artificial teeth to the denture base

Authors: Dr. Mithaq Radhi Mohammed M.Sc. د.ميثاق راضي --- Dr. Nabeel Abdul- Fatah M.Sc. د.نبيل عبد الفتاح
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2011 Volume: 8 Issue: 2 Pages: 171-176
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Fracture or debonding of plastic teeth from the denture base are common clinicalproblems, the optimal combination of acrylic resin denture teeth and microware cureddenture base resin is not well known .one hundred and twenty teeth (florident, acrylicteeth cross-linked, china) were prepared and cured by heat cured (AkrilEks, heatcuringresin for denture powder liquid, GuLSA LTD. Izmir-Turkey), and microwarecured (Acron mc, microwave-curing denture base resin powder liquid, GCLABTechnologies inc. Alsip,IL60803 Japan) acrylic resin were used, then the teeth weredivided into six groups and treated with different surface treatment, the first groupreceived no further treatment(control); the second group treatment with diatoricpreparation; the third group treated with thinner(Turpentine-DYNA CoAT, Thinner,Netherlands); the fourth group treated with tone(Propanone, Acetone, England 99%Purity-Analyer); the fifth group were diatoric conditioned with acetone; the sixthgroup were diatoric conditioned with thinner;(2nd group, 5th group and 6th group hadbeen a cutting mesiodistal retention grooves 2mm deep and 3mm wide acute intoridge lap in acrylic resin teeth. One hundred and twenty specimens were divided intotwo groups, first one was processed by conventional method and the other oneprocessed by microwave method and then tested by instron universal testing machine(instron corporation 1195,canton mass).The results showed than microwave-curedresin has a significant lower shear bond strength(SBS) mean values than water bathcuredresin to all denture teeth types. All surface treatment application improvedthe(SBS) significantly level at(p value < 0.05), while the sixth group (diatoricconditioned with thinner) showed the highest(SBS) than other group. The types ofacrylic denture resin, surface treatment and curing technique influenced the shearbond strength of the tooth to the base the results of this study influenced the shearbond strength of the tooth to the base. The results of this study indicate that diatoriccondition with thinner may be recommended to be applied on the denture ridge lapprior to denture base processing.

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