Iowa Section of AADR - The University of Iowa College of Dentistry

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iomechanics. Supported by: University of Iowa, College of Dentistry, Iowa Dental Research Grant 24. Effect of Benzalkonium Chloride Adhesive System on Resin-Dentin Bond Durability A. Murray 5 , M.A. Vargas 5 , S. Geraldeli 9 , F. Qian 8 , L. Chen 7 5 University of Iowa College of Dentistry, Iowa City, IA; 7 Research and Development, Bisco, Schaumburg, IL; 8 Department of Preventive and Community Dentistry, University of Iowa, Iowa City, IA,; 9 Restorative Dental Sciences, University of Florida, Gainesville, FL Objectives: The resin-dentin bond is degraded by endogenous dentinal proteinases activated by acidic compounds contained in dental adhesive systems. Several compounds have been suggested to neutralize these proteinases, including benzalkonium chloride (BAC). The objective is to evaluate the effect of incorporating various concentrations of BAC on the short and intermediate bond strength of a one-step self-etch adhesive. Methods: Forty-eight human molars stored in 0.5% chloramine solution were used within 3mo of extraction and randomly assigned to 4 groups (n = 12). Flat dentin surfaces were prepared with a water-cooled, low-speed diamond saw (Isomet1000, Buehler). A standardized smear layer was prepared using 600-grit wet sandpaper. Three experimental one-step self-etching adhesives (Bisco Inc.) were formulated with 0.1%, 0.2% and 0.5% BAC following manufacturer’s guidelines. A three increment build-up of approximately 5mm was made using resin composite Estelite Sigma Quick (Tokuyama). Each increment was light cured (690-730 mW/cm 2 ) for 20sec with sectioned to obtain six rectangular sticks from the central part of the bonded surface with a cross section area of approximately 0.8mm. At random, two sticks from each group were subjected to tension at a crosshead speed of 1.0mm/min using a Zwick testing machine at 1wk and two sticks at 10wks. Results: A two-way repeated measures ANOVA was used to evaluate differences among the groups by adhesive and and BAC concentrations did not affect microtensile bond strength. Conclusions: The incorporation of BAC did not affect the bond strength of the experimental one-step self-etch 22 adhesive. Supported by: NIDCR Training Grant T32 DE014678-09 25. Cephalometric Measurements in Adolescents with Class I Normal Occlusion J.J. Grabouski 1 , R.N. Staley 1 , C.M. Kummet 1 1 University of Iowa Objectives: by Angle Class. The objectives of this study were to (1) describe CN for a random sample of adolescents with Class I normal occlusion (CIN), (2) develop adolescent CN, and (3) test the hypothesis that CN of genders are similar. Methods: Radiographs of adolescents (19 male, 19 female, mean age=12.0 years) were taken from the Iowa Facial Growth Study [IRB permission]. Fourteen cephalometric measurements (11 angular, 3 linear) were recorded with a cephalometric protractor and digital calipers. Intra-rater reliability correlations (r = .9774-.9981, p< 0.0001) showed excellent agreement between duplicate measurements. Gender differences were analyzed using Student’s t-test. Visual comparisons of genders were generated using histograms of measurement variables. Results: between genders (p > 0.05). Non-statistical comparisons of means in this study (G) with previous means: Downs (D), Riedel(R), Michigan (M), Taylor & Hitchcock (TH), Harris (H), Saksena (S) yielded mostly similarity. Dissimilarities included FH/N-Pog 4.8° (1sd) higher in (D); MP/FH 7.2° (1sd) lower in (D); Inter-incisal angle 7.4° (1sd) higher in (D); upper incisor/A-Pog 3 mm (1sd) lower in (D); and male N-Me distance 6mm (1sd) higher in (M). Conclusions: The null hypothesis predicting no differences between adolescent males and females was accepted for all cephalometric variables. The differences between the present study means and those of previous studies may be explained by (1) sample differences, selection of subjects, and perhaps growth maturation in (D). Most previous CN observed appear satisfactory for adolescents. Supported by: University of Iowa, College of Dentistry, Dows Research Award 24
adhesive. Supported by: NIDCR Training Grant T32 DE014678-09 25. Cephalometric Measurements in Adolescents with Class I Normal Occlusion J.J. Grabouski 1 , R.N. Staley 1 , C.M. Kummet 1 1 University of Iowa Objectives: by Angle Class. The objectives of this study were to (1) describe CN for a random sample of adolescents with Class I normal occlusion (CIN), (2) develop adolescent CN, and (3) test the hypothesis that CN of genders are similar. Methods: Radiographs of adolescents (19 male, 19 female, mean age=12.0 years) were taken from the Iowa Facial Growth Study [IRB permission]. Fourteen cephalometric measurements (11 angular, 3 linear) were recorded with a cephalometric protractor and digital calipers. Intra-rater reliability correlations (r = .9774-.9981, p< 0.0001) showed excellent agreement between duplicate measurements. Gender differences were analyzed using Student’s t-test. Visual comparisons of genders were generated using histograms of measurement variables. Results: between genders (p > 0.05). Non-statistical comparisons of means in this study (G) with previous means: Downs (D), Riedel(R), Michigan (M), Taylor & Hitchcock (TH), Harris (H), Saksena (S) yielded mostly similarity. Dissimilarities included FH/N-Pog 4.8° (1sd) higher in (D); MP/FH 7.2° (1sd) lower in (D); Inter-incisal angle 7.4° (1sd) higher in (D); upper incisor/A-Pog 3 mm (1sd) lower in (D); and male N-Me distance 6mm (1sd) higher in (M). Conclusions: The null hypothesis predicting no differences between adolescent males and females was accepted for all cephalometric variables. The differences between the present study means and those of previous studies may be explained by (1) sample differences, selection of subjects, and perhaps growth maturation in (D). Most previous CN observed appear satisfactory for adolescents. Supported by: University of Iowa, College of Dentistry, Dows Research Award 23 25
Page 1 and 2: 1 Iowa Section of the American Asso
Page 3 and 4: Table of Contents Letter from Dean
Page 5 and 6: Dental Research participants and Io
Page 7 and 8: Program Iowa Section of the America
Page 9 and 10: Pre-Doctoral, Graduate, and Post-Do
Page 11 and 12: Abstracts 1. Incidence of Signs and
Page 13 and 14: phenotypes are currently being eval
Page 15 and 16: 5. Effectiveness of Group Home Care
Page 17 and 18: 8. Three-Dimensional Soft Tissue As
Page 19 and 20: 12. Streptococcus mutans Glucan-Bin
Page 21 and 22: 16. Assessment of Convenience of Gl
Page 23 and 24: 20. Growth Relationships between th
Page 25: 23. The Effect of Maxillary Restric
Page 29 and 30: 28. Use of IV Sedation in Periodont
Page 31 and 32: 32. Caregivers’ Perceived Comfort
Page 33 and 34: 36. Effects of GR siRNA on Prolifer
Page 35 and 36: Iowa Section of AADR - Presidents 1
Page 37: We extend grateful acknowledgment t

Iowa Section of AADR - The University of Iowa College of Dentistry

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