The Fracture Pattern of Different Mandibular Over–Denture Designs

Aims: To evaluate the load at fracture for different mandibular over–dentures and the positions of the fracture area for these designs. Material and methods: Ten mandibular dentures were made, each of two designs. The first design consisted of acrylic resin over–denture supported by two dome–shaped 3 mm mandibular canines copings, the second design consisted of two dome–shaped copings connected with a rigid metallic bar. The mean and standard deviation were calculated in addition to the analysis of variance which showed a significant difference at P < 0.05. Results: Showed that the over–denture supported by two dome shaped mandibular canines were more fracture resistance than the over–denture supported with the bar. The fracture position depends on the denture design. Conclusions: The results indicated that the denture made entirely of acrylic resin was much more stronger than the denture with less thickness due to the incorporation on metallic rigid bar.