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Now showing 1 - 8 of 8
  • PublicationOpen Access
    Impact of a Surface Sealant Application on the Color Stability of a Nano-hybrid Composite Resin
    (2021-12-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Dönmez, Nazmiye; Kahya, Deniz Selin; Hergüner Siso, Şeyda; SARIALİOĞLU GÜNGÖR, AYÇA; DÖNMEZ, NAZMİYE
    Objective: Mouthwashes containing chlorhexidine can cause discoloration in restorative materials when used for the long-term. To prevent staining of a restorative material, several protective materials are used. The aim of this in vitro study was to evaluate the impact of a surface sealant on the color stability of a nano-hybrid composite resin material immersed in different mouthwashes. Methods: A total of 42 composite resin discs (10x2 mm) were prepared with a nano-hybrid composite resin (Herculite XRV Ultra) using Teflon moulds. The composite specimens were first divided into two groups (with or without a surface sealant) then into three subgroups (n=7) according to the mouthwashes (Gengigel, Oderol, and Chlorhex). After SS application to 21 specimens, all the discs were subjected to baseline color measurements using a spectrophotometer according to the Commission Internationale de l’Eclairage L*a*b* system. The specimens underwent thermal cycling. Following immersion in different mouthwashes for 24 hours, the color measurements were repeated. The ∆E data were assessed using Kruskal-Wallis one-way ANOVA. Mann-Whitney U test was performed for different immersion mouthwashes (p<0.5). Results: Statistically significant differences (p<0.5) were found between the unsealed composite specimens immersed in Chlorhex and the other mouthwashes in terms of ∆E values. The Chlorhex appeared to be associated with the most severe alteration in color (5.14±0.83), followed by Gengigel (2.21±1.46) and Oderol (1.94±1.75). There were no statistically significant differences (p>0.05) between the sealed and unsealed composite specimens in terms of the color changes. Conclusion: The application of a low viscosity liquid surface sealant material did not show the expected effect on the color stability of a nano-hybrid composite resin in terms of three different mouthwashes.
  • PublicationMetadata only
    Influence of Etching Mode and Composite Type on Bond Strength to Biodentine Using a -No-Wait- Universal Adhesive
    (2021-07-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Alim, Betül Aycan; SARIALİOĞLU GÜNGÖR, AYÇA; UYSAL, BETÜL AYCAN
  • PublicationOpen Access
    Perceptions of dental students towards online education during the COVID-19 pandemic
    (2021-12-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Şeşen Uslu, Yeşim; SARIALİOĞLU GÜNGÖR, AYÇA; DÖNMEZ, NAZMİYE
    Purpose: This study evaluated the usage habits, attitudes, and perceptions of undergraduate dental students toward distance (online) learning and identified variables related to those attitudes. Materials and methods: The study included 1,605 undergraduate dental students who participated voluntarily. The data collection tool consisted of a distance learning attitude scale, a questionnaire on personal information, and open-ended questions. The perceptions of dental students to distance education according to the year and type of dental school they attended were evaluated. Results: Most students expressed that distance learning in dental courses was not as effective as traditional face-to-face education (59.1%, n=949). While students studying at state universities had a more negative view of distance education, the satisfaction scores of the first-year students were found to be significantly lower than the other students (p<0.05). Conclusion: Dental students were generally unhappy with the interruption of traditional education caused by COVID-19 and having to continue their education online. However, under the circumstances, they saw it as an advantage allowing them to continue their education and avoid a complete suspension.
  • PublicationMetadata only
    The Effect of Whitening Dentifrices on the Surface Roughness of Different Composite Resins
    (2021-04-22T00:00:00Z) Şeşen Uslu, Yeşim; Doğruer, Işıl; Sarıalioğlu Güngör, Ayça; Ulukapı, Haşmet; SARIALİOĞLU GÜNGÖR, AYÇA
    Aim: The aim of this in-vitro study was to evaluate surface roughness (SR) of two different composite resins after toothbrushing with different whitening toothpastes.Materials and Methods: Filtek Z250 universal composite resin (3M) (3M ESPE, St. Paul, MN, USA) containing bis-GMA and Charisma Topaz (CT) nano-hybrid composite resin (Heraeus Kulzer, Wehrheim, Germany) without bis-GMA were used in the study. 50 disc-shaped specimens of 10 mm in diameter and 2 mm in thickness were prepared from each composite. The prepared discs were kept at 370C for 24 hours and then separated in 5 subgroups: G1 control (artificial saliva) group, G2 Colgate Optical White Active Charcoal (containing active carbon), G3 Yotuel (containing carbamide peroxide), G4 Opalescence (containing abrasive particle), and G5 Sensodyne, Promine (containing fluoride) pastes (n = 10).After initialmeasurements and SR1 values were recorded.The discs were brushed in continuous mode with an electric toothbrush (Triumph Professional Care, Oral B Braun GmbH, Kronberg / Ts., Germany) in a slurry (1:3 g/ml) of the tested toothpastes (1.5 N). Samples were brushed twice a day for 4 weeks and 8 weeks to mimic the daily routine. Samples were conserved in artificial saliva between brushing cycles. After 4 weeks and 8 weeks cycles, SR2 and SR3 values were recorded. The obtained data were analyzed by three-way mixed ANOVA.Results: There were no statistically significant differences between the two composite resin materials (p=0.575). When the whitening dentifrices groups were compared f o r both ma t e r i a l s , there was no statistical difference after 4 weeks and 8 weeks. The SR value of the control groups (0,948 ± 0,118 3M, 1,006 ± 0,187 CT) were significantly lower than the Charcoal groups (1,672 ± 0,314 3M, 1,653 ± 0,265 CT) at the end of 8 weeks (p<.05).Conclusion: After simulated brushing with whitening toothpastes, similar degree of roughness was observed on the composite resins tested.Keywords: surface roughness, toothbrushing, whitening toothpaste, resin composite
  • PublicationMetadata only
    Türkiye-deki Diş Hekimleri ve Hastaların Tele-Diş Hekimliğine İlişkin Bilgi ve Farkındalıklarının Değerlendirilmesi
    (2021-10-07T00:00:00Z) Özveren, Neslihan; Sevinç, Büşra; Sarıalioğlu Güngör, Ayça; Baltacı, Ezgi; Özgür, Özge; SARIALİOĞLU GÜNGÖR, AYÇA
  • PublicationOpen Access
    Knowledge, stress levels, and clinical practice modifications of Turkish dentists due to COVID-19: a survey study
    (2021-03-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Dönmez, Nazmiye; Uslu, Yeşim Şeşen; SARIALİOĞLU GÜNGÖR, AYÇA; DÖNMEZ, NAZMİYE
    Dentists are exposed to the highest risk of occupational respiratory and droplet infections by working face-to-face with patients. The aim of this study was to investigate the knowledge of symptoms and modes of transmission of COVID-19, stress levels and clinical practice modifications of Turkish dentists during the COVID-19 pandemic. An online survey (15 questions) was sent to Turkish dentists from May 5 to 12 May, 2020. The survey comprised questions about dentists’ demographic characteristics, their knowledge about COVID-19, stress levels and the measures taken in dental clinics against COVID-19. This study included a total of 1,095 Turkish dentists. The data were expressed as frequency with percentage values for overall variables. Dentists were most familiar with high fever among the symptoms of COVID-19 (99.4%) and 99.2% of them reported that COVID-19 was transmitted with eye, mouth and nasal mucosa contact on surfaces contaminated with the droplets of infected persons. While the stress levels of females were higher than males, the stress levels of dentists with more than 20 years of professional experience were found to be lower. Regarding the precautions to be taken as a preventive measure when working again, 86.6% of the dentists took precautions by increasing daily patient care intervals and only 38.4% of the dentists wore an N95 mask. During this pandemic, knowing the conditions about when the treatments can be applied and the precautions to be taken will shed light on dentistry staff. Current recommendations of national authorities about the coronavirus should be followed.
  • PublicationMetadata only
    Effects of Vitamin C on Surface Roughness, Microhardness and Color Stability of Composite Resins
    (2021-09-16T00:00:00Z) Sarıalioğlu Güngör, Ayça; Değer, Ceren; SARIALİOĞLU GÜNGÖR, AYÇA
    Objectives: The study assessed the changes in color stability, surface roughness and microhardness of three esthetic composite-resin materials after immersed in different effervescent vitamin C tablets.Methods: Three different types of composite resins were investigated: supra-nano hybrid composite, microfilled hybrid composite, and nanofilled composite resins. Ninety disc-shaped specimens (4-mm diameter, 2-mm thickness) were fabricated using Teflon mold and divided into three groups according to the immersion solution (Redoxon, Sambucol, and distilled water as control) for both composite resins (n=10). The top surface of specimens was ground with 600 grit silicon carbide paper for the standardization. Each group was immersed in the solutions for 24 hours. Surface roughness (Ra, mm) was measured by contact profilometer, while the hardness was measured by Vickers hardness (HV) test. CIE L*a*b* coordinates were recorded by using spectrophotometer and color difference analysis (ΔE) was made using the CIEDE-2000 formula. Data were statistically analyzed using two-way ANOVA and Bonferroni correction test (p<0.05).Results: No significant differences in surface roughness change were recorded according to the immersion solutions for both composite resin groups (p>0.05). However, there were significant differences in ΔHV of all composite resins among the control group and the effervescent vitamin C tablets (p<0.001). Highest microhardness decrease was obtained in supra-nano hybrid composite specimens when immersed in Redoxon (-8.49±1.62). Statistically significant differences (p<0.001) were found between the composite specimens immersed in the solutions in terms of ΔE values. Redoxon appeared to be associated with the most severe alteration in color (4.86±0.63).Conclusions: Using vitamin C effervescent tablets did not have a significant change in the surface roughness values of the composite resins. However, microhardness values of all composite resin specimens were reduced. Clinically unacceptable discoloration was observed only in micro-filled hybrid composite specimens immersed in Redoxon.
  • PublicationOpen Access
    Effect of Trichloroacetic Acid on the Bond Strength of Calcium Silicate-Based Cements: A Modified Push-Out Test
    (2021-10-01T00:00:00Z) Alim, Betül Aycan; Sarıalioğlu Güngör, Ayça; UYSAL, BETÜL AYCAN; SARIALİOĞLU GÜNGÖR, AYÇA
    Objective: This study aimed to investigate the effect of trichloroacetic acid (TCA) on the bond strength of calcium silicate-based cements to dentin. Methods: Ten single-rooted bovine teeth were sectioned longitudinally into slices 2 mm thick. Six holes were drilled with a 1.2 mm diamond bur in each dentin slice (totally 60 holes). Cotton pellets with TCA were applied to three holes of each slice for 1 min, whereas no acid was applied to the other three. The TCA and non-TCA groups were divided into three subgroups according to the material used: ProRoot mineral trioxide aggregate [(MTA); n=10], Harvard MTA (n=10), and Biodentine (n=10). After seven days, the dislodgement resistance of the materials was calculated using a universal resting machine The types of bond failure were examined under a stereomicroscope. Results: The TCA had no statistically significant effect on the bonding strength of the tested materials (p>0.05). The Harvard MTA subgroup had the lowest mean bond strength values (2.25 +/- 0.79 MPa), while the Biodentine subgroup had the highest (10.49 +/- 3.32MPa). The most common bond failure types were mixed in the ProRoot MTA subgroup (60%) and cohesive in the Harvard MTA (60%) and Biodentine (70%) subgroups. Conclusion: The bond strength of Biodentine is greater than those of ProRoot and Harvard MTA. TCA does not affect the push-out bond strength of MTA or Biodentine.