Are retentive features required with minimally invasive preps?

• A. No
• B. Yes
• C. Depends on tooth
• D. Not sure

Answer: (A)

Relying on bonding rather than mechanical retention is the hallmark of minimally invasive preps. In this approach, the restoration is held in place primarily through adhesive bonding to prepared enamel and dentin, often with margins kept in sound tooth structure. When the margins stay mainly in enamel and an effective bonding system is used, the bond itself provides enough retention, so creating extra retentive features isn’t required. This preserves tooth structure and aligns with the goal of MID. There can be exceptions based on tooth condition or material choice, but as a general rule, retentive features are not needed in minimally invasive preparations.