|0600 Two Chairside Dentin Desensitizers: A Critical SEM Review|
E.A. MONACO1, T. BONSTEIN2, P.J. BUSH1, and A. MONARRES1, 1 University at Buffalo, State University of New York, USA, 2 State University of New York at Buffalo, USA|
Objective: The aim of this study is to assess and characterize the etched dentin surface following treatment with a dentin desensitizer to investigate product claims and propose suitable clinical applications. The two products selected for this study were HEMA based (GLUMA Desensitizer, Heraeus Kulzer ), and potassium oxalate based (Super Seal, Phoenix Dental) dentin desensitizers Method: Dentin slices from freshly extracted human third molars were etched with 37% phosphoric acid (Total Etch, VIVADENT). The two dentin desensitizers were applied in a single and double applicationon on the etched dentin. Following application of the desensitizers, test specimens were dried fractured and prepared for SEM analysis. Result: One application of either of the desensitizer on the etched dentin surface revealed partially closed tubules. The HEMA desensitizer produced a smooth surface with interruptions from the partially blocked tubule orifices. The potassium oxalate desensitizer produced a wavy surface with crystals precipitated at variable depths in the tubule orifices. The double application of the desensitizer produced distinctly different surfaces. The HEMA desensitizer produced a smooth confluent coat with all tubules almost completely blocked. The potassium oxalate desensitizer produced surface was similar in nature to the single application technique. The dentin surface was wavy replicating the morphology of the etched surface pattern with crystals clearly precipitated at various depths in the dentin tubules. Conclusion: single application of potassium oxalate desensitizer is clinically advisable since it produced the same results as double application. It is speculated that the potassium oxalate based desensitizer may not interfere with the bond strength with a dentin bonding agent because of the availability of dentin above the crystal precipitate layer to produce the hybrid layer. Single application of HEMA based desensitizer on etched dentin is not sufficient to occlude the tubules, thus double application is needed.
|Seq #82 - Adhesive Interface Microstructure|
3:45 PM-5:00 PM, Thursday, 13 March 2003 Henry B. Gonzalez Convention Center Exhibit Hall C