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This study aimed to evaluate the effect of the addition of the activated charcoal to different formulations of calcium hydroxide on the fracture resistance of endodontically treated teeth. Ninety one freshly human extracted single rooted teeth were selected. The samples were cleaned and shaped and classified according to the type of the dressing into five groups; Group 1; (21 samples) dressed with calcium hydroxide paste with Iodoform (Metapex) (META, Chungcheongbuk-do, Korea), Group 2; (21 samples) dressed with conventional calcium hydroxide with saline (GAMA dental lab, Cairo, Egypt). Group 3; (21 samples) dressed with calcium hydroxide paste with Iodoform mixed with activated charcoal (Eucarbon Sedico, Cairo, Egypt) and Group 4; (21 samples) dressed with conventional calcium hydroxide and activated charcoal with saline and Group 5; Control group (undressed). The samples were further classified according to the observation time into: Subgroup A; (7 samples) after two weeks. Subgroup B; (7 samples) after one month and Subgroup C; (7 samples) after two months. Samples were loaded vertically after the observation periods using Universal Testing Machine until fracture. The results showed that the fracture resistance of the samples dressed with either Metapex or conventional calcium hydroxide showed lower resistance to fracture than those dressed with either two formulations with activated charcoal. It was concluded that the addition of activated charcoal to the calcium hydroxide compounds can decrease their weakening effect on the endodontically treated teeth. (1630) Medhat Taha Elfaramawy E.D.J. Vol. 67, No. 2 of activated charcoal to different formulations of calcium hydroxide on their weakening effect of root canal dentine. MATERIALS AND METHODS Samples Preparation: Ninty one freshly human extracted single rooted teeth inspected under surgical microscope (Seiler, USA) to exclude any cracks or fracture lines. Teeth were decoronated at cement-enamel junction using diamond bur in high speed with air/water coolant. Teeth were stored in saline till used. Root canal instrumentation: Biomechanical preparation of samples was done in step back manner reaching file #50 as a master apival file and last file for flaring was #70. Irrigation of the samples was carried out using sodium hypochlorite 2.5%. and patency of the samples was ensured using file #10. After dressing of the samples according to its classification the caronal portion was sealed using glass ionomer cement. The samples of the control group were tested without biomechanical preparation. Samples Classification: Samples were classified according to the type of the dressing into five groups; Group 1; (21 samples) dressed with calcium hydroxide paste with Iodoform (Metapex) (META, Chungcheongbuk-do, Korea), Group 2; (21 samples) dressed with conventional calcium hydroxide with saline (GAMA dental lab, Cairo, Egypt). Group 3; (21 samples) dressed with calcium hydroxide paste with Iodoform mixed with activated charcoal (Eucarbon Sedico, Cairo, Egypt) and Group 4; (21 samples) dressed with conventional calcium hydroxide and activated charcoal with saline and Group 5; Control group (undressed). The samples were further classified according to the observation time into: Subgroup A; (7 samples) after two weeks. Subgroup B; (7 samples) after one month and Subgroup C; (7 samples) after two months. Mounting of samples A plastic syringes (10 cm3) were used to form the sample block which consisted of a tooth imbedded perpendicularly in self-cure acrylic resin. Method of evaluation The samples were mounted on the lower fixed compartment of a Universal Testing Machine (Model LRX-Plus, Lloyd Instruments, Fareham, UK) with a loadcell of 5 kN –and secured by tightening screws. Samples were vertically loaded (1mm/min) until fracture occurred. Computer software (Nexygen-MT-4.6; Lloyd Instruments) was used to record the data. Statistical analysis: Data were analyzed using IBM SPSS V23 (IBM, USA) statistical analysis software. ANOVA and Kruskal-Wallis tests were used to compare data in each group. The level of significance was set at 0.05.

egyptian dental journal /egyptian dental journal

The Effect Of The Addition Of Activated Charcoal To Different Formulations Of Calcium Hydroxide On Their Effect On The Fracture Resistance Of Endodontically Treated Teeth.