Microleakage of multi-step and simplified-step bonding systems

Area of Science:

• Dentistry
• Dental Materials Science
• Restorative Dentistry

Background:

• Dental restorations require effective sealing to prevent microleakage.
• Dentin bonding systems (DBS) are crucial for achieving a durable bond between tooth structure and restorative materials.
• Multi-step and simplified-step DBS offer different application protocols, potentially impacting clinical performance.

Purpose of the Study:

• To compare the microleakage of three pairs of multi-step versus simplified-step dentin bonding systems (DBS) in Class V resin composite restorations.
• Specifically evaluate OptiBond vs. OptiBond FL, All-Bond 2 vs. One-Step, and Tenure vs. Tenure Quik.
• Assess microleakage at both enamel and cementum margins.

Main Methods:

• Class V cavities were prepared in 30 human molars with enamel and cementum margins.
• Teeth were randomly assigned to three groups, each using a specific pair of DBS.
• Restorations were subjected to water storage, thermocycling, and immersion in a dye solution to evaluate microleakage at enamel and cementum interfaces.

Main Results:

• OptiBond FL and One-Step exhibited significantly less microleakage at cementum margins compared to their multi-step counterparts.
• Tenure Quik showed reduced microleakage at enamel margins compared to Tenure.
• All DBS demonstrated less microleakage at enamel margins than cementum margins, with OptiBond FL and One-Step showing no significant dye penetration at cementum margins.

Conclusions:

• Simplified-step dentin bonding systems can achieve comparable or superior performance to their multi-step versions regarding microleakage.
• The choice of DBS may influence the sealing effectiveness at different tooth substrate margins (enamel vs. cementum).
• Further clinical studies are warranted to confirm the long-term efficacy of simplified-step DBS in diverse clinical scenarios.