Directional PICO framing and unsupported conclusions in prosthodontic systematic reviews: A methodological analysis

Area of Science:

• Dental Research
• Evidence-Based Dentistry
• Prosthodontics

Background:

• Systematic reviews are crucial for evidence-based prosthodontics.
• Methodological decisions in reviews can influence their conclusions.
• Understanding these influences is vital for accurate interpretation of findings.

Purpose of the Study:

• To analyze how question framing, surrogate outcomes, and interpretation methods affect conclusions in prosthodontic systematic reviews.
• To examine reviews with limited, heterogeneous, or indirect evidence.
• To identify patterns influencing review outcomes.

Main Methods:

• Analysis of eight prosthodontic systematic reviews using PICO (Patient/Problem, Intervention, Comparison, Outcome) or focused clinical questions.
• Assessment of question framing neutrality, handling of surrogate versus clinical outcomes, and heterogeneity management.
• Comparison against a Cochrane review for interpretive proportionality and neutrality.

Main Results:

• All reviewed prosthodontic systematic reviews showed interpretation influenced by framing, evidence type, or heterogeneity.
• Directional question framing often led to directional conclusions.
• Reliance on surrogate or in vitro outcomes frequently resulted in extrapolated clinical recommendations.

Conclusions:

• Directional framing, surrogate outcomes, and evidence limitations appear to shape conclusions in prosthodontic systematic reviews.
• Neutral framing, clear outcome differentiation, and transparent heterogeneity management can improve future evidence syntheses.
• Strengthening alignment between conclusions and evidence certainty is recommended.