ABSTRACT
AIM: To evaluate influence of three different filler particles on an experimental Bisphenol A ethoxylated dimethacrylate (Bis-EMA) based root filling material. MATERIALS AND METHODS: Resin-based endodontic sealers were produced using Bis-EMA, camphorquinone, ethyl 4-dimethylaminobenzoate (EDAB), N, N-dihydroxyethyl-p-toluidine (DHEPT), butylated hydroxytoluene (BHT), and benzoyl peroxide. The experimental groups were formulated adding 10, 20, 30, 40, and 50% of calcium tungstate (CaWO4), ytterbium trifluoride(YbF3), and tantalum oxide(Ta2O5). Flow, thickness, and radiopacity tests were conducted in accordance with ISO 6876. Sorption and solubility (SL) tests were conducted in accordance with ISO 4049, pH was measured with a pH meter, and degree of conversion (DC) was evaluated with Fourier transform infrared spectroscopy (FTIR). For radiopacity, two-way analysis of variance (ANOVA) and Tukey's multiple comparison test was performed. For DC analysis, one-way ANOVA and Tukey's multiple comparison test was performed. All statistical analyses were performed with a significance level of 5%. RESULTS: All groups showed lower flow with increased filler concentration. All groups showed film thickness values lower than 50µm, as ISO recommends, except CaWO450% group (76.7µm). pH values varied from 5.95 (± 0.07) in YbF340% group to 6.90 (± 0.07) in Ta2O540% group. In the radiopacity test, YbF330%, Ta2O540%, and Ta2O550% groups showed no statistical significant difference to 3mmAl. Ta2O5 and YbF3 groups in 10, 20, and 30% concentrations presented sorption and SL values as ISOrecommendation. Addition ofTa2O5 and CaWO4 decreased DC after 14 days. YbF3 addition showed no difference in DC from control group. CONCLUSION: YbF3 filler addition promoted higher properties compared to CaWO4 and Ta2O5 on Bis-EMA based root canal sealer.
ABSTRACT
PURPOSE: To evaluate elementary schoolteachers' knowledge and decision making regarding dental trauma in Porto Alegre, Brazil. MATERIALS AND METHODS: A questionnaire-based survey was conducted among elementary schoolteachers (n=442). Questions encompassed sociodemographic characteristics and decision making regarding dental trauma. Data on the appropriate answer regarding what to do with a traumatised or avulsed tooth were analysed with multiple logistic regressions, adjusting for age, gender, work experience and previous training. RESULTS: The study population consisted largely of women (90%), was 40 to 49 years old (44.3%) and had more than 15 years of work experience (56.6%). Women (OR=2.68/p=0.041), teachers under 30 years old (OR=4.95/p=0.041), those with more than 15 years of work experience (OR=8.95/p<0.001) or those who had already received previous dental trauma instructions (OR=1.95/ p=0.119) were more likely to choose the appropriate answer for an avulsion situation. Teachers under 30 years old (OR=2.88/ p=0.279), those with more than 15 years of work experience (OR=4.55/p=0.001) or those who had received previous training (OR=3.39/p=0.009) presented higher probabilites of choosing the appropriate answer for a crown fracture event. CONCLUSION: Greater work experience or previous instructions on how to approach dental trauma in the school environment were found to be major factors in schoolteachers' decision making regarding dental trauma.
Subject(s)
Decision Making , Faculty , Health Knowledge, Attitudes, Practice , Tooth Injuries/therapy , Adolescent , Adult , Age Factors , Attitude to Health , Brazil , Child , Cross-Sectional Studies , Emergency Treatment , Female , Health Education, Dental , Humans , Male , Middle Aged , Sex Factors , Tooth Avulsion/therapy , Tooth Crown/injuries , Tooth Fractures/therapyABSTRACT
OBJECTIVE: The objective of this study was to evaluate the influence of chlorhexidine application after dentin phosphoric acid etching at immediate and long-term bond strength of a fiber post cemented to root dentin. STUDY DESIGN: Seventy-two single-rooted, human upper teeth were selected. After phosphoric acid etching, each group received a different dentin treatment: no pretreatment or chlorhexidine 0.2% or 2.0%. Three-step etch-and-rinse adhesive and dual-cured resin cement was used to cementation procedure. Half of the teeth were submitted to push-out bond strength test after 24 hours and the other half after 6 months. Data were analyzed by 2-way ANOVA and Tukey. RESULTS: Chlorhexidine application had no influence on bond strength when teeth were stored at the same aging time (P > .05). The storage time significantly decreased the bond strength values of 24 hours to 6 months in all groups (P < .05). CONCLUSION: After 6 months, chlorhexidine application did not effectively arrest bond strength degradation of fiber posts cemented in human roots.