Resistance of two dentin-bonding agents and a dentin densensitizer to acid erosion in vitro

Objectives: To determine the resistance of two dentin-bonding agents (DBAs) and a dentin desensitizer to simulated dental erosion. Methods: Twenty teeth in each of three groups of selected premolars, with exposed cervical dentin, were treated with one of three dentin surface treatment systems: Gluma Desensitizer (Heraeus Kulzer (UK) Ltd), One Coat Bond (Whaledent (UK) Ltd), and Optibond FL (Kerr (UK) Ltd) and exposed to water (control) and an erosive challenge (Coca Cola®) for 14 days. Sequential tracings of the specimens were taken, superimposed and the mean reduction in densensitizer or DBA thickness and or tooth loss determined. Results: A mean loss of 77 μm (s.d. 14.6 μm) of tooth tissue over the untreated sites following 14 days exposure to Coca Cola® was observed. The application of DBAs, as opposed to Gluma Desensistizer alone, over exposed dentin surfaces afforded substantial protection against erosion by Coca Cola® over the period of study. The mean change in vertical profile of teeth treated with a DBA was 20 μm (s.d. 14.7 μm), almost four times less than that seen over untreated sites. Significance: With the exception of Gluma Desensitizer, which was lost completely, One Coat Bond and Optibond FL demonstrated levels of acid dissolution resistance, which would be of potential value clinically.