Dental OSCE (Objective Structured Clinical Examination) Practice Exam

How much gutta percha should be left at the apex?

1. 2-3 mm

2. 4-5 mm

3. 6-7 mm

4. 8-9 mm

The correct answer is: 4-5 mm

Leaving 4-5 mm of gutta percha at the apex is considered optimal in endodontic procedures. This amount allows for an effective seal at the root canal terminus while also reducing the risk of overfilling, which can lead to complications such as periapical inflammation or the extrusion of materials beyond the apex. The goal is to create a fill that adequately fills the canal space and provides a barrier to bacteria without extending too far and interfering with surrounding tissues. Maintaining this specific distance also helps ensure that there is enough of the natural dentin and surrounding structure for adequate support and prevents potential resorption or reinfection. Thus, the recommendation of 4-5 mm is based on a balance between effective endodontic sealing and preserving the health of the periapical region.