Résumé
The ain of this research was to know the real role of mix propolis and calcium hydroxide dressings in treating the periapical lesions of non-vital closed apexes teeth. After know a site of its chemosynthesis. To approach this goal a clinical study has been performed on a 60 cases divided into 3 original groups: Group [1]: 20 closed apexes teeth /prepared in rotary technique [K3] and put Calcium Hydroxide dressing, then sealed by Gutta-Percha. Group [2]: 20 Closed apexes teeth /prepared in rotary system [K3] and put propolis dressing, then sealed by Gutta-Percha. Group [3]: 20 Closed apexes teeth /prepared in rotary system [K3] and put a mix of propolis and Calcium Hydroxide dressing, then sealed by Gutta-Percha After that, we observant redial sign during 6 months later, we observant radial sign and compare the size of periapical lesions. Statistical study revealed that group 2 [60%] was better than group 1 [50%] of complete success but in group 3 [80%] mixing propolis and calcium hydroxide dressings proved its activity as a dressing in non-vital root canals and its capability for inducing healing of periapical lesions