Evaluation the Resistance form to Oblique Forces of Teeth Prepared to Receive Full Crowns by a Novel Mathematical Method

Background and aim: Full crown preparation must have resistance form geometry. The aim of this study was to investigate whether full crown preparation of undergraduate students work have resistance to oblique forces. Methods: The resistance of 41 first or second lower molars preparation of undergraduate students work to receive full crowns were examined by measuring three dimensions. These dimensions gave an indication whether a resistance form exists or not. Results: The preparations had no resistance towards the buccal direction in 71%, nor towards the lingual direction in 90% of the cases. Conclusion: Students should pay more attention to the resistance form geometry when preparing teeth to receive full crowns