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    Does 2% chlorhexidine digluconate cavity disinfectant or sodium fluoride/hydroxyethyl methacrylate affect adhesion of universal adhesive to dentin?
    (TAYLOR & FRANCIS LTD, 2016) Kusdemir, Mahmut; Cetin, Ali Riza; Ozsoy, Alev; Toz, Tugba; Bozkurt, Funda Ozturk; Ozcan, Mutlu
    The objectives of this study were to investigate the adhesion of a universal adhesive used either in total-etch (TE) or self-etch (SE) mode with and without 2% chlorhexidine digluconate cavity disinfectant (CHX) or sodium fluoride/hydroxyethyl methacrylate (NaF/HEMA) to dentin. Dentin surfaces of extracted human non-carious third molar teeth (N=18) were exposed and randomly assigned to two groups. Half of the teeth were conditioned with TE and the others with SE adhesive mode. The teeth were then randomly divided into two groups where half were cleaned with 2% CHX (Cavity Cleanser, Bisco, CC) and the other half with NaF/HEMA (Aqua Prep F, Bisco, APF). Control groups in TE (C1) and SE (C2) adhesive system did not receive any cavity disinfectant. Dentin surfaces were conditioned with universal adhesive (Single Bond Universal, SBU) and resin composite blocks (3M Z550) were bonded incrementally on the conditioned dentin using a mold. The teeth were stored in water for 48h, and from each tooth, beam-shaped specimens (1mm(2)) were prepared (n=14, per group). Microtensile bond strength (MBS) was measured using a universal testing machine (1mm/min). Data (MPa) were analyzed using one-way ANOVA and Tukey's test (=0.05). Two-parameter Weibull distribution values including the Weibull modulus, scale (m), and shape ((0)) values were calculated. Mean MTBS results (MPa) showed significant difference between the experimental groups (p=0.001) and were in descending order as follows: C1-CC (32.8 +/- 6.4)a0.05). CC application significantly increased the bond strength in TE mode, but significant reduction was observed when used in SE mode (p<0.05). The use of APF did not significantly decrease the bond strength in TE mode, but significant reduction was observed when used in SE mode. Considering Weibull parameters, characteristics of adhesion seem to be less reliable for C2-CC (m=3.86) and more reliable for C1-CC (m=6.77). Failure types were predominantly adhesive between the dentin and the adhesive resin. Mixed failures were more common for both C1 and C2 and total etch-CC combination.
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    Effect of 2% chlorhexidine gluconate cavity disinfectant on microtensile bond strength of tooth-coloured restorative materials to sound and caries-affected dentin
    (TAYLOR & FRANCIS LTD, 2015) Aykut-Yetkiner, Arzu; Candan, Umit; Ersin, Nazan; Eronat, Cemal; Belli, Sema; Ozcan, Mutlu
    This study evaluated the effect of 2% chlorhexidine gluconate-based cavity disinfectant (CHX) on the microtensile bond strength (mu TBS) of glass ionomer, resin-modified glass ionomer and packable resin composite to sound and caries-affected dentin. Sound and occlusal caries-affected human third molars (N = 36, n = 3 per group) were randomly divided into three experimental groups to receive one of the following restorative materials. (a) Glass ionomer (Ketac Molar, 3M ESPE; GI), (b) resin-modified glass ionomer (Vitremer, 3M ESPE; RMGI) and (c) packable resin composite (Surefil, Dentsply; PRC) with a bonding agent (Prime Bond NT, Dentsply De Trey). Caries was removed using a caries-detecting dye (Caries Detector, Kuraray Medical Ltd.) and flat dentin surfaces were achieved by finishing up to 1200-grit silicon carbide abrasive. Half of the teeth in each group received 2% CHX (Consepsis, Ultradent). Dentin surfaces were built-up with the respective materials incrementally and were sectioned with a slow-speed saw into multiple beams. The beams were subjected to mu TBS test (0.5mm/min) in a Universal Testing Machine. The data were analysed using two-way analysis of variance and Tukey's tests. For each restorative material, mu TBS results were not affected by the application of CHX (p > 0.05) on both sound and caries-affected dentin (p > 0.05). PRC in combination with the corresponding bonding agent showed significantly higher results (p < 0.05) than those of GI and RMGI, on sound and caries-affected teeth, respectively. Cohesive failure in dentin was not observed in any of the groups. The use of 2% chlorhexidine-based cavity disinfectant did not impair the adhesion of the restorative materials tested to either sound or caries-affected dentin.
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    Influence of Powdered Dentin on the Shear Bond Strength of Dentin Bonding Systems
    (Japanese Soc Dental Materials Devices, 2012) Eliguzeloglu Dalkilic, Evrim; Genc, Özgür; Özcopur, Betül; Belli, Sema; Eskitascioglu, Gurcan; Ozcan, Mutlu
    This study evaluated the effect of different amounts of dentin powder (DP) mixed in Clearfil SE Bond (CSB) or Single Bond (SB) on adhesion to dentin. Human third molars (n=96) were sectioned to expose the mid-coronal dentin and divided into eight experimental groups (n=12 per group), namely, Group 1: CSB, Group 2: CSB+1.5 mg DP, Group 3: CSB+3 mg DP, Group 4: CSB+4.5 mg DP, Group 5: SB, Group 6: SB+1.5 mg DP, Group 7: SB+3 mg DP, and Group 8: SB+4.5 mg DP. Filtek Z250 composite was bonded onto dentin, and all specimens were subjected to shear bond strength test at a crosshead speed of 1 mm/min. Highest bond strength was obtained in Groups 1, 2, and 3 (15.1, 13.5, and 16.4 MPa respectively; p>0.05) and the lowest in Groups 6, 7, and 8 (5.5, 5.6, 4 MPa; p>0.05). DP addition, regardless of amount, adversely affected the bond strength of SB. Bond strength of CSB was not affected when 1.5 or 3 rag of DP was added.