IADR Abstract Archives

Reducing Enamel Softening with Glass-ionomer Coating and Ca/P/F Toothpaste

Objectives: This study evaluated the effect of a glass-ionomer coating and a toothpaste with 0.21% sodium fluoride and tricalcium phosphate (Ca/P/F) in preventing enamel softening from a cola-drink acid challenge.

Methods: Thirty-two enamel specimens cut from eight bovine incisors were assigned into four groups (n=8). Each specimen in Groups A&B had a slot preparation (6x6x0.5 mm) which was coated with glass-ionomer (Vanish™ XT Extended Contact Varnish 3M™ ESPE™). Specimens in Groups B&C received two daily applications of 2 min Ca/P/F toothpaste (Clinpro™ Tooth Creme, 3M™ ESPE™). Group D (control) received neither the coating nor toothpaste. All specimens were subjected to twice daily acid challenge (Coke) for 8 minutes. The specimens were placed in saliva-like solution (1.5 mM Ca²⁺, 0.9 mM PO₄^3-, pH 7) except during toothpaste application and acid challenge. Enamel surface hardness (Vickers) was measured at baseline, 2-day, and 4-day. For Groups A&B, the hardness was measured at 0.2 and 1.0 mm from the coating margin. Percentage hardness decrease (%DVHN) was calculated by normalizing with the baseline value of each specimen.

Results: %DVHN are shown in the Table. Percentage hardness decrease in Group D was significantly higher than in Groups A, B, and C as shown by superscript letters (ANOVA followed by Student-Newman-Keuls test; p<0.05).

Mean (SD) %DVHN	A (Vanish XT)		B (Vanish XT + Ca/P/F)		C (Ca/P/F)	D (control)
Mean (SD) %DVHN	0.2 mm	1.0 mm	0.2 mm	1.0 mm	C (Ca/P/F)	D (control)
2-day	8.1 (4.9) ^a	10.6 (3.8)^a	6.0 (3.2)^a	8.1 (2.4)^a	8.7 (1.5)^a	19.8 (3.5)^b
4-day	8.2 (6.1)^a	9.7 (3.2)^a	6.0 (2.4)^a	6.4 (3.9)^a	5.8 (2.4)^a	20.2 (5.5)^b

Conclusion: Both glass-ionomer coating and fluoridated toothpaste with tricalcium phosphate could reduce enamel softening from a cola-drink acid challenge.

Supported in part by a Non-tenured Faculty Grant, 3M Foundation.

Division: AADR/CADR Annual Meeting
Meeting: 2010 AADR/CADR Annual Meeting (Washington, D.C.)
Location: Washington, D.C.
Year: 2010
Final Presentation ID: 313
Abstract Category|Abstract Category(s): Cariology Research

Authors

Tantbirojn, Daranee ( University of Minnesota, Minneapolis, MN, USA )

Augustson, David G. ( University of Minnesota, Minneapolis, MN, USA )

Rusin, Richard P. ( 3M ESPE Dental Products, St. Paul, MN, USA )

Versluis, Antheunis ( University of Minnesota, Minneapolis, MN, USA )

SESSION INFORMATION

Poster Session
Caries Inhibition – Varnishes, Coatings, CCP/ACP – Lasers
03/04/2010