Yazar "Ocal, Fikri" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    Effect of antacid gastric syrups on surface properties of dental restorative materials: an in vitro analysis of roughness and microhardness
    (Bmc, 2025) Ocal, Fikri; Dayi, Burak
    Objectives The aim of this in-vitro study was to evaluate the effects of antacid gastric syrups on the surface roughness and microhardness of restorative dental materials. Materials and methods Three different composite resins, nanohybrid, microhybrid and giomer, and four antacid gastric syrups were used in the study. A total of 150 samples were obtained by preparing 50 (10 mm x 2 mm) disk-shaped samples of each composite type. The composites were randomly divided into 5 subgroups and immersed in antacid syrups for 2 min every day for 28 days. The control group samples were kept in distilled water for 28 days. Surface roughness was measured at the beginning, on the 7th, 15th and 28th days using a mechanical profilometer, AFM, and SEM and microhardness was measured using a Vickers device. Shapiro-Wilk, Repeated Measures ANOVA, One-Way ANOVA, Tukey and Games-Howell tests were applied for statistical analysis. Results After 28 days, the surface roughness of the giomer composite decreased significantly (p < 0.05). The surface roughness of microhybrid and nanohybrid composites increased slightly but not significantly (p > 0.05). Microhardness values of microhybrid and giomer composites showed a significant decrease (p < 0.05). SEM and AFM results were in agreement with the mechanical profilometer findings. Conclusion Agents such as calcium carbonate, sodium bicarbonate and magnesium carbonate in antacid gastric syrups can affect the surface properties of restorative dental materials. This may adversely affect the longevity and aesthetics of restorations. Clinical significance The study emphasizes the need for caution in restorative material selection and care protocols in patients using antacid gastric syrups.
  • Küçük Resim Yok
    Öğe
    Effect of passive air exposure and light contact duration on the bond strength and mechanical properties of universal adhesives
    (Elsevier Sci Ltd, 2025) Ocal, Fikri; Onugoren, Nazik Irem; Dayi, Burak; Sarici, Tuba
    Objective This study aimed to evaluate the effects of passive air exposure (no active drying) and light contact time (under D65 light simulating daylight) on adhesive performance. Methods Five universal adhesives (G-Premio Bond [GC], Clearfil Universal Bond [Kuraray], Prime & Bond Universal [Dentsply], OptiBond Universal [Kerr] and Gluma Bond Universal [Kulzer]) were applied to dentin samples after different passive air exposure times (0, 5, 15, 30 s) under standard D65 artificial daylight. Micro-tensile bond strength (mu TBS), fracture distance (Delta L), and elastic modulus (E) were measured. Morphological evaluation of the adhesive interfaces and fracture patterns was performed using scanning electron microscopy (SEM). Statistical analysis included two-way ANOVA to assess the main effects and interactions of adhesive type and exposure time, followed by one-way ANOVA or Kruskal-Wallis tests for group-specific comparisons. Post hoc tests (Tukey, Bonferroni, or Games-Howell) were applied when appropriate. Correlation and regression analyses were also performed. Statistical significance was set at p < 0.05. Results Passive air contact and light exposure significantly affected the mechanical performance of the adhesives. The GPB 30 s group showed the highest bond strength, while the elastic modulus decreased significantly (p = 0.028). The CUB 15 s group exhibited one of the highest elastic modulus values, but the adhesive fracture rate was high in the fracture type (p = 0.007). Correlation analyses showed a strong negative relationship between elastic modulus and fracture distance (r = -0.559/-0.834). SEM images revealed that air bubbles had a negative effect on bond strength. Significance of the study This study guides on the optimal application time for clinical applications by evaluating the effects of air and light exposure time on bonding mechanisms in universal adhesive systems. The findings suggest that adhesive application protocols should be precisely optimized.
  • Küçük Resim Yok
    Öğe
    The Effect of Whitening Toothpastes on Colour Change and Surface Roughness of Restorative Materials
    (Univ Costa Rica, Fac Odontologia, 2023) Dayi, Burak; Ocal, Fikri
    To examine the colour change and surface roughness of giomer, microhybrid composite and nanohybrid composite after brushing with whitening toothpastes. Disc-shaped samples of giomer, microhybrid composite and nanohybrid composite were divided into three subgroups(n=10), with the initial colour measured with a spectrophotometer and the surface roughness measured with a mechanical profilometer. The samples, which were immersed in coffee solution were brushed once a day with whitening toothpastes (Opalescence Cool Mint (OCM), Colgate Optic White Extra Power (COW) and Signal White Now Gold (SWN)) for 12 days. Colour change and surface roughness were measured again after the colouring-brushing cycle. All of the analyses were performed using appropriate statistical hypothesis tests. The highest increase in surface roughness was seen in the microhybrid composite group applied with SWN (p<0.05). The group with the least increase was the giomer group applied with SWN (p<0.05). While the least colour change was observed in the COW applied nanohybrid composite group (Delta E00=1,814), the most colour change occurred in the COW applied giomer group (Delta E00=5.943). After the use of whitening toothpastes, the roughness of giomer, microhybrid composite and nanohybrid composite surfaces was increased and a colour change above the clinically accepted value was observed.
  • Küçük Resim Yok
    Öğe
    Evaluation of the effects of whitening toothpaste containing nanohydroxyapatite on surface roughness and color change in restorative materials
    (Peerj Inc, 2023) Day, Burak; Ocal, Fikri
    Background: The effects of whitening toothpastes containing nanohydroxyapatite on the surfaces of restorative materials are not well known. This study evaluated the changes in surface roughness and color of coffee-stained restorative materials after brushing with nanohydroxyapatite and other whitening toothpastes. Methods: Disc-shaped specimens were formed using microhybrid, nanohybrid, and supra-nano -filled composite (n = 30) and stained with a coffee solution. A brushing simulation was applied with toothpastes containing nanohydroxyapatite (Dentiste Plus White), perlite (Signal White System) and hydrogen peroxide (Colgate Optic White) for 7, 15, and 30 days. Color and surface roughness measurements were taken before and after brushing. Color change (& UDelta;E00) was calculated using the CIEDE2000 system. Results: Supra-nano -filled composite-Dentiste Plus White, supra-nano -filled composite-Colgate Optic White, and nanohybrid composite-Signal White System were the groups with the greatest color change observed on the 7th, 15th, and 30th days, respectively. The smallest color change was seen in the microhybrid composite-Signal White System, microhybrid composite-Dentiste Plus White, and nanohybrid composite-Dentiste Plus White groups on the 7th, 15th, and 30th days, respectively. No significant surface roughness changes were observed in the nanohybrid composite-Dentiste Plus White, supra-nano -filled composite-Colgate Optic White, supra-nano -filled composite-Dentiste Plus White, or supra-nano -filled composite-Signal White System groups. Conclusions: Whitening toothpaste containing nanohydroxyapatite provided a high degree of color change in the short term and did not create significant surface roughness in nanohybrid or supra-nano -filled composites.
  • Küçük Resim Yok
    Öğe
    Impact of restorative treatment for symptomatic deep dentin caries on anxiety: the role of personality traits
    (Bmc, 2025) Ocal, Fikri; Ocal, Yasemin Demirtas
    Objectives This study aimed to examine the short-term effects of restorative treatment for deep dentin caries on patients' pain, state-trait anxiety, and mood, and to explore how these outcomes are associated with personality traits. Methods This prospective clinical study included 67 participants (45 female, 22 male; mean age = 30.1 +/- 13.2 years) presenting with symptomatic deep dentin caries. State and trait anxiety levels were assessed using the State-Trait Anxiety Inventory (STAI-S, STAI-T), and personality traits were evaluated using the Big Five Inventory (BFI-44). Pain and mood were measured using Visual Analog Scales (VAS-DP, VAS-M) before treatment and at three weeks post-treatment. All participants received indirect pulp capping and/or direct composite restorations. Independent-samples t-tests, Paired-samples t-tests, correlation and simple linear regression analyses were used to assess changes and relationships among variables. Results A statistically significant decrease was found in state anxiety (STAI-S), pain (VAS-DP), and mood disturbance (VAS-M) scores post-treatment (p < 0.05). Trait anxiety (STAI-T) did not change significantly. Individuals with high neuroticism displayed higher pre-treatment anxiety and pain levels, but also exhibited the greatest post-treatment improvement in mood and anxiety. Regression analyses indicated that neuroticism significantly predicted both state and trait anxiety (R-2 = 0.139 and R-2 = 0.255, respectively), while pre-treatment anxiety explained 12.7% of the variance in post-treatment state anxiety. Conclusions Restorative treatment of deep dentin caries significantly reduces patients' state anxiety, pain, and mood impairment, with the most marked improvements observed in individuals with neurotic personality traits. Clinical significance Restorative treatment for deep dentin caries not only reduces pain but also alleviates anxiety and improves mood. Considering personality traits, especially neuroticism, may enhance patient comfort and treatment satisfaction. Deep dentin caries Dental pain, Anxiety, Personality traits, Neuroticism
  • Küçük Resim Yok
    Öğe
    Surface Roughness of Restorative Materials After Simulated Toothbrushing with Toothpastes Containing Theobromine and Arginine: An In Vitro Study
    (Univ Indonesia, Fac Dentistry, 2023) Ocal, Fikri; Dayi, Burak; Kucukakcali, Zeynep
    Objective: This study examined the effect of toothpastes containing theobromine and arginine on the roughness changes of microhybrid composite, nanohybrid composite, and giomer restorative materials. Methods: A total of 90 disc-shaped specimens were prepared using microhybrid composite (Arabesk-Ara), nanohybrid composite (Herculite-Her), and giomer (Beautifil II-Gio). The samples were divided into 3 subgroups (n = 10), and initial surface roughness was evaluated with a mechanical profilometer and scanning electron microscopy (SEM). All samples were then subjected to a 1-year brushing simulation via a toothbrushing simulator using toothpastes containing theobromine (Theodent Classic, Theodent) or arginine (Colgate PRO-Relief, Colgate Palmolive); a control group was brushed with distilled water. Afterward, surface roughness measurements and SEM images were re-recorded. The difference in surface roughness was statistically evaluated. Results: The toothpaste containing arginine caused the highest increase in surface roughness in all groups. The toothpaste containing theobromine showed the least increase in roughness in the Her and Gio groups. Conclusion: Using toothpaste containing theobromine causes the least increase in the surface roughness of restorative materials, while using toothpaste containing arginine causes the greatest increase.
  • Küçük Resim Yok
    Öğe
    The Relationship of Aesthetic Dentistry Practices with Depression and Social Appearance Anxiety in Young Women
    (Quintessence Publishing Co Inc, 2024) Ocal, Fikri; Ocal, Yasemin Demirtas
    Purpose: This study aimed to evaluate the relationship between depression and social appearance anxiety in young female patients who applied for aesthetic dental treatment. Methodology: The study was conducted in a single centre and included 56 female patients aged 18-35 years. The mean age of the participants was 22.27 +/- 5.62 years. Participants were informed before treatment, and the Beck Depression Inventory (BDI), Social Appearance Anxiety Scale (SAAS), and Visual Analogue Scale (VAS) were administered. Immediately after the treatment and 1 month later, the SAAS and VAS were administered again. The Kruskal-Wallis test was used for the comparison of the data obtained and the Friedman test was used for temporal comparison. Multiple comparisons were made with Dunn's test. Results: After aesthetic dental treatment, all participants' satisfaction with the appearance of their teeth increased, and social appearance anxiety decreased (p < 0.001). The group with the lowest pretreatment satisfaction level was the group with moderate/high-level depressive symptoms. There was no correlation between the severity of depression and the in-crease in satisfaction after treatment (r = 0.247; p = 0.066). Satisfaction levels were similar in all depression groups after treatment. The group with the highest level of social appearance anxiety before and after treatment was the group with moderate/high-severity depressive symptoms. A moderate positive correlation was found between depression severity and social appearance anxiety (r = 0.4; p = 0.002). Conclusions: The severity of depressive symptoms seen before treatment does not affect the level of satisfaction after treatment. There is a decrease in social appearance anxiety after aesthetic dental treatment. There is a positive relation-ship between social appearance anxiety and depression severity.