Acta Stomatologica Cappadocia <p>Acta Stomatologica Cappadocia is the scientific publication of Cappadocia University Faculty of Dentistry.</p> <p>It is a peer-reviewed journal that aims to reach all national and international institutions and individuals related to the science of dentistry electronically, free of charge.</p> Kapadokya Üniversitesi en-US Acta Stomatologica Cappadocia 2792-047X <p><a href="">Creative Commons Atıf-GayrıTicari 4.0 Uluslararası</a> (CC BY-NC 4.0) </p> Influence of Composition and Thickness on The Color and Translucency of Glass-Ceramic Materials for Laminate Veneer Restorations: An In Vitro study <p><strong>Statement of the problem:</strong> Numerous glass-ceramic materials are commercially available, yet achieving optimal esthetic results relies significantly on material composition and thickness. The selection of suitable material and thickness poses an ongoing challenge in clinical practice.</p> <p><strong>Objective</strong>: This study aimed to investigate the effect of the composition and thickness of different glass-ceramic materials on the Commission Internationale de l'éclairage (CIE) L*, a*, and b* color coordinates and the translucency parameter (TP<sub>00</sub>).</p> <p><strong>Materials &amp; Methods:</strong> Glass-ceramic blocks of A2 shade, with low translucency, encompassing feldspathic (FS), leucite-reinforced feldspathic (LR), and lithium-disilicate (LD) compositions, were sectioned into three thicknesses: 0.5 mm, 0.7 mm, and 1 mm (n=10). All specimens were polished with ceramic polishing rubbers. Using a spectrophotometer, the CIE L*, a*, and b* color coordinates of the specimens were measured over gray, white, and black backgrounds. The TP<sub>00</sub> was calculated using the CIEDE2000 color difference formula. The CIE L*, a*, b*, and TP<sub>00</sub> were analyzed using two-way ANOVA and Tukey HSD post-hoc tests (α=0.05).</p> <p><strong>Results:</strong> Material, thickness, and their interaction significantly influenced the CIE L*, a*, b*, and TP<sub>00</sub> values (P&lt;0.001). The LR group displayed the highest L* and a* values, while the LD group showed the lowest (P&lt;0.001). Conversely, the LD group exhibited the highest b* value (P&lt;0.001). Lightness was lowest in 0.5 mm-thick specimens (P&lt;0.001) and similar for 0.7 mm-thick and 1.0 mm-thick specimens (P&gt;0.05). Redness and yellowness increased with increasing thickness (P&lt;0.001). Regardless of thickness, the FS group had the highest TP<sub>00</sub> (16.32±1.54), while the LR group had the lowest TP<sub>00</sub> (14.31±1.67). Regardless of material, 0.5 mm-thick specimens demonstrated significantly higher TP<sub>00</sub> (17.49±1.10) than 0.7 mm-thick (15.45±0.83) and 1.0 mm-thick (13.11±1.12) specimens. There was no significant difference between the 0.5 mm-thick FS and LD groups (P&gt;0.05) and 1.0 mm-thick LR and LD groups (P&gt;0.05).</p> <p><strong>Conclusions:</strong> Even when sharing the same shade, glass ceramics may exhibit varying color and translucency properties due to their distinct chemical compositions and thicknesses.</p> Tuba Yılmaz Savaş Seda Yıldızlar Copyright (c) 2023 Tuba Yılmaz Savaş, Seda Yıldızlar 2023-12-30 2023-12-30 3 2 62 75 10.54995/ASC.3.2.1 Comparative Evaluation of The Microhardness of Artificial Teeth of Various Composition <p><strong>Statement of the problem:</strong> To help physicians choose the right materials for treatment planning, it is necessary to investigate to the mechanical and physical characteristics of denture teeth made with new technology.</p> <p><strong>Objective</strong>: This study aims to investigate the comparative microhardness of artificial teeth with different composition.</p> <p><strong>Materials &amp; Methods:</strong> A total of 96 specimens (n=32) were prepared using three different types of artificial teeth (conventional polymethylmethacrylate, , and nanohybrid composite) (Group CA - Conventional PMMA, Group IS - Isosite Group DCL - double cross-linked acrylic). Surface hardness values were determined using a microhardness tester (Shimadzu HMV Corporation, Tokyo, Japan) with a load of 500 g and a dwell time of 15 seconds. Three indentations were obtained for each sample and the Vickers Hardness Number (VHN) was calculated and averaged. One-way analysis of variance (ANOVA) and post-hoc Tukey HSD tests were used for statistical analysis. The statistical significance level of the data was taken as α=0.05.</p> <p><strong>Results:</strong> The highest microhardness values were observed in Group IS (53.96 ± 8.5 VHN) and the lowest in Group CA (53.55±9.9 VHN). However, no statistically significant difference was found between the groups (P&gt;0.05).</p> <p><strong>Conclusions:</strong> For the durability and function of prosthetic rehabilitations performed by clinicians, the choice of artificial teeth should not be ignored, based on cost and accessibility criteria.</p> Nazire Esra Özer Copyright (c) 2023 nazire esra özer 2023-12-30 2023-12-30 3 2 76 85 10.54995/ASC.3.2.2 Effects of Different Chemical Disinfectants on Physical Properties of Denture Base Acrylic Resin Material <p><strong>Statement of the problem: </strong>There is still a lack of data regarding the effects of exposure to different chemical disinfectants on the color stability, light translucency, and surface roughness of dentures is limited.</p> <p><strong>Objective: </strong>This study aims to investigate the impact of six different chemical disinfectants on the color change, translucency, and surface roughness properties of heat-polymerized denture base acrylic resin.</p> <p><strong>Material &amp; Methods: </strong>Totally 70 rectangular blocks (10×10×2 mm) were polymerized from the heat-polymerized acrylic denture base resin material. The surfaces of the specimens polished with 600- and 1200-grit waterproof abrasive paper. Each specimen were immersed in six denture cleansers. The total immersion time of a specimen in selected chemical disinfectant was 36 hours. Color changes, translucency and, surface roughness were measured after immersion process. The results were statistically analyzed with 1-way ANOVA and the Tukey honestly significant difference (HSD) test (α=.05).</p> <p> </p> <p><strong>Results: </strong>According to the results of the 1-way ANOVA test, significant differences were observed in the ∆E<sub>00</sub>, TP<sub>00</sub> and Ra properties among the acrylic resin groups following immersion in chemical disinfectants (P&lt;0.05). ΔE<sub>00</sub> value of the CG group was significantly higher than that of the NS, SH, G, and E groups (P&lt;0.05). The TP<sub>00</sub> values of the NS and G groups were demonstrated significant differences compared with C group (P&lt;0.05). The Ra values of the SH, SP, G, CG and, E groups were significantly increased after immersion process, in comparison with C and NS groups (P&lt;0.05).</p> <p><strong>Conclusions: </strong>Color stability, translucency and surface roughness of the denture base heat polymerized acrylic resin is influenced by chemical disinfectants.</p> Nurten Baysal Tuba Yılmaz Savaş Barış Filiz Erol Hilal Erdoğan Onur Altuğ Sakallı Nesrin Büyükbaş Copyright (c) 2023 Nurten Baysal, Selçuk University, Department of Prosthodontics , University of Health Sciences, Department of Prosthodontics, Nevşehir Hacı Bektaş Veli University, Department of Endodontics, Cappadocia University, Department of Prosthodontics, Cappadocia University, Department of Prosthodontics 2023-12-30 2023-12-30 3 2 86 98 10.54995/ASC.3.2.3 Comparison of Shade Matching Performance of Dental Professionals and Untrained Individuals in Visual Shade Matching Method <p><strong>Statement of the problem:</strong> It is unclear how the success of color selection with custom shade guides is influenced by the observer's level of color education and the type of light source.</p> <p><strong>Objective:</strong> The aim of this study is to compare the color matching ability under different light sources between observers with and without color education and to investigate in which shade tabs they are more successful, using a custom-made shade guide.</p> <p><strong>Materials &amp; Methods:</strong> The study included 5 prosthodontists (PD), 5 general dentists (GD), 5 dental ceramists (DC), 5 removable denture technicians (RDT), and 10 participants with no color education (NP). Using dentin powder from feldspathic dental porcelain, 2 sets of 16 shade tabs matching those in the Vita Lumin Classic shade guide were produced. The Lab values of the produced shade tabs with the same shade code were measured using a colorimeter device, and those with ΔE values below 0.1 were used for shade matching. Each participant conducted a total of 48 shade matches under 3 different light sources (tungsten-TG, fluorescent-FL, and D65).</p> <p><strong>Results:</strong> It was found that the shade matching success of dental professionals in the PD, GD, RDT, and DC groups significantly differed from that of the participants in the NP group (χ² = 23.417; P&lt; 0.001). Shade matches conducted under the D65 light source were more successful than those under the TG and FL light sources, and participants were found to match shade tabs with higher saturation, such as A4 and C4, more successfully.</p> <p><strong>Conclusions:</strong> Color matching performed with a custom color scale is influenced by the observer's training and the light source. As the saturation of shade tabs increases, the matching success also increases.</p> Bülent Pişkin Barış Filiz Erol Bedri Beydemir Nurten Baysal Onur Altuğ Sakallı Nesrin Büyükbaş Copyright (c) 2023 Barış Filiz Erol, Bülent Pişkin, Bedri Beydemir, Nurten Baysal, Onur Altuğ Sakallı, Nesrin Büyükbaş 2023-12-30 2023-12-30 3 2 99 114 10.54995/ASC.3.2.4 COVID-19 and Oral and Maxillofacial Imaging and COVID-19 Oral and Maxillofacial Radiology <p>Oral and Maxillofacial Radiology (OMFR) Clinics, private or at Dental Schools, represent a potential environment for transmission and cross-infection of coronavirus disease 2019 (COVID-19). During OMFR procedures, such as intra- or extraoral imaging examinations, cone-beam computed tomography, and ultrasonography, the dental staff is in direct contact with patients, increasing the risk of disease transmission. Thus, new biosafety protocols had to be adopted. Due to the high transmissibility of SARS-CoV-2 highly restrictive measures were imposed, and social distance was the main one. In this scenario, teleradiology was encouraged to reduce contamination and protect radiologists, and dental schools had to take strict precautions in their traditional educational system. Considering recent literature regarding OMFR and COVID-19, this review provides substantial data about the new precautions of biosafety, teleradiology, and the impact on OMFR teaching.</p> Franciella Verner Kıvanç Kamburoğlu Copyright (c) 2023 Kıvanç Kamburoğlu, Franciella Verner 2023-12-30 2023-12-30 3 2 114 121 10.54995/ASC.3.2.5