Comparison of shear bond strength and micro-leakage of three commercially available seventh generation bonding agents in primary anterior teeth: an in vitro study.

PURPOSE: The study was conducted with the aim of comparing the shear bond strength (SBS) and microleakage of Tetric N-Bond, G-bond, and Xeno V (seventh generation dentin adhesives) in primary anterior teeth. MATERIALS AND METHODS: For the shear bond strength, 45 teeth were randomly divided in to three groups namely group A, B, C (n = 15). Samples were mounted horizontally on acrylic block exposing the facial surface and bonded with different adhesives according to manufacturer instructions. A split Teflon mold was used to build the composite resin cylinder and light cured. Shear bond strength was tested using a universal testing machine. The values were statistically analysed. For microleakage, another 45 teeth were similarly grouped. Two class V cavities were prepared on the labial surface and treated with different dentine bonding agents and restored with resin composite (Ivoclar vivadent) A2 shade. The restorations were subsequently thermally stressed for 200 cycles and were subjected to dye penetration test, followed by sectioning through the center of the restoration labiolingually. Each section was examined using stereomicroscope at × 40 magnification to asses dye penetration at the margins of the restoration. RESULTS: The SBS varied between 22.12-23.77 N/mm 2 (P-value = 0.231). The microleakage scores varied between 0.6-1.2 (P-value = 0.03; Post-hoc test A vs B (0.007)).There was a statistically higher degree of microleakage observed in group A when compared to group B. CONCLUSION: Among the three commercially available bonding agents, there were no statistically significant differences in SBS. G bond had higher microleakage when compared to the others.

Comparison of anxiety levels associated with noise in the dental clinic among children of age group 6-15 years.

Fear or anxiety due to noise produced in the dental clinic is rated third among the reasons to avoid dental visits. The aim of the present study was to determine anxiety levels associated with noise in a dental clinic. The study was done using a survey questionnaire containing 10 questions and was divided into two parts. The first part included demographic information such as name, age, gender, and school; the second half included questions regarding patient's feelings toward noise in the dental clinic and its possible link to dental anxiety. Two-hundred and fifty children and adolescents of age group 6-15 years participated in the study. Results of the study showed that 50% of females, 29% males avoided a visit to the dentist because of anxiety and fear, 38% subjects of age group 6-11 years reported that sound of the drill makes them uncomfortable, followed by having to wait in the reception area. Gender gap was also observed with more females feeling annoyed than males on the 1-10 annoyance level scale. More than 60% felt "annoyed" to "extremely annoyed" by noise in the dental clinic. 45% of subjects preferred watching television to cope with such noise. This study concludes that the noise produced in dental clinic is anxiety provoking and significantly contributes to avoidance of dental treatment and the best way opted by the majority of subjects to overcome this anxiety was audiovisual distraction method.