The effect of post-surgical flap placement on probing depth and attachment level: a 2-year longitudinal study

Area of Science:

• Periodontology
• Surgical Dentistry

Background:

• Postsurgical flap placement is a key factor in periodontal surgery outcomes.
• Modified Widman flap and apically positioned flap surgeries are common but their superiority remains unproven.

Purpose of the Study:

• To determine the optimal postsurgical flap placement for minimizing probing depth and maximizing clinical attachment level.
• To evaluate the long-term effects of flap positioning on periodontal health.

Main Methods:

• A longitudinal study involving 12 subjects (186 teeth) with adult periodontitis.
• Baseline probing depth and clinical attachment level were recorded, followed by postsurgical flap placement measurement (sounding depth).
• Measurements were reassessed at 2 years post-surgery after a 3-month maintenance program.

Main Results:

• A positive correlation (R = 0.43) was found between immediate postsurgical sounding depth and 2-year probing depth.
• Sites with sounding depth ≤3 mm showed significantly lower mean probing depth (2.52 mm) compared to sites with sounding depth ≥4 mm (3.58 mm).
• Changes in clinical attachment level showed only a weak inverse correlation with sounding depth and no statistically significant differences between groups.

Conclusions:

• Flap placement at or slightly coronal to the bone crest (≤3 mm sounding depth) is recommended for achieving minimal probing depth after periodontal flap surgery.
• This positioning appears more critical for probing depth reduction than for clinical attachment level changes.