The reliability and validity of the restoration difficulty evaluation system tool for assessing the restoration of...

Restoration of endodontically treated teeth (ETT) is crucial for their long-term functionality, yet current practices lack structured approaches, leading to variable outcomes. The restorative difficulty evaluation system (RDES) offers a systematic method to assess restoration complexity tailored to each patient. This pilot study aims to evaluate RDES's reliability and validity in guiding clinicians' decisions on ETT restoration.

Ten participants were recruited, and two endodontists independently assessed clinical parameters using RDES. Interrater reliability was assessed to determine agreement between examiners. Test-retest reliability was evaluated over two time points (baseline and 2 weeks). Face and content validity were assessed by a panel of 10 experts.

Intrarater reliability was robust (Evaluator 1: r = 0.667 and Evaluator 2: r = 0.655). Interrater reliability was substantial (κ =0.783). Face validity affirmed RDES parameters' relevance with scores exceeding the impact score threshold. Content validity showed high item-rated content validity index (I-CVI) scores for both relevance (I-CVI [R]) and clarity (I-CVI [C]), resulting in high scale-level CVI scores, affirming all RDES items' appropriateness. The Gunning Fog Index (14.79) suggests tool's suitability for college junior or undergraduate-level readers.

The study demonstrates RDES's reliability and validity in assessing restoration complexity in ETT. Its systematic approach can inform treatment decisions, potentially enhancing patient outcomes.