INBDE Practice Exam 2026 – Complete Study Guide

Onlays are a type of dental restoration made of cast gold. Type 1 gold is used for full cast crowns and is not typically used for onlays, which are generally used for smaller restorations. Type 3 and 4 gold are low-gold alloys that are not suitable for dental restorations. Therefore, the correct type of gold used for onlays would be Type 2, which is a high-gold alloy specifically designed for dental restorations.