From classroom to clinic: Evaluating the educational utility of two Thiel embalming methods

Over three decades since its introduction, the Thiel embalming method remains a widely used and praised technique in anatomical education and clinical training. This study compared for the first time the Thiel original protocol (TO) and a Modified version (TM) across user groups-undergraduate medical students, student demonstrators in anatomy, postgraduate trainees, and expert anatomists-to evaluate tissue quality and educational suitability. A total of 520 participants assessed both methods based on tissue preservation, color, pliability, and achievement of learning objectives. Undergraduate medical students and demonstrators rated TO significantly higher than TM in all domains (p < 0.01), highlighting its lifelike appearance, clear anatomical definition, and superior dissection properties. Anatomists supported these findings, citing better tissue realism and structural integrity in TO specimens. Postgraduate users, mainly orthopedic surgeons, rated both methods similarly for musculoskeletal and nervous tissues, but preferred TO for the clarity of visceral organs (p < 0.01). While TM offered improvements for musculoskeletal training, users reported challenges including overly soft viscera, liquefied fat, and reduced structural clarity, making it less suitable for beginners. Both TO and TM were rated superior to formaldehyde- or ethanol-based techniques in terms of educational utility and realism. Qualitative feedback confirmed TO as better suited for undergraduate anatomy education, particularly for dissection. TM, though valuable in specialized postgraduate training, was seen as less appropriate for novice learners. The findings highlight the need to align embalming protocols with educational goals and experience levels, with TO remaining the preferred method for foundational anatomical training.