What is the purpose of creating a glide path before shaping with NiTi instruments?

• A. To assess coronal morphology
• B. To reduce instrument separation risk and guide subsequent shaping
• C. To determine periapical health
• D. To select irrigation protocol

Answer: (B)

Creating a glide path sets up a smooth, direct route from the canal orifice to the apex that all subsequent instruments follow. This minimizes abrupt changes in canal geometry and reduces the stress on shaping files, especially the NiTi ones, which are flexible but still prone to separation when they encounter resistance, ledges, or transportation. With a glide path in place, subsequent shaping becomes more predictable, safer, and less likely to bind or fracture in curved or irregular canals. It also helps preserve the original canal anatomy and improves irrigation penetration.

The other options don’t address this protective, guiding role: it isn’t about assessing coronal morphology, determining periapical health, or choosing an irrigation protocol.