Scientific methodology in temporomandibular disorders. Part I: Epidemiology

Area of Science:

• Epidemiology
• Dental Research
• Public Health

Background:

• Published epidemiological studies on temporomandibular disorders (TMD) exhibit considerable variation in occurrence rates.
• The heterogeneity of TMD, encompassing diverse etiologies and symptomologies, complicates group-based epidemiological analysis.
• Existing epidemiological approaches may not adequately address the complexity of TMD as stress-related disorders.

Purpose of the Study:

• To critically evaluate the epidemiological methodology applied to the study of temporomandibular disorders (TMD).
• To identify key methodological limitations affecting the reliability and validity of TMD epidemiological research.
• To explore the suitability of epidemiological methods for investigating TMD, considering their multifactorial nature.

Main Methods:

• Logical examination of epidemiological study designs for TMD.
• Analysis of control group selection in TMD research.
• Assessment of criteria subjectivity in TMD epidemiological studies.
• Evaluation of TMD heterogeneity's impact on epidemiological approaches.

Main Results:

• Significant variability in published TMD occurrence data suggests underlying methodological weaknesses.
• The use of proper controls is crucial but often inadequately addressed in TMD epidemiology.
• Subjectivity in diagnostic criteria introduces bias and inconsistency in TMD epidemiological findings.
• Treating TMD as a monolithic entity in epidemiological studies can be misleading due to their diverse nature.

Conclusions:

• Current epidemiological methodologies require refinement to accurately assess TMD occurrence and characteristics.
• Addressing methodological limitations, including control selection and criterion subjectivity, is essential for advancing TMD research.
• The heterogeneity of TMD necessitates tailored epidemiological approaches rather than a one-size-fits-all strategy.