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TÜRKMEN, CAFER

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    Effect of CO2, Nd : YAG, and ArF excimer lasers on dentin morphology and pulp chamber temperature: An in vitro study
    (LIPPINCOTT WILLIAMS & WILKINS, 2000) TÜRKMEN, CAFER; Turkmen, C; Gunday, M; Karacorlu, M; Basaran, B
    This study compared the effect of three laser systems: CO2 (10.600 nm), Nd:YAG (1.064 nm), and ArF excimer (193 nm) Lasers on dentin hard tissue and on temperature increases of the pulp chamber. Sixty-six third molar teeth were used and randomly divided into three groups. A class I cavity was made to expose the dentin, and the pulp in the pulp chamber was removed via a hole bored in the cervical area. The pulp chamber was subsequently refilled with silicon grease, and a NiCr/NiSi thermocouple was inserted through the hole into the pulp chamber. The dentin surface was then lased for 30 s at the same settings (3 W, 2 mm spot size, 20 pps) with each laser. The average internal temperature increases were as follows: CO2, 37 degreesC; Nd: YAG, 28 degreesC; and ArF excimer, 1 degreesC. Scanning electron microscopy of the dentin in the occlusal cavity revealed extensive carbonization, isolated balls of recrystallized material, and the presence of smear layer at some dentinal tubule orifices for the CO2 and Nd:YAG lased teeth. Smear layer was also observed for the ArF excimer samples; however, they exhibited far less surface cavities than the others and seemed to undergo little morphological change on the dentin.
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    Shear Bond Strength of Indirect Composites Luted with Three New Self-Adhesive Resin Cements to Dentin
    (TAYLOR & FRANCIS LTD, 2009) TÜRKMEN, CAFER; Tuerkmen, Cafer; Durkan, Meral; Oksuz, Mustafa
    The aim of this study was to evaluate the shear bond strengths of indirect composites (those cured outside the mouth) luted by three different, recently developed, self-adhesive resin cements to dentin. Seventy caries-free mandibular third molar teeth embedded in acrylic resin and with exposed dentin surfaces were used. Teeth were randomly divided into seven groups. The following application protocols were carried out: a) Group 1 (control group)direct composite resin restoration (Alert) with total-etch adhesive system (Bond 1 primer/adhesive); b) Group 2indirect composite restoration (Estenia) luted by a resin cement (Cement-It) combined with the same total-etch adhesive; c) Group 3direct composite resin restoration with self-etch adhesive system (Nano-Bond); d) Group 4indirect composite restoration luted by the resin cement combined with the same self-etch adhesive; e) Groups 5-7indirect composite restoration luted with self-adhesive resin cements (RelyX Unicem (R), Maxcem (R), and Embrace WetBond (R), respectively) onto untreated dentin surfaces. Shear bond strengths of the groups were performed with a universal testing device. Results were statistically analysed by student-t and one way ANOVA tests. The fractured surfaces were also examined by SEM. The indirect composite restorations luted with the self-adhesive resin cements (Groups 5-7) showed successful results compared with the other groups (p0.05). Group 4 showed the weakest bond strength (p0.05). Open dentin tubules were observed on the total-etch adhesive applied surfaces whereas a smear rich layer was found by SEM on the self-etch adhesive applied surfaces. The new universal self-adhesive resins may be considered an alternative for luting the indirect composite restorations onto the untreated dentin surfaces.