A quantitative study of cementum removal with hand curettes

Area of Science:

• Periodontology
• Biomaterials Science

Background:

• Root planing is a critical periodontal procedure.
• Understanding cementum removal is key to effective treatment and minimizing root surface damage.

Purpose of the Study:

• To quantitatively measure root surface removal depth during in vitro root planing.
• To analyze the relationship between applied force, stroke number, and cementum removal.

Main Methods:

• Extracted periodontally healthy teeth from different age groups were used.
• Standardized curettes and a tension load cell measured force and defect depth.
• Histologic analysis quantified cementum removal and defect depth.

Main Results:

• Complete cementum removal was observed in most teeth with 20-70 strokes.
• A positive correlation exists between stroke number, applied force, and defect depth (P < 0.05).
• An inverse relationship was found between force per stroke and defect depth; increased force per stroke decreased defect depth.

Conclusions:

• Root planing effectiveness, measured by cementum removal depth, is influenced by stroke number and applied force.
• Optimizing force per stroke is crucial to balance effective root planing with minimizing root surface damage.