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    A Comparison of Microleakage Scores of Five Different Types of Composite Resins
    (Taylor & Francis Ltd, 2010) Dallı, Mehmet; Bahsi, Emrullah; Şahbaz, Cafer; İnce, Bayram; Akkus, Zeki; Ercan, Ertuğrul; Atılgan, S. Serhat
    This study aimed to perform a comparative assessment of microleakage in Class V cavities among five different composite resins For this purpose 100 fresh caries-free human permanent molars were randomly assigned to one of five groups (n=20) Clearfil Majesty Esthetic + Clearfil S3 Bond (Group I) TPH Spectrum + Xeno V (Group II) Gradia Direct Anterior + G Bond (GC) (Group III) Premise + Optibond All in One (Group IV) and Charisma + iBond (Group V) were applied and polymerized under LED Specimens were varnished immersed in 0 5% methylene and sectioned bucco-palatinally/lingually and microleakage scores were determined Gingival and occlusal microleakage scores among groups were statistically significant (p < 0 05) (p=0 043 p=0 005) Occlusal microleakage scores for Clearfil Majesty Esthetic and Premise were lower than in the other groups Charisma had the highest microleakage scores with no difference among the other groups (p > 0 05) In conclusion occlusal and gingival microleakage scores were satisfactory except for Charisma
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    Effect of 1% chlorhexidine gel on the bonding strength to dentin
    (Elsevier Taiwan, 2010) Dalli, Mehmet; Ercan, Ertugrul; Zorba, Yahya Orcun; Ince, Bayram; Sahbaz, Cafer; Bahsi, Emrullah; Colak, Hakan
    Background/purpose: The purpose of this in vitro study was to evaluate the effect of 1% chlorhexidine (CHX) gel on dentin bond strengths of posterior composite resin applied with two different adhesive systems. Material and methods: In total, 75 extracted, caries-free human molars were used. The occlusal surface of each tooth was ground to create a flat dentin surface. Then, each tooth was mounted in acrylic. The dentin specimens were randomly assigned to five groups of 15 specimens each. In Group 1, Prime Et Bond NT (PBNT) was applied; in Group 2, a 1% CHX gel + etching for 15 s + PBNT were applied; in Group 3, etching + 1% CHX gel + PBNT were applied; in Group 4, Clearfil S-3 Bond was applied; and in Group 5, 1% CHX gel + Clearfil S-3 Bond were applied. A dentine bonding system was applied to dentin surfaces, and composite cylinders were built up using a special device and then light-polymerized. Specimens were mounted and sheared using an Instron universal testing machine at a cross-head speed of 0.5 mm/min. Results: The results were recorded in megapascals. The sheared specimens were examined under a light microscope, and the type of failure (adhesive, cohesive or mixed) was recorded. Data were compared by one-way analysis of variance and Tukey's honestly significant difference tests. Means were 16.4 +/- 4.1 MPa in Group 1, 16.2 +/- 3.9 MPa in Group 2, 13.0 +/- 4.5 MPa in Group 3, 11.9 +/- 2.7 MPa in Group 4, and 11.5 +/- 2.7 MPa in Group 5. The use of 1% CHX gel before acid etching was significantly higher than after etching on the shear bond strength of PBNT (P < 0.05), but did not differ significantly from PBNT alone (P > 0.05). Conclusion: Within the limitations of the present in vitro study, it was concluded that 1% CHX gel application did not adversely affect the shear bond strengths of dentin-bonding agents.