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    Effect of a self-adhesive coating on the load-bearing capacity of tooth-coloured restorative materials
    (Wiley, 2017) Bagheri, R.; Palamara, J. E. A.; Mese, A.; Manton, D. J.
    Background The aim of this study was to compare the flexural strength and Vickers hardness of tooth-coloured restorative materials with and without applying a self-adhesive coating for up to 6 months. Methods Specimens were prepared from three resin composites (RC), two resin-modified glass-ionomer cements (RM-GIC) and two conventional glass-ionomer cements (CGIC). All materials were tested both with and without applying G-Coat Plus (GCP). Specimens were conditioned in 37 degrees C distilled deionized water for 24 h, and 1, 3 and 6 months. The specimens were strength tested using a four-point bend test jig in a universal testing machine. The broken specimen's halves were used for Vickers hardness testing. Representative specimens were examined under an environmental scanning electron microscope. Results Data analysis showed that regardless of time and materials, generally the surface coating was associated with a significant increase in the flexural strength of the materials. Applying the GCP decreased the hardness of almost all materials significantly (P < 0.05) and effect of time intervals on hardness was material dependent. Conclusions The load-bearing capacity of the restorative materials was affected by applying self-adhesive coating and ageing. The CGIC had significantly higher hardness but lower flexural strength than the RM-GIC and RC.
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    Effect of microwave energy on fungal growth of resilient denture liner material
    (Diagnosis Press Ltd, 2007) Mese, A.; Mese, S.
    Contamination of resilient denture liner material with microorganisms, particularly Candida albicans, is a common clinical problem. Denture hygiene is essential to maintain the service ability of the denture,and microwave has been suggested for denture disinfection. A resilient denture liner material was contaminated with Candida albicans and reduction of organism counts after test disinfection methods (microwave energy, soaking overnight in a dilute sodium hypochlorite and alkaline peroxide solutions) calculated.
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    Effect of Ultrasonic Versus Manual Cementation on the Fracture Strength of Resin Composite Laminates
    (Operative Dentistry Inc, 2009) Ozcan, M.; Mese, A.
    This study evaluated the effect of conventional versus ultrasonic cementation techniques on the fracture strength of resin composite laminates. In addition, the failure modes were assessed. Window-type preparations I mm above the cemento-enamel junction were made on intact human maxillary central incisors (N=60) of similar size with a depth cutting bur. All the prepared teeth were randomly assigned to six experimental groups (10/per group). Using a highly filled polymeric material (Estenia), laminates were produced and finished. The standard thickness of laminates in original tooth form was achieved using the impression molds made prior to tooth preparation. A three-step bonding procedure and dual polymerized resin composite cement (Panavia F 2.0) was employed. The cementation surfaces of the laminates were conditioned (CoJet-Sand, 30 mu m SiO(2)) and silanized (ESPE-Sil). Laminates in Groups 1, 2, 3, 4 and 5 were cemented by five different operators under finger pressure and Group 6 was cemented ultrasonically (Amdent). After excess removal, the laminates were light polymerized. The specimens were stored in water at 37 degrees C for one month prior to the fracture test (universal testing machine, 1 mm/minute). Failure types were classified as: a) Cohesive failure within the composite laminate (Type A), b) Adhesive failure between the tooth and laminate (Type B) and c) Chipping of the laminate with enamel exposure (Type C). No significant difference was found among the mean fracture strength values of the laminates in all the experimental groups (ANOVA, p=0.251). The mean fracture strength values in descending order were: 513 +/- 197, 439 +/- 125, 423 +/- 163, 411 +/- 126, 390 +/- 94, 352 +/- 117 N for Groups 2,5,4,3 ,1 and 6, respectively. The majority of failure types was Type A (30/60). While Type B failure was not observed in Group 6 (0/10), Group 1 presented a more frequent incidence of this failure (6/10). The two cementation techniques did not effect the fracture strength of composite laminates, but failure types varied between groups, being more favorable for the ultrasonically cemented group.