Browsing by Author "Celik, Cigdem"

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Clinical Evaluation of Resin-Based Composites in Posterior Restorations: A 3-Year Study
(2014) Celik, Cigdem; Arhun, Neslihan; Yamanel, Kivanc; 25115230
Objectives: The aim of this study was to evaluate the clinical performance of a nanohybrid and a microhybrid composite in class I and II restorations after 3 years. Subjects and Methods: A total of 82 class I and class II restorations were performed in 31 patients (10 males and 21 females) using Grandio and QuiXfil with self-etch adhesives (Futurabond and Xeno III). The restorations were clinically evaluated by 2 operators 1 week after placement (baseline) and at 6 months and 1, 2, and 3 years using modified United States Public Health Service (USPHS) criteria. At the 3-year follow-up, 62 class I and class II cavities were reevaluated in 23 patients (7 males and 16 females). Statistical analysis was performed using Pearson's. 2 and Fisher's exact tests (p < 0.05). Results: At the 6-month follow-up, all restorations received Alfa scores with respect to each evaluation criterion. At the 1-year follow-up, 2 QuiXfil restorations had to be replaced and Grandio restorations started to deteriorate in terms of marginal adaptation. At the end of 2 years, 9 Grandio restorations showed significant deterioration of the surface properties, demonstrating Bravo scores. At the end of 3 years, no significant differences were observed regarding color match, marginal adaptation, secondary caries, marginal discoloration, and anatomic form loss between the evaluated materials in 25 class I and 37 class II restorations. At the 3-year follow-up, Grandio restorations had 21% Bravo scores and showed significant deterioration of the surface properties, which were still clinically acceptable according to USPHS criteria. Three QuiXfil and 1 Grandio restorations were replaced because of secondary caries and loss of retention. Conclusions: Both the nanohybrid (Grandio) and the microhybrid (QuiXfil) composites were clinically functional after 3 years. (C) 2014 S. Karger AG, Basel
Comparison of Microleakage of A Multi-Mode Adhesive System with Contemporary Adhesives in Class II Resin Restorations
(2014) Tuncer, Duygu; Celik, Cigdem; Cehreli, Sevi Burcak; Arhun, Neslihan; https://orcid.org/0000-0002-5936-0196; AAA-1576-2021; AAD-6138-2021; R-2536-2019
Aim: The aim was to compare the microleakage of resin composite bonded with different adhesive systems in class-II cavities at enamel or dentine margins. Material and methods: 60 extracted human molar teeth received slot cavity preparations on mesial and distal surfaces (mesial cervical margin was prepared in enamel and distal in dentine). They were randomly divided into five groups (n=12) according to the adhesive system: Group-A: Silorane Bond (S), Group-B: Adper Single Bond 2 (SB), Group-C: Clearfil SE Bond (CSE), Group-D: Single Bond Universal (USel) (selective etch-and-rinse), Group-E: Single Bond Universal (USE) (all-in-one). The preparations were restored using the same resin composite (Filtek Ultimate) except Group A which was restored by Silorane composite. The teeth were thermocycled, immersed in dye, sectioned, and dye penetration was evaluated quantitatively using image analysis. The data were analyzed using the two-way analysis of variance and Bonferroni test. Results: In all groups, there was no statistically significant difference between enamel margins at occlusal and gingival sites (p>0.05). The statistical difference between Group-A (S) and Group-B (SB) was significant at all margins. Group-B (SB) presented the greatest microleakage amounts at all margins and the highest scores were obtained in the dentine. Likewise, SB demonstrated statistically significant differences between dentine and enamel margins (occlusal and gingival)(p<0.05). Conclusion: All adhesive systems showed similar microleakage values between enamel margins in occlusal and gingival regions. However, when the gingival margin is located in the dentine, etch&rinse adhesive systems may not be a choice in terms of microleakage prevention.
Dental Anxiety and Fear: Relationship with Oral Health Behavior in a Turkish Population
(2014) Yozugullu, Bulem; Gulsahi, Ayse; Celik, Cigdem; Bulut, Sule
The aim of this study was to assess fear and anxiety in dental patients. Five hundred patients were evaluated using the Modified Dental Anxiety Scale and the Dental Fear Scale, along with a questionnaire. Oral health status was assessed using the Decayed, Missing, and Filled Teeth (DMFT)/Decayed, Missing, and Filled Surfaces (DMFS) index. Statistic al analysis was performed (P <.05). Sex significantly affected dental anxiety (P <.05), and sex, marital status, having children, and time elapsed since last visit to clinician affected dental fear (P <.05). DMFT/DMFS scores were not related to dental anxiety or fear (P >.05). Female sex alone was a significant predictor of dental anxiety; female sex, adulthood, marriage, having children, and time passed since last visit to a clinician are significant predictors of fear.
Dental Anxiety and Fear: Relationship with Oral Health Behavior in a Turkish Population
(2014) Yozugullu, Bulem; Gulsahi, Ayse; Celik, Cigdem; Bulut, Sule; https://orcid.org/0000-0002-5936-0196; 24392477; AAA-1576-2021; AAC-5448-2020
The aim of this study was to assess fear and anxiety in dental patients. Five hundred patients were evaluated using the Modified Dental Anxiety Scale and the Dental Fear Scale, along with a questionnaire. Oral health status was assessed using the Decayed, Missing, and Filled Teeth (DMFT)/Decayed, Missing, and Filled Surfaces (DMFS) index. Statistic al analysis was performed (P <.05). Sex significantly affected dental anxiety (P <.05), and sex, marital status, having children, and time elapsed since last visit to clinician affected dental fear (P <.05). DMFT/DMFS scores were not related to dental anxiety or fear (P >.05). Female sex alone was a significant predictor of dental anxiety; female sex, adulthood, marriage, having children, and time passed since last visit to a clinician are significant predictors of fear.
Dental Students' Ability to Assess Their Performance in a Preclinical Restorative Course: Comparison of Students' and Faculty Members' Assessments
(2015) Tuncer, Duygu; Arhun, Neslihan; Yamanel, Kivanc; Celik, Cigdem; Dayangac, Berrin; 0000-0002-5936-0196; 26034030; R-2536-2019; AAA-1576-2021
Dental education consists of both theoretical and practical learning for students to develop competence in treating patients clinically. When dental students encounter practical courses in their first year as a new educational experience, they must also learn to evaluate themselves. Self-evaluation is an essential skill to learn for dental professionals to keep increasing their competence over the course of their careers. The aim of this study was to compare the assessment scores of second- and third-year dental students and the faculty in two consecutive preclinical practical exams in restorative dentistry courses in a dental school in Turkey. Faculty- and student-assigned scores were calculated from two consecutive preclinical examinations on tooth restorations performed on both artificial casts and phantom patients. The students were formally instructed on grading procedures for tooth preparations, base and restoration placement, and polishing criteria. After each step, each item was assessed by faculty members, the student, and another student. The results indicated that the initial differences between second-year students' assessments of their own preclinical practical ability and that of the faculty decreased among the third-year students. Self-evaluation scores did not indicate whether the third-year students tended to over- or underestimate the quality of their own work. However, the second-year students not only overestimated themselves but thought they were above average. The results point to the need to develop students' self-insight with more exercises and practical training.
The effect of dentin desensitizers, and Nd:YAG laser pre-treatment on microtensile bond strength of self-adhesive resin cement to dentin
(2014) Acar, Ozlem; Tuncer, Duygu; Yuzugullu, Bulem; Celik, Cigdem
PURPOSE. The purpose of this study is to evaluate if pre-treatment with desensitizers have a negative effect on microtensile bond strength before cementing a restoration using recently introduced self-adhesive resin cement to dentin. MATERIALS AND METHODS. Thirty-five human molars' occlusal surfaces were ground to expose dentin; and were randomly grouped as (n=5); 1) Gluma-(Glutaraldehyde/HEMA) 2) Aqua-Prep F-(Fluoride), 3) Bisblock-(Oxalate), 4) Cervitec Plus-(Clorhexidine), 5) Smart protect-(Triclosan), 6) Nd:YAG laser, 7) No treatment (control). After applying the selected agent, RelyX U200 self-adhesive resin cement was used to bond composite resin blocks to dentin. All groups were subjected to thermocycling for 1000 cycles between 5-55 degrees C. Each bonded specimen was sectioned to microbars (6 mm X 1 mm X 1 mm) (n=20). Specimens were submitted to microtensile bond strength test at a crosshead speed of 0.5 mm/min. Kolmogorov-Smirnov, Levene's test, Kruskal Wallis One-way Analysis of Variance, and Conover's nonparametric statistical analysis were used (P<.05). RESULTS. Gluma, Smart Protect and Nd:YAG laser treatments showed comparable microtensile bond strengths compared with the control group (P>.05). The microtensile bond strengths of Aqua-Prep F, and Cervitec Plus were similar to each other but significantly lower than the control group (P<.05). Bisblock showed the lowest microtensile bond strength among all groups (P<.001). Most groups showed adhesive failure. CONCLUSION. Within the limitation of this study, it is not recommended to use Aqua-prep F, Cervitec Plus and Bisblock on dentin when used with a self-adhesive resin cement due to the decrease they cause in bond strength. Beside, pre-treatment of dentin with Gluma, Smart protect, and Nd:YAG laser do not have a negative effect.
Effect of different denture cleansers on surface roughness and microhardness of artificial denture teeth
(2016) Yuzugullu, Bulem; Acar, Ozlem; Cetinsahin, Cem; Celik, Cigdem; 27826382
PURPOSE. The aim of this study was to compare the effects of different denture cleansers on the surface roughness and microhardness of various types of posterior denture teeth. MATERIALS AND METHODS. 168 artificial tooth specimens were divided into the following four subgroups (n=42): SR Orthotyp PE (polymethylmethacrylate); SR Orthosit PE (Isosit); SR Postaris DCL (double cross-linked); and SR Phonares II (nanohybrid composite). The specimens were further divided according to the type of.the denture cleanser (Corega Tabs (sodium perborate), sodium hypochlorite (NaOCl), and distilled water (control) (n=14)) and immersed in the cleanser to simulate a 180-day immersion period, after which the surface roughness and microhardness were tested. The data were analyzed using the Kruskal Wallis test, Conover's nonparametric multiple comparison test, and Spearman's rank correlation analysis (P<.05). RESULTS. A comparison among the denture cleanser groups showed that NaOCl caused significantly higher roughness values on SR Orthotyp PE specimens when compared with the other artificial teeth (P<.001). Furthermore, Corega Tabs resulted in higher microhardness values in SR Orthotyp PE specimens than distilled water and NaOCl (P<.005). The microhardness values decreased significantly from distilled water, NaOCl, to Corega Tabs for SR Orthosit PE specimens (P<.001). SR Postaris DLC specimens showed increased microhardness when immersed in distilled water or NaOCl when compared with immersion in Corega Tabs (P<.003). No correlation was found between surface roughness and microhardness (r=0.104, P=.178). CONCLUSION. NaOCl and Corega Tabs affected the surface roughness and microhardness of all artificial denture teeth except for the new generation nanohybrid composite teeth.
The Effect of Different Polishing Sequences on the Adhesion of Streptococcus mutans to Feldspathic Porcelain
(2016) Yuzugullu, Bulem; Celik, Cigdem; Ozcelik, Tuncer Burak; Erkut, Selim; Yurdakul, Pinar; Ocal, Yesim; Sener, Burcin; https://orcid.org/0000-0002-5936-0196; AAA-1576-2021
The aim of this research was to determine whether extra-oral surface treatments on feldspathic porcelain surfaces influence initial adhesion of Streptococcus mutans. Ninety-six porcelain specimen discs were fabricated and divided into six equal groups according to surface treatment: fine-grit diamond polishing (Group 1); self-glazing (Group 2); overglazing (Group 3); overglazing followed by a finishing procedure and then overglazing (Group 4); Pearl Surface polishing (Group 5); and Diamond Twist SCLTM polishing (Group 6). Surface roughness and hydrophobicity were assessed. An S. mutans suspension was incubated on each specimen group and evaluated. A one-way analysis of variance, post-hoc Tukey honestly significantly different test, Friedman test, and t-test were used for statistical analysis. Group 1 showed the highest surface roughness (p < 0.001) and bacterial adhesion (p < 0.05). Groups 5 and 6 specimen surfaces presented significantly higher contact angles (p < 0.05). Group 1 had the highest S. mutans adhesion, followed by Groups 3, 5, 6, 2, and 4 (p < 0.05). Reglazing after grinding may therefore decrease bacterial adhesion beneficially.
Microtensile Bond Strength of Composite-to-Composite Repair with Different Surface Treatments and Adhesive Systems
(2014) Celik, Cigdem; Cehreli, Burcak Sevi; Bagis, Bora; Arhun, Neslihan; https://orcid.org/0000-0002-5936-0196; AAA-1576-2021; R-2536-2019
Objectives: The purpose was to investigate the effect of different surface treatments and bonding agents on the repair bond strength of different resin-based restorative materials by microtensile bond strength (TBS) testing protocol. Materials and Methods: 24 Grandio SO(VOCO) and 24 Filtek Z250(3M) resin composite blocks were prepared. Half of the samples (N=12) were diamond bur-roughened and the other half (N=12) were sandblasted by 50m aluminum oxide particles. They were further divided into four sub-groups (n=3) and received the following: Sub-Group1: Adper Single Bond2 (Etch&Rinse) (3M); Sub-Group2: Clearfil SE (Self-etch) (Kuraray); Sub-Group3: Beauty Bond (HEMA-free all-in-one) (Shofu); Sub-Group4: All Bond3 (HEMA-free, hydrophobic, etch&rinse) (Bisco). The samples were repaired by Filtek Z250 to form a block. All of the resultant sub-groups combinations consisted of one of the composite type, surface treatment type, and adhesive systems. A total of 18 groups were prepared including 2 homogeneous blocks. They were thermocycled and TBS measurements were performed. Data were statistically analyzed with Kruskall-Wallis and Mann-Whitney U tests. Results: The experimental regroups' TBS reached to 34.67-66.36% and 43.44-95.52% of the cohesive bond strength for Grandio SO and Z250, respectively. The pre-existing composite type is found to be statistically important. When the surface is bur-finished Grandio performed better; when air-abrasion is considered Z250 showed higher bond strength. All-in-one adhesive system produced the weakest bond strength at all parameters. Conclusion: It may be suggested that when the pre-existing composite is unknown, air-abrasion may be performed with etch&rinse or two-step self-etch adhesives.
Turkish Adaptation of Dentine Hypersensitivity Experience Questionnaire (DHEQ)
(2018) Basaran, Saffet; Celik, Cigdem; 0000-0002-5936-0196; 29369544; AAA-1576-2021
Objective: The Dentine Hypersensitivity Experience Questionnaire (DHEQ) is a valid and reliable instrument for oral health-related quality of life (OHRQoL) studies. This study aimed to assess the Turkish version of the DHEQ and determine the effects of degree of DH, sex, and age on OHRQoL. Materials: The study participants were 251 DH patients (age 18-78 years; 68.5% female) who completed the Turkish version of the DHEQ. The reliability of the instrument was assessed in terms of internal consistency, using item-total correlations and Cronbach's alpha and test-retest reliability using intra-class correlation coefficients (ICCs) among 51 patients who repeated the DHEQ following a 2-week interval. Construct validity was determined based on exploratory factor analysis (EFA). Convergent validity was tested through correlating DHEQ total and subscale scores with the global rating of oral health and effect on life overall. Discriminative validity was tested by comparing the total and subscale scores against the degree of sensitivity. Results: Patients with more severe hypersensitivity showed higher DHEQ scores and greater OHRQoL impairment. Female and older (>40 years) patients had significantly greater OHRQoL impairment. Cronbach's alpha exceeded 0.70, indicating good internal consistency reliability. The ICC values were >0.60 for the overall scale and each subscale of the DHEQ, signifying good to excellent test-retest reliability. Conclusion: The results suggested that the Turkish version of the DHEQ is appropriate for assessing the OHRQoL among people with dentine hypersensitivity.