Fluctuating dental asymmetry and measurement error

Area of Science:

• Paleoanthropology
• Bioarchaeology
• Dental Morphology

Background:

• Assessing fluctuating dental asymmetry is crucial for understanding developmental stability in past populations.
• Small sample sizes common in archaeological research pose challenges for detecting subtle bilateral differences in tooth dimensions.

Purpose of the Study:

• To analyze differences in left and right molar tooth dimensions.
• To evaluate the impact of measurement error on the assessment of fluctuating dental asymmetry.
• To consider the statistical power of the F-Ratio in detecting small differences in archaeological samples.

Main Methods:

• Measurement and remeasurement of molar teeth from two Nubian cemeteries (Kulubnarti, Sudan).
• Statistical analysis using the F-Ratio to detect differences between antimeric (left and right) tooth dimensions.
• Analysis of measurement error to assess its influence on asymmetry interpretations.

Main Results:

• The F-Ratio's power to detect small, real differences is limited with small sample sizes typical of archaeological materials.
• Measurement error can significantly confound interpretations of fluctuating dental asymmetry, even in large samples.
• Bilateral molar tooth dimension differences are influenced by both biological variation and measurement inaccuracies.

Conclusions:

• Interpreting fluctuating dental asymmetry in archaeological human remains requires careful consideration of measurement error.
• Statistical methods like the F-Ratio may have limited power to detect subtle asymmetries in small archaeological samples.
• Future bioarchaeological studies should prioritize robust methodologies to mitigate measurement error's impact on dental asymmetry analyses.