Where should the cervical finish line of a full veneer crown preparation be placed?

The cervical finish line of a full veneer crown preparation should ideally be placed just supragingival whenever possible. This placement is preferred for several reasons, all of which center around healthy periodontal conditions and ease of future dental procedures.

First, placing the finish line supragingival minimizes the risk of irritation to the surrounding gingival tissues. When the finish line is positioned above the gum line, it promotes better oral hygiene as patients can more easily clean the area without risking damage or inflammation to the gums.

Additionally, a supragingival finish line typically enhances the esthetic outcome, especially in anterior teeth where visibility is important. It also facilitates a more straightforward application of materials since dental cements and bonding agents can be more effectively applied when not submerged beneath the gum tissue.

Moreover, a supragingival finish line helps in maintaining periodontal health by minimizing the potential for plaque accumulation and subgingival bacteria that can lead to periodontal disease.

The other options may suggest varying depths of the crown margin, but these alternatives can introduce complications such as increased risk of periodontal problems or difficulty in cleaning accessible surfaces. Therefore, a supragingival approach aligns best with principles of restorative dentistry focusing on both function and aesthetics while promoting overall oral health.