What is the recommended height of intact tooth structure between the top of initial cord and preparation margin?

The recommended height of intact tooth structure between the top of the initial cord and the preparation margin is 1mm. This height is significant for several reasons.

Firstly, maintaining this specific height helps ensure that there is adequate tooth structure remaining to support the restoration while minimizing the risk of damaging the pulp or compromising the integrity of the tooth. A 1mm margin provides enough clearance for proper placement of restorative materials and enhances the overall strength and longevity of the restoration, particularly in areas subject to occlusal forces.

Additionally, this height is considered optimal for effective flow and retention of dental materials, helping to create a seal that reduces the risk of microleakage and potential secondary caries. It also allows for sufficient visualization and accessibility during the restorative procedure.

Establishing this height aids in achieving an ideal cervical finish line which is critical for both aesthetic outcomes and functional performance of the prosthetic restoration. Thus, setting the intact tooth structure at 1mm aligns with best practices in dental preparation and restoration techniques.