Nurhan Öztaş

A histopathologic study of direct pulp-capping with adhesive resins

OBJECTIVE The purpose of this study was to evaluate the histologic pulp responses of Optibond and Syntac adhesive resin systems placed directly on exposed pulp tissues. STUDY DESIGN Class V facial cavities with pulpal exposures were prepared in dogs. After acid etching of enamel margins, the cavities were restored with a composite resin after pulp-capping with one of the dentin bonding agents. The remaining exposures were capped with calcium hydroxide and amalgam as controls. The animals were killed after 7, 21, and 90 days and the pulps were evaluated histologically. Statistical analysis was carried out with the chi-square test. RESULTS There was no statistically significant difference with respect to inflammatory cell response, fibrosis, bleeding, or bacterial staining criteria over the time intervals of evaluation among the Optibond, Syntac, and calcium hydroxide groups. New dentin formation was also observed for all of the groups at the end of 90 days. CONCLUSION The results of direct pulp-capping with a dentinal adhesive and composite resin appear promising but further in vivo studies are recommended.

Salivary and Urinary Fluoride Levels after 1-Month Use of Fluoride-Releasing Removable Appliances

Forty children aged 8-10 years participated in this study. Half (n =20) of them used orthodontic appliances which contained fluoride-releasing devices embedded in the lingual surface of the appliance and the other half used orthodontic appliances prepared from a fluoride-releasing acrylic polymer. Prior to the adjustment of appliances and after 1, 7, 14, 21 and 30 days salivary and urinary samples were collected and the fluoride concentrations were determined. The mean fluoride release was highest during the first week. However, the values decreased considerably after that and the curves for the two groups became parallel. The results indicate that fluoride-releasing removable appliances could be useful for a prolonged release of low concentrations of fluoride without any systemic effect.

Comparing the antibacterial activity of gaseous ozone and chlorhexidine solution on a tooth cavity model

Objective: To evaluate the antibacterial activity of gaseous ozone and chlorhexidine solution on a tooth cavity model. Study Design: Twenty-one human molars were divided into 3 groups. Cavities were then cut into the teeth (4 per tooth, 28 cavities per group). After sterilization, the teeth were left in broth cultures of 106 colony-forming units (CFU) ml-1 of Streptococcus mutans (S. mutans) at 36°C for 48 h. The appropriate treatment followed (group A, control; group B, 2% chlorhexidine solution; and group C, 80s of treatment with ozone, and the cavities were then filled with composite resin. After 72h, the restorations were removed, dentin chips were collected with an excavator, and the total number of microorganisms was determined. Results: Both of the treatments significantly reduced the number of S. mutans present compared with the control group and there was a significant difference between the all groups in terms of the amount of the microorganisms grown (p < 0.05). Group B was beter than group C; and group C was better than group A. Moreover, it was found that the amount of the growth in the group of chlorhexidine was significantly less than that of the ozone group (p < 0.05). Conclusion: Chlorhexidine solution was the antibacterial treatment most efficacious on S. mutans; however, ozone application could be an anlternative cavity disinfection method because of ozone’s cavity disinfection activity. Key words:Antibacterial activity, chlorhexidine, ozone, streptococcus mutans, tooth cavity.

Why parents prefer university clinic for pedodontic treatment? Effect of caries/orthodontic treatment/trauma, education and media: A cross-sectional study

The aim of this study is to determine why parents prefer university clinics for pedodontic treatment, as well as describe caries, orthodontic treatment, trauma, education, and the media effect. A five-item, questionnaire-based, cross-sectional interview study was administered face-to-face to a nationally representative sample in Turkey in 2013 by the Gazi University, Department of Pediatric Dentistry. The researchers recorded the parents′ educational status, reasons for referral, and the children′s age and sex. A Chi-square test was used for the categorical variables. The continuous variables were compared using a Mann-Whitney U-test and a Kruskal-Wallis test in 90% confidence interval of ΁3%. A total of 572 patients and their parents agreed to participate in this study. Question 1: Statistically significant difference was found between parents educational status. Question 2: Increased education status led to increased confidence in academic facilities (P < 0.05). Question 3: Just for over the 16 years education status has found significantly a low concern (P < 0.05). Question 4: Only for over the 16 years education status was found significant information via media sources (P < 0.05). Question 5: 56.6% said dentists should provide more information. Media sources are gaining importance and status for educating the public information source in pedodontic treatment. The increasing status of education showed a significant difference for confidence in academic facilities.

DÖRT FARKLI FLUORİD SALINIMI YAPAN RESTORATİF MATERYALDEN FLUORİD EMİLİMİNİN SIĞIR MİNESİNDE DEĞERLENDİRİLMESİ: İN VİTRO ÇALIŞMA

Aim: The aim of this study was to compare the fluoride uptake from four different of fluoride releasing restorative materials by bovine enamel and to determine the effect of time on this uptake. Material and Method: A glass ionomer cement (Fuji II), resin-modified glass ionomer cement(Fuji II LC), giomer (Beautifil) and compomer (Dyract AP) were elected. A total of 120 bovine enamel slabs were prepared from the buccal surfaces of the bovine teeth. The slabs were divided into 5 subgroups (n=6) representing 5 time intervals (1, 7, 14, 21 and 35 days). Fluoride-ion selective electrode method was used to determine the enamel fluoride uptake was determined. Results: Glass ionomers and giomer had significantly higher fluoride uptake than compomer (p<0.05). Glass ionomers and giomer had similar fluoride uptake in all test intervals. Conclusion: Considering the enhanced physical properties and long-term fluoride release similar to glass ionomers, giomers are found to be promising. Keywords: Giomer, glass ionomer, fluoride uptake, fluoride-ion selective electrode