Aim: This study was conducted to evaluate radiographically the effect of nano-hybrid composite resin teeth on mandibular residual ridge using cone beam computerized tomography (CBCT). A comparative study. Materials and Methods: Twelve completely edentulous male patients were randomly divided into two groups according to the artificial tooth material used in complete denture construction. One group received complete dentures with nano-hybrid composite resin teeth and the other group received complete dentures with cross-linked acrylic resin teeth. CBCT was taken at the delivery, 6 months and 12 months follow-up appointments. The evaluation was done for height and width changes of the mandibular residual alveolar ridge at different anatomical sites either in the anterior or posterior part of the mandible. Results: Analysis was done by using two-tailed t-test revealed that increase in amount of bone loss in both groups which is in favor to patients wearing dentures with nanohybrid composite resin teeth, with no statistically significant difference between the two groups. Conclusion: Despite of introduction of new denture tooth material as nanohybrid composite resin teeth, the cross-linked acrylic resin teeth still considered the gold standard denture teeth regarding the degree of occlusal force transmission and preservation of residual alveolar ridge.

Introduction: Addition of nanofillers to the denture base material in order to enhance its mechanical properties may contribute to the dimensional accuracy of the processed dentures. Aim: This study was conducted to investigate the effect of zirconium oxide nanofillers addition on the dimensional accuracy of maxillary heat cured acrylic dentures. Materials and Methods: Thirty six identical maxillary waxed up dentures were constructed, divided into two equal groups(n=18), control group processed into conventional heat cured acrylic resin dentures and test group processed into 5% zirconium oxide nanofiller reinforced heat cured acrylic resin dentures. Teeth movements were estimated linearly using digital software after processing and vertically using digital caliper before and after processing. Changes in denture adaptation were measured immediately after processing and after seven days hydration in distilled water using digital software. Results: After processing, both groups showed increased Vertical dimension of occlusion with less increase with the test group. Both groups showed changes in teeth position with non-significant difference. Test group showed more tendency to inward tooth movement. Test group showed significant more denture adaptation after processing. However, denture hydration caused decrease in denture adaptation in the test group while causing enhancement in denture adaptation with the control group. Conclusion: Zirconium oxide nanofillers reinforcement showed nearly comparable results of dimensional accuracy to the conventional dentures with negative results on hydration.