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    Effects of adhesive system, thermal aging and ceramic shade on the final color and bond strength of monolithic lithium disilicate ceramics
    (2020) Parlar Oz, Ozge
    Aim: The present study aims to observe the effects of adhesive systems and thermocycling on the final color of monolithic lithium disilicate ceramics, also impacts of ceramic shade on the bond strength of resin cement.Material and Methods: Monolithic lithium disilicate ceramic discs in VITA shades A1 and A3 and also self-adhesive, self-etch and total-etch adhesive resin cement systems that were used were investigated in this study. The same color of resin cement (A2 shade) was used for cementation. Ceramic samples of 0,5 mm in thickness were obtained from the IPS e.max CAD blocs. All specimens were distributed into two main groups and six subgroups (n=10) according to the ceramic shade and adhesive system. All specimens were exposed to thermocycling (10,000 cycles). A contact spectrophotometer measured the color differences according to the CIEL*a*b* system. The color differences between before resin cementation (1), after resin cementation procedure (2) and after thermocycling (3), were evaluated. Shear bond strength test was performed after thermocycling.Results: All L values decreased after the resin cementation. The A3-VL (total etch-A3) group had statistically significantly lowest values of L* (p0.05). A3-RX (self-adhesive-A3) group had the statistically significant highest a* and b* values (p0.05). A3-RX group had the highest bond strength results, and there were no statistically significant differences between the A1-VL group (p>0.05). Conclusions: All of the adhesive systems affected the final color of ceramics. Otherwise, the thermal aging procedure did not lead to the changes in the color of the ceramic-resin specimen. Furthermore, ceramic shade affected the bond strength of resin cement after thermocycling.
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    A retrospective analysis of single dental implants in three different diameters
    (2019) Parlar Oz, Ozge; Demirkol, Nermin; Ercil, Mahmut
    Aim: The aim of this study is to examine the distribution of intra-osseous dental implants in the mandible and maxilla applied to correct single missing tooth defects in terms of their size and length and retrospectively evaluate the implant loss rate.Material and methods: Demographic data showing the age/sex and dental implant records of 180 patients who underwent dental implant treatment at our clinic between 2011 and 2016 were retrieved from archival records. Patients with a missing single tooth in the mandible and maxilla who had an implantation in three different diameters (4.1 mm, 4.5 mm, 4.8 mm) were included. The anatomical localizations, height characteristics and rate of losses concerning the implants were analyzed by descriptive statistical analysis.Results: Of the 180 patients, 79 received dental implants with a diameter of 4.1 mm; 49 received dental implants with a diameter of 4.5 mm and 52 received dental implants with a diameter of 4.8 mm, making it 221 in total. The mean age of the patients included in the study was 43.1 years. Of the 180 patients, 105 (58.3%) were male and 75 (41.7%) were female. The length of the most commonly used implant was 14 mm (34%) with a diameter of 4.1 mm (45.2%). Of the 221 implants examined, 111 were placed on the maxilla (50.22%) and 110 on the mandible (49.78%). Of the implants examined, 18 were implanted in the anterior region (8.14%); 33 in the premolar region (15%) and 170 in the molar region (77%).Conclusion: This retrospective study found that single-tooth implant treatment covers a wide range of ages, mainly applied to patients aged 30 to 40 years. Treatment with single-tooth implants was shown to be a successful treatment with a high survival rate when factors such as implant diameter/length and age/sex of the patient are considered.