Abstract:
Introduction: Post and core is an restorative options on non vital teeth after endodontic treatment. Endodontically treated teeth have higher fracture risk than vital teeth. Post and core materials have mechanical properties like modulus elasticity that effect impact strength of post and core materials. Impact strength defined as the energy required to break material with impact force. This study was aimed to determine the differences between impact strength of prefabricated metal post with glass ionomer modification (Miracle Mix) core build up and composite resin (Multicore) core build up. Methods: Eight obturated mandibular premolars 2 months post extractions were divided into two groups: Group I was given a prefabricated metal post with glass ionomer modification (Miracle Mix) core build up (n = 4); group II was given a prefabricated metal post with composite resin (Multicore) core build up (n = 4). All groups were planted in a rectangular iron block. Furthermore, the impact test was performed using a mini-impact tester (KRY type) until all samples were broken. Result: The average impact strength of prefabricated metal post with glass ionomer modification (Miracle Mix) core build up was 2539.1 ± 1017.089891 J/mm2, while prefabricated metal post with composite resin (Multicore) core build up was 4141.975 ± 425.95233 J/mm2. Independent sample t-test showed that there were differences in all groups. Conclusion: The impact strength of prefabricated metal post with composite resin (Multicore) core build up was higher than the impact strength of the prefabricated metal post with glass ionomer modification (Miracle Mix) core build up.
