Reliability of single and double probing attachment level measurements

Area of Science:

• Periodontology
• Clinical Research Methodology

Background:

• Reliability of probing attachment level measurements is crucial for assessing periodontal disease.
• Accurate diagnostic rules and outcome measures are needed for clinical treatment studies.

Purpose of the Study:

• To describe and compare the longitudinal reliability of single and double probing attachment level measurements.
• To estimate false positive and false negative rates for diagnostic accuracy.

Main Methods:

• Longitudinal study of 20 adults with advanced periodontitis over 11 months.
• Double measurement of attachment levels using acrylic onlays and an electronic pressure-sensitive probe.
• Statistical analysis including cross-sectional and longitudinal methods to estimate diagnostic error rates.

Main Results:

• Mean absolute difference between replicate measurements was low (0.095-0.107 mm) and decreased over time.
• Correlation coefficients for replicate measurements exceeded 0.98.
• False positive rates were significantly lower than false negative rates.

Conclusions:

• Double probing attachment level measurements demonstrate high longitudinal reliability.
• Specific measurement protocols can optimize statistical power by balancing examiner reliability and sample size.
• Methodology provides guidelines for designing robust clinical studies in periodontology.