258 Mechanical and Physical Properties of Vital Pulp Therapy Materials

Thursday, March 22, 2012: 2 p.m. - 3:15 p.m.
Presentation Type: Poster Session
K. BENTLEY, S. JANYAVULA, D. CAKIR, P. BECK, L. RAMP, and J. BURGESS, University of Alabama at Birmingham, Birmingham, AL

Objectives: To measure the compressive strength of three pulp capping materials at 3 times and record the marginal seal of Biodentine and N'Durance resin-based composite at the tooth-restoration interface. Methods: Compressive Strength: Samples (n=10) of Biodentine, MTA, and Dycal/LD Caulk were prepared using Teflon cylinder molds (d=4/h=8mm), stored (37C/distilled water) and loaded until failure (1mm/min) using Instron (Model/5565) at 35minutes, 24hours, and 28days. Microleakage: Class I preparations were placed in fifteen extracted, intact, human molars and randomly divided into 3 groups (n=5). Cavities were restored with Biodentine or N'Durance, or Biodentine+N'Durance. Single Bond Plus adhesive/3M ESPE was used to bond N'Durance to tooth. Biodentine+N'Durance samples were prepared with Biodentine filling the occlusal preparation, stored (37C/distilled water/48hours) then the occlusal of Biodentine was removed and restored with N'Durance/Single Bond Plus and incubated (37C/distilled water/24 hours). N'Durance and Biodentine+N'Durance samples were finished with magnification. Microleakage was measured by applying nail varnished except for 2mm adjacent to the restoration and placing the specimens into 2% methylene blue solution for 3hrs. Samples were sectioned axially through the restorations and wet ground (600/1000/2000-grit SiC paper). Dye penetration was classified into 0 no leakage, 1 leakage into enamel and 2 leakage into dentin. Twenty readings were obtained for each group. Data were analyzed using ANOVA and Tukey-Kramer post-hoc tests or (leakage) Kruskal Wallace test (p=0.05).

Results: (MeanSD)

Material/Manufacturer

Compressive Strength-MPa

35-minutes

24-hours

28-days

Biodentine/Septodont

10.62

57.112

72.68

Dycal/Dentsply

9.21

171

14.34

MTA/Dentsply

0.0070.015

8.52

37.112

 

Material

Score/# of readings

0

1

2

Biodentine

20

0

0

N'Durance

7

7

6

Biodentine+N'Durance

11

8

1

Conclusion: Biodentine was significantly stronger than MTA at all time periods (p<.05) and should support occlusal forces for a short time as well as provide an effective seal. This study was supported by NIDCR 5T32DE017607-DART

 

This abstract is based on research that was funded entirely or partially by an outside source: NIDCR-5T32DE017607DART

Keywords: Biomaterials and Microleakage
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