Microleakage of Silver-Modified Atraumatic Restorative Technique (SMART) Restorations Using Silver Diammine Fluoride and High-Viscosity Glass Ionomer.

Purpose: The purpose of this study was to investigate the microleakage of atraumatic glass ionomer restorations with and without silver diammine fluoride (SDF) application. Restorations with SDF are termed silver-modified atraumatic restorations (SMART). Methods: Sixty carious extracted permanent teeth were randomly allocated to two SMART groups and two control groups (n equals 15 per group) for a total of four groups. After selective caries removal, test specimens were treated with 38 percent SDF and polyacrylic acid conditioner was applied and rinsed; teeth were restored with Fuji IX GP® glass ionomer (n equals 15) or with SMART Advantage™ glass ionomer (SAGI; n equals 15). For control groups, specimens were restored with their respective GI material after selective caries removal, both without SDF. Restored teeth were placed in Dulbecco's Phosphate-Buffered Saline solution at 37 degrees Celsius for 24 hours. Teeth were thermocycled between five and 55 degrees Celsius for 1,000 cycles, stained with two percent basic fuchsin, sectioned, and visually inspected for microleakage utilizing stereomicroscopy on a four-point scale. Data were statistically analyzed using Kruskal-Wallis one-way analysis of variance on ranks using Dunn's method (P<0.05). Results: Microleakage between the two SMART restoration groups was insignificant. SAGI alone demonstrated significantly more microleakage than all other groups. There was no statistical significance between the Fuji IX GP® control group and the two SMART restoration groups. Conclusions: This in vitro study indicated that silver diammine fluoride placed before glass ionomer restoration does not increase microleakage. Polyacrylic acid may be used after SDF placement without increasing microleakage.

Effectiveness of and Dental Student Satisfaction with Three Teaching Methods for Behavior Guidance Techniques in Pediatric Dentistry.

The aim of this study was to compare the effect of different types of instructional styles-traditional lecture with and without video examples and contemporary format that simulated a flipped classroom-on dental students' learning of behavior guidance techniques (BGTs) in pediatric dentistry. The study also sought to determine if students had an improved comfort level with BGTs with these instructional methods, if videos improved learning and comfort with BGTs, and if there were differences in outcomes by gender. All 96 second-year dental students at one U.S. dental school were recruited to participate in the study in 2017. Students were randomly divided into three groups: contemporary instruction (CI), traditional instruction with video (TIV), and traditional instruction with no video (TI). CI students watched a 20-minute mini-lecture and were divided into discussion groups led by calibrated faculty members. TIV students received 50 minutes of traditional lecture with video examples. TI students received a traditional lecture with no video examples. All groups completed a questionnaire prior to and on completion of the course. The questionnaire assessed students' learning and perceptions of the learning experience. All students participated in the course and the assessments, for a 100% response rate. The students' post-course scores improved for all teaching methods (TI>CI>TIV) with no significant differences among them. CI students rated comfort with BGTs and usefulness of videos higher than the other groups, but the difference was not statistically significant. Students rated their satisfaction with and usefulness of the course high for all groups (>3 on a four-point scale). Learning style and comfort treating children were not statistically significant by gender. Overall, the students reported high satisfaction with all the teaching methods. Although the differences were not statistically significant, discussion groups were ranked highest in satisfaction and usefulness.

Parents' Preferences and Perceptions of Their Children's Consumption of Sugar and Non-nutritive Sugar Substitutes.

Purpose: The purpose of this study was to investigate opinions and preferences of parents from various sociodemographics regarding sugar and both natural and artificial non-nutritive sugar substitutes (NNS). Methods: Oral interview surveys were conducted in dental practice settings. Parents were asked about demographics, their consumption of and feelings about sugar and NNS for themselves and their children, and their concerns regarding NNS. Parents were asked about natural and artificial labels and were asked to select snacks/beverages they would purchase for their children. Results: Parents (N equals 100) preferred sugar-sweetened drinks for their children (76 percent), and 78 percent expressed concern about the potential health effects of NNS, especially cancer. Parents felt sugar was safer than NNS and were more positive about natural NNS than artificial ones. More highly educated parents (P = 0.02) were more likely to avoid NNS for their children, and parents of the lowest income level were likely to express ambivalence regarding naturally labeled NNS. Conclusions: Parents are concerned about giving their children NNS and cite cancer as the primary reason. Parents from higher sociodemographic backgrounds are more likely to limit their children's consumption of NNS and have negative feelings about them. Most parents, especially those of higher sociodemographics, are more accepting of natural NNS.

Intrapulpal Temperature Rise During Light Activation of Restorative Composites in a Primary Molar.

PURPOSE: To investigate intrapulpal temperature rise in a primary molar during light activation of a composite restoration to determine if clinically significant pulpal temperatures (greater than 5.5 degrees Celsius) were reached. METHODS: Restorative composites (EsthetX HD, Filtek Supreme Ultra, Filtek Bulk Fill) were placed into a primary molar with occlusal preparation (1.5 mm depth; remaining pulpal floor thickness one mm). The pulp was extirpated through a root access to place a thermocouple against the pulpal roof. Temperature changes were recorded during composite restoration light polymerization with three curing lights (one quartz-tungsten-halogen, two LEDs). Sample size was 10. Samples received additional irradiation to assure complete polymerization, followed by a third irradiation for calculating the exothermic heat contribution (subtracting third irradiation temperatures from first irradiation temperatures). Cured restorations were removed after each test, and the tooth was reused. Results were analyzed with Kruskal-Wallis (α =0.05). RESULTS: Type of curing light and composite material affected the intrapulpal temperature rise, which was up to five degrees Celsius for one combination of LED-composite. CONCLUSIONS: Clinicians should be aware of the potential for clinically significant intrapulpal temperature rises when light-activating composite restorations in a primary molar with a moderately deep cavity.