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    Cement Thickness of Inlay Restorations Made of Lithium Disilicate, Polymer-Infiltrated Ceramic and Nano-Ceramic CAD/CAM Materials Evaluated Using 3D X-Ray Micro-Computed Tomography
    (Wiley, 2018) Uzgur, Recep; Ercan, Ertugrul; Uzgur, Zeynep; Colak, Hakan; Yalcin, Muhammet; Ozcan, Mutlu
    PurposeTo evaluate the marginal and internal cement thicknesses of inlay restorations made of various CAD/CAM materials using 3D X-ray micro-computed tomography (micro-CT) technique. Materials and MethodsCaries-free extracted mandibular molars (N = 30) with similar size were randomly assigned to three groups (N = 10 per group). Mesio-occlusal-distal (MOD) cavities were prepared, and inlay restorations were obtained by milling out CAD/CAM materials namely, (a) IPS: monolithic lithium disilicate (control), (b) VE: polymer-infiltrated ceramic, and (c) CS: nano-ceramic using a CAM unit. Marginal and internal cement thicknesses were measured using 3D micro-CT. Data were analyzed using 1-way ANOVA and Tukey's tests (alpha = 0.05). ResultsThe mean marginal and internal cement thickness were not significant in all inlay materials (p > 0.05). Mean marginal cement thickness (m) was the lowest for the IPS group (67.54 10.16) followed by VE (84.09 3.94) and CS (95.18 +/- 10.58) (p > 0.05). The internal cement thickness (m) was the lowest in the CS group (54.85 +/- 6.94) followed by IPS (60.58 +/- 9.22) and VE (77.53 +/- 12.13) (p > 0.05). ConclusionMarginal and internal cement thicknesses of MOD inlays made of monolithic lithium disilicate, polymer-infiltrated ceramic, and nano-ceramic CAD/CAM materials were similar and all less than 100 m, which could be considered clinically acceptable. Clinical significanceMOD inlays made of different CAD/CAM materials presented similar cement thickness, less than 100 m.
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    Öğe
    A Cross-Sectional Survey on Reasons for Initial Placement and Replacement of Single Crowns
    (Dennis Barber Ltd, 2017) Uzgur, Recep; Uzgur, Zeynep; Colak, Hakan; Ercan, Ertugrul; Dalli, Mehmet; Ozcan, Mutlu
    This cross-sectional survey investigated the reasons for placement and replacement of single crowns, the type of materials selected for initial placement and evaluated their longevity. Information was collected over 19 months period using a questionnaire focusing on the principal reasons for the placement and replacement of crowns, selected material type and the age of the crowns at the time of replacement. A total of 842 single crowns were evaluated in 476 patients. Of the 842 crowns, 472 (56%) were initial-placements and 370 (44%) replacements. The main reason for placement of first single crowns was related to endodontic problems (26.5%). Metal-ceramic was indicated significantly more frequent (88.9%; p<0.01) than other materials for the placement and replacement of single crowns. The median age of the replaced crowns was 6 years.
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    Öğe
    A Survey on Prevalence, Causes and Prevention of Post-cementation Hypersensitivity
    (Dennis Barber Ltd, 2016) Demirtag, Zulfikar; Uzgur, Recep; Turkal, Mustafa; Uzgur, Zeynep; Colak, Hakan; Ozcan, Mutlu
    This study evaluated the prevalence and causes of post-cementation sensitivity and possible prevention measures according to the experience of dentists through an inter-net survey. A questionnaire was prepared with 25 items based on a survey introduced by Rosenstiel and Rashid. An online site was created for the participation to the survey. A total of 322 participants responded the questionnaire. The results of the questionnaire indicated the amount of tooth preparation (42.1%) is the most frequent reason for hypersensitivity followed by water-cooling with pressure (11.2%) and provisionals (10.9%). "Very important" response for tooth reduction, time before cementation, overheating, luting agent, occlusion and provisionals were found to be of statistical significance (p<0.001). Comparing respondents' opinions the incidence of post-cementation sensitivity appears to be underestimated. Tooth reduction, preparation under high volume spray and quality of provisional restorations was considered to have a significant impact on the incidence of post-cementation sensitivity according to the dentists surveyed across Turkey. Respondents to the questionnaire considered the use of antimicrobial, desensitizing, resin bonding, hemostatic agents, varnishes, type of liner material, rotary instruments to be less effective for prevention of post-cementation sensitivity.