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    The effect of periodontal prophylaxis procedures on the surface properties of tooth-colored restorative materials
    (Iop Publishing Ltd, 2022) Acikgoz-Alparslan, Ece; Buyukgoze-Dindar, Mediha; Tekbas-Atay, Meltem
    This study aimed to investigate the effect of various periodontal hygiene procedures on the surface properties of direct and indirect restorative materials. Disc-shaped specimens (10 x 2 mm) of FC: Flowable Composite, UC: Universal Composite, IC: Indirect Composite, CC: CAD/CAM Composite were fabricated (n = 70) and divided randomly into subgroups: 1-Control, 2-US: Ultrasonic scaling, 3-RP: Rubber-cup polishing, 4-AP: Air-polishing, 5-US+RP, 6-US+AP, 7-US+AP+RP. The color, surface roughness, and gloss measurements were performed. Data were analyzed with variance analysis and the correlation coefficient was used to evaluate the relationship between surface properties (p < 0.05). The highest and lowest roughness values were obtained in FC after US and CC's control group, respectively. The surface roughness of FC, IC, and CC was significantly affected by the application of various prophylaxis procedures (p < 0.05). AP and US+AP+RP presented the least and most affected surface roughness, respectively. The lowest surface gloss value was in the US and RP subgroups of FC. The process that the least reduced the surface gloss was AP. Material and procedure affected the color stability (p < 0.05) except for CC. The highest Delta E values were obtained in US+AP+RP subgroups. Indirect restorative materials showed less roughness and color change as well as higher gloss values after all periodontal prophylaxis procedures. The use of air-polishing has proven to be a reliable periodontal hygiene approach for direct and indirect restorations due to the less deterioration in the surface properties.
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    Effect of surface conditioning methods on the microtensile bond strength of repair composite to indirect restorative materials
    (Taylor & Francis Ltd, 2019) Mumcu, Emre; Erdemir, Ugur; Ozsoy, Alev; Tekbas-Atay, Meltem; Oezcan, Mutlu
    This study evaluated the effect of surface conditioning methods on the microtensile bond strength (mu TBS) of a restorative composite to indirect restorative materials. Blocks (5 x 5 x 4 mm(3)) (N = 72) of (a) Zirconia (In-Ceram Zirconia, Vita) (ZR), (b) lithium disilicate glass ceramic (IPS Empress II, Ivoclar Vivadent) (LD), (c) Indirect resin composite (Gradia, GC) (GR) were fabricated (n = 24 per group) and divided randomly into three groups: 1-Control: no conditioning, 2-Silane coupling agent, 3-Hydrofluoric acid (9.5%) (HF)+silane. Each block was duplicated in resin composite. The adhesion surfaces were conditioned with airborne-particle abrasion (110 mu m Al2O3 particles). Half of the conditioned blocks received no bonding and the other half one coat of bonding (ED Primer II, Kuraray). Each conditioned block was bonded to a composite block with a resin luting agent (Panavia F2.0, Kuraray). The blocks were sectioned into 1 mm(2) microsticks and tested for microtensile bond strength (mu TBS) (0.5 mm/min) in a mu TBS testing machine. Failure types were evaluated under stereomicroscope and Scanning Electron Microscope (SEM). Data were analyzed using three-way ANOVA, Bonferroni corrected and independent sample t-tests (p < 0.05). Significant effect of the bonding (p < 0.001) and surface conditioning (p < 0.001) were observed in all groups. The highest mean bond strength values were obtained in the bonded, HF etched and silanized groups of ZR, LD and GR (12.4 +/- 2.9, 28.1 +/- 1.5 and 27.2 +/- 2 MPa, respectively). HF acid + silane increased the repair bond values in all materials. Majority of the failure types were adhesive for ZR group, whereas HF + silane conditioned LD and GR groups presented predominantly cohesive failures in the cement.
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    nZ Prevalence of Dental Anomalies Assessed Using Panoramic Radiographs in a Sample of the Turkish Population
    (Quintessence Publishing Co Inc, 2022) Buyukgoze-Dindar, Mediha; Tekbas-Atay, Meltem
    Objective: To determine the prevalence, frequency and distribution of dental anomalies that were detectable on panoramic radiographs in a large sample Turkish population, and the associations among the anomalies.Methods: This study was conducted retrospectively on panoramic radiographs of 43,880 patients who were admitted to the Faculty of Dentistry at Trakya University, Edirne, Turkey. Patients 'files were examined by two observers and radiographic images of2265patients with at least one dental anomaly were included. Dental anomalies were classified as anomalies in the number, structure, position and shape of teeth. The interactions between the groups were analysed using chi-square tests.Results: The study group consisted of 1336women (59%) and 929 men (41%) with a mean age of 33.3 +/- 14.4 years. A total of 2265 patients, with a prevalence of 5.2% (2265/43880), had at least one dental anomaly. The most frequent anomalies were in position (2.7%) and number (2.1%). Structure anomalies were least common, affecting 0.02% ofpatients. Among the study group ofpatients with dental anomalies, 12.2% presented more than one kind of anomaly.Conclusion: Position anomalies were the most common dental anomaly, whereas struc-tural anomalies were least common in a Turkish sample. The prevalence of anomalies varies between populations, confirming the role of racial factors.
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    Radiographic Evaluation of Marginal Bone Height and Density Around Overhanging Dental Restorations
    (Quintessence Publishing Co Inc, 2022) Dindar, Mediha Buyukgoze; Acikgoz-Alparslan, Ece; Tekbas-Atay, Meltem
    This study aimed to investigate the marginal bone changes beneath overhanging restorations. The study group consisted of 250 archived panoramic radiographs that had at least one overhanging restoration, examined by two observers. The distance from the cementoenamel junction (CEJ) to the marginal bone crest beneath the overhang was measured with lmageJ software. The same distance was measured from the control sites (the intact surface of the same tooth with overhang, and the same tooth on the contralateral side) to assess bone loss. To evaluate bone density, two regions of interest (ROls) were chosen: one in the marginal bone beneath the overhang, and the other was in the marginal bone adjacent to the intact surface of the same tooth. Wilcoxon paired t test and Mann-Whitney U test were used for comparisons (P < .05). The prevalence of overhangs was 4.3%. Molar teeth (80.8%) and the disto-ocdusal cavities (54%) were the most common sites for overhangs. The average bone loss beneath the overhangs was 2.77 +/- 1.20 mm, which was significantly different from the control sites (P < .05). The bone density beneath the overhang was significantly lower than at control sites (P < .05). The frequency of overhangs was higher in areas that are difficult to reach, and the height and density of the marginal bone beneath the overhang were decreased compared to control sites.
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    Surface deterioration of resin composites and enamel after toothbrush simulation with new and used toothbrushes
    (Mosher & Linder, Inc, 2024) Dindar, Mediha Buyukgoze; Tekbas-Atay, Meltem
    Purpose: To investigate the effect of toothbrushing with new and used toothbrushes on the surface of resin composites and dental enamel. Methods: The extracted human incisors were selected after vestibular enamel surfaces (ES) were examined. Disc-shaped specimens of direct composite (DC) and indirect composite (IC) were fabricated. Computer-aided design-computer-aided manufacturing (CAD-CAM) composite blocks (CC) were sliced in 2 mm thickness (n= 8). The surface roughness, gloss, and color were measured. The measurements were performed before and after 3 months of toothbrushing simulation (TBS) for 2,500 circular cycles. The wear index was calculated by using the ImageJ program. The specimens were subjected to an additional 2,500 cycles and the same measurements were repeated. Results: No significant increase in surface roughness values was observed in DC, IC, and CC groups after 3 and 6 months of TBS except in the ES group. The highest change in surface gloss was observed in the DC group. Although the wear index of toothbrushes increased over time, only the increase in the IC group was statistically significant (P= 0.033).