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    Antimicrobial Activity of Different Solutions on Denture Base Materials
    (Georg Thieme Verlag Kg, 2018) Tuncdemir, Ali Riza; Ugur, Ayse Ruveyda; Ozdemir, Bilgen; Kahraman, Kubra T.
    There are a few chemical solutions used for prosthetic cleaning and they have different antimicrobial effects on denture materials. The aim of this study is to evaluate the efficacy of various chemical solutions used in prosthetic cleaning. For this purpose, 40 specimens of polymethylmethacrylate (PMMA-Meliodent, HeraeusKulzer, Hanau, Germany), which is the most commonly used material in conventional prostheses, and 40 specimens of Deflex (Nuxen SRL, Ayacucho 1053 3-A, Cap. Fed. Buenos Aires, Argentina), which is polyamide-containing semi-flexible acrylic, were molded using a template at the laboratory of Dentistry Faculty. Leveling began with abrasive burs and Stones followed by the sanding with medium and thin discs. Surface preparation was done using wet pumice and felt followed by polishing with gypsum-alcohol and rotary soft brush. The evaluated three solutions are Corega cleaning tablets containing alkaline peroxide, 0.2% chlorhexidine gluconate (CG) and 1% sodium hypochlorite (NaOCl). Distilled water was used as the control group. When both groups of polymers were evaluated in respect to the Candida growth after they were kept in liquid containing NaOCl, Corega, and CG, it was observed that only the acrylics that were kept in Corega revealed Candida growth. It was concluded that Corega could not sufficiently inhibit the growth of Candida albicans which is the one of themost common microorganisms in the oral flora of pediatric and elderly patients. NaOCl and CG can be used safely and effectively for denture cleaning.
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    Assessment of Calcified Carotid Artery Plaques on Digital Panoramic Radiographs of Middle-aged and Older Asymptomatic Persons in a Turkish Subpopulation and Associated Risk Factors
    (Kowsar Publ, 2019) Magat, Guldane; Tuncdemir, Ali Riza
    Background: Vascular calcifications caused by atherosclerosis are frequently observed, especially in aortic and carotid arteries, with large and elastic characteristics. Early detection of calcification in these arteries can play an important role in reducing the clinical pathologies where atherosclerosis may cause, such as stroke and long-time disability. Objectives: The aim of the present study was to determine the prevalence of calcified carotid artery plaques (CCAPs) on digital panoramic radiographs (DPR) and its association with gender, age, as well as 3 risk factors of cerebrovascular attack including hypertension, cardiovascular diseases, and diabetes mellitus. Materials and Methods: In this retrospective study, a total of 500 DPRs of subjects 45 years old and older (248 females and 252 males) were evaluated. All the subjects had been referred to the Faculty of Dentistry, Necmettin Erbakan University, Konya, Turkey, during 2014 -2017 for a routine dental examination. Socio-demographicvariables, as well as medical anamnesis, were obtained from the participants and medical records. The radiographs were grouped according to gender, age groups (45 - 60 years old and 61 years old and older), and associated risk factors (diabetes mellitus, hypertension, and cardiovascular diseases). Results: Of 500 DPR5, 243 (48.6%) were noted to have CCAPs. The 243 individuals who had CCAPs consisted of 119 males (49.0% of all males) and 124 females (51.0% of all females). Of the subjects aged 45 - 60 years old, 87 individuals (17.4%) showed carotid artery calcifications on their DPR5 while 156 subjects (31.2%) aged 61 years old and older showed carotid calcification. There were significant differences between age groups, hypertension, cardiovascular diseases, and the prevalence of CCAP, which increased (P < 0.01). As the associated risk factor increased, the prevalence of bilateral CCAP also increased (P < 0.01). Conclusions: The existence of bilateral calcified carotid artery plaques on digital panoramic radiographs has a higher prevalence in the subjects who had at least two associated risk factors and older; however, their detection is important to orient the diagnosis and prevention of diseases in asymptomatic high-risk patients.
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    The effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement
    (Korean Acad Prosthodontics, 2013) Tuncdemir, Ali Riza; Yildirim, Cihan; Ozcan, Erhan; Polat, Serdar
    PURPOSE. The purpose of this study was to compare the effect of a diode laser and traditional irrigants on the bond strength of self-adhesive cement. MATERIALS AND METHODS. Fifty-five incisors extracted due to periodontal problems were used. All teeth were instrumented using a set of rotary root canal instruments. The post spaces were enlarged for a No.14 (diameter, 1.4 mm) Snow light (Abrasive technology, OH, USA) glass fiber reinforced composite post with matching drill. The teeth were randomly divided into 5 experimental groups of 11 teeth each. The post spaces were treated with the followings: Group 1: 5 mL 0.9% physiological saline; Group 2: 5 mL 5.25% sodium hypochlorite; Group 3: 5 mL 17% ethylene diamine tetra acetic acid (EDTA), Group 4: 37% orthophosphoric acid and Group 5: Photodynamic diode laser irradiation for 1 minute after application of light-active dye solution. Snow light posts were luted with self-adhesive resin cement. Each root was sectioned perpendicular to its long axis to create 1 mm thick specimens. The push-out bond strength test method was used to measure bond strength. One tooth from each group was processed for scanning electron microscopic analysis. RESULTS. Bond strength values were as follow: Group 1 = 4.15 MPa; Group 2 = 3.00 MPa; Group 3 = 4.45 MPa; Group 4 = 6.96 MPa; and Group 5 = 8.93 MPa. These values were analysed using one-way ANOVA and Tukey honestly significant difference test (P<.05). Significantly higher bond strength values were obtained with the diode laser and orthophosphoric acid (P<.05). There were no differences found between the other groups (P>.05). CONCLUSION. Orthophosphoric acid and EDTA were more effective methods for removing the smear layer than the diode laser. However, the diode laser and orthophosphoric acid were more effective at the cement dentin interface than the EDTA, Therefore, modifying the smear layer may be more effective when a self-adhesive system is used.
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    Effects of Fibers on Color and Translucency Changes of Bulk-Fill and Anterior Composites after Accelerated Aging
    (Hindawi Ltd, 2018) Tuncdemir, Ali Riza; Guven, Mehmet Esad
    The aim of this study was to determine the effects of glass and polyethylene fibers on the color and translucency change of bulk-fill and anterior composites before and after artificial accelerated aging (AAA). Two types of teflon molds were used to fabricate samples which were 13 mm in diameter and, respectively, 2 mm and 4 mm in height. Polyethylene fiber (PF) and glass fiber (GF) were incorporated in the middle of the composite samples. Color and translucency changes of each composite were evaluated before and after AAA with spectrophotometer. ANOVA and Tukey's HSD post hoc statistical analysis were used at a significance level of 0.05. Before AAA (for anterior composites), there were no significant differences in L* and b* parameters among the three groups (p > 0.05); there were no significant differences in L* parameter between PF and GF groups or in TP between GF and control groups (p > 0.05) (for bulk-fill composites). After AAA, there were no significant differences in L* parameter between GF and control groups, in L* parameter between PF and control groups, in L* parameter among all groups, or in TP parameter between GF and control groups (p > 0.05). Fiber reinforcement led to color and TP change in both anterior and bulk-fill resin composites.
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    An evaluation of the stress effect of different occlusion concepts on hybrid abutment and implant supported monolithic zirconia fixed prosthesis: A finite element analysis
    (Korean Acad Prosthodontics, 2021) Yesilyurt, Nilgun Gulbahce; Tuncdemir, Ali Riza
    PURPOSE. The aim of this study is to evaluate the effects of canine guidance occlusion and group function occlusion on the degree of stress to the bone, implants, abutments, and crowns using finite element analysis (FEA). MATERIALS AND METHODS. This study included the implant-prosthesis system of a three-unit bridge made of monolithic zirconia and hybrid abutments. Threedimensional (3D) models of a bone-level implant system and a titanium base abutment were created using the original implant components. Two titanium implants, measuring 4 x 11 mm each, were selected. The loads were applied in two oblique directions of 15 degrees and 30 degrees under two occlusal movement conditions. In the canine guidance condition, loads (100 N) were applied to the canine crown only. In the group function condition, loads were applied to all three teeth. In this loading, a force of 100 N was applied to the canine, and 200-N forces were applied to each premolar. The stress distribution among all the components of the implant-bridge system was assessed using ANSYS SpaceClaim 2020 R2 software and finite element analysis. RESULTS. Maximum stress was found in the group function occlusion. The maximum stress increased with an increase in the angle of occlusal force. CONCLUSION. The canine guidance occlusion with monolithic zirconia crown materials is promising for implant-supported prostheses in the canine and premolar areas. [J Adv Prosthodont 2021;13:216-25]
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    Investigation of the Antimicrobial Effect of Different Disinfectants on Alginate Measurement Materials
    (Georg Thieme Verlag Kg, 2023) Guntekin, Neslihan; Arslan, Gokce Kader; Ozdemir, Mehmet; Tuncdemir, Ali Riza
    Objective The impression materials are contaminated with pathogenic microorganisms carried by saliva and blood in the mouth. The aim of this study is to evaluate the antimicrobial activity of 1 and 5.25% sodium hypochlorite (NaClO) and zeta 7 solution, a commercial disinfectant, on alginate and to compare it washing with distilled water. Methods Samples obtained from alginate impressions taken from eight pediatric patients selected in accordance with the inclusion criteria with a size of 1 x 1 cm were subjected to five different disinfection protocols. After samples were vortexed in 3-mL physiological saline, 1-mL volume were inoculated onto brain heart infusion agar and cultured at 37 & DEG;C for 72 hours to determine the number of colony-forming units/mL. Streptococcus mutans , Staphylococcus aureus , Escherichia coli , Candida albicans were used as control strains. The data obtained were statistically evaluated by using analysis of variance and post-hoc tests. The differences were considered statistically significant when p < 0.05. Results All of the disinfectant solutions tested were effective in the disinfection of the impression materials examined. The control group with no treatment and the water and flushing group had a significantly higher bacterial load compared to the other disinfectant-treated groups in terms of bacterial load, and no significant difference has been observed between the disinfectant solutions ( p < 0.05). Simple rinsing of the impressions in sterile water reduced the number of microorganisms but did not decontaminate the impressions. Conclusion Washing with water alone is insufficient for measured disinfection. Although NaClO is an effective disinfectant even at low concentrations, microorganism growth was not observed at 5.25% concentration. It is appropriate to use NaClO at 1 and 5.25% concentrations for impression disinfection.