DOI: 10.36347/sjds.2015.v02i08.005

Pages: 444-448

Background: Provisional crowns are widely used in prosthodontic treatment, but their longevity is influenced by material choice and occlusal forces. This study aimed to evaluate the impact of material type, occlusal forces and patient habits on the longevity of provisional crowns. Methods: This prospective study was conducted from July 2014 to June 2015 at Bangabandhu Sheikh Mujib Medical University (BSMMU) and beau-dent, Dhaka, Bangladesh. A total of 100 provisional crowns were evaluated for longevity, failure characteristics and associated risk factors, including material type, occlusal forces and bruxism. Results: Crowns made from bis-acryl composite had a significantly longer median longevity of 6.2 months compared to 4.5 months for PMMA (p < 0.05). Crowns subjected to lateral forces had a higher failure rate (25%) and shorter longevity (4.2 months) compared to those exposed to vertical forces (15% failure rate, 6 months longevity) (p < 0.05). Logistic regression analysis showed that bruxism (OR = 2.8, p < 0.01), PMMA material (OR = 1.9, p = 0.02) and posterior teeth placement (OR = 2.3, p < 0.05) were significant risk factors for premature failure. Conclusion: The study highlights the critical role of material selection and occlusal forces in the longevity of provisional crowns. Bruxism and posterior tooth placement further influence failure rates, suggesting the need for tailored treatment planning to optimize crown durability.