Journal of AdvancedMedical and Dental Sciences Research

Background: Wear of tooth structure is a natural process which may be accelerated by the introduction of restorations whose properties of wear differ from those of the tooth structure that they slide against. It is desirable that wear behavior of restorative materials is similar to natural enamel, because excessive wear could lead to clinical problems such as damage of teeth occluding surfaces, loss of vertical dimension of occlusion etc. Hence, the present study was undertaken to evaluate and compare the fracture resistance of a single molar crown made of two different ceromer systems. Materials & methods: The present study included assessment of 40 extracted mandibular second molar teeth.  An initial impression was taken from each tooth by using alginate, then all of them poured with plaster stone, and the primary casts of all teeth prepared.  Every impression was checked on its occlusal and marginal surface for any bubble or inaccuracy. Master dies (n = 20) were randomly divided into two groups. One group was used to make single crowns made of Signum+. GC Gradia while the other material used was microceramic composite. Fracture strength testing of ceromer crowns was performed using a universal testing machine. All the results were recorded and analyzed by SPSS software. Results: Gc Gradia showed fracture strength of 2785 N. Mean fracture strength showed by Signum plus is 2236 N. Conclusion: Higher fracture resistance is present in case of GC Gradia which, therefore can be used more frequently in the clinical settings.
Key words: Ceromer, Fracture resistance, Molar