Objectives: This research was carried out to evaluate radiographically the effect of different denture base materials “poly methyl methacrylate base (PMMA) processed by conventional technique versus thermoplastic biocompatible (Polyan IC) base processed by injectable mold technique on the prei-implant bone height changes of partially palatal coverage mucosal-implant retained maxillary overdenture.
Materials and Methods: Totally, fourteen completely edentulous participants were equally assigned into two groups (G1 and G2). Each group has received four implants (3mm diameter and 12 mm length), two in the lateral region, and two in the first premolar region. All the participants received partial palatal coverage complete implant overdentures retained by four O-rings. G1 participants have received PMMA denture base processed by conventional method. G2 participants have received Polyan IC denture base processed by using injectable mold. In this Study, crestal bone height changes around each implant were evaluated at time of prostheses insertion, six month and one year later using CBCT.
Results: In this study, at the end of follow up period, there was statistically significant difference in the marginal bone height loss between the two groups. The least bone loss was reported around the implants in group 2. After six months, the mean difference of bone height loss were (0.65±0.14) and (0.33±0.09) while from six to twelve month, the mean difference of bone height loss were (0.37±0.11) and (0.20±0.08) in group 1 and group 2 respectively
Conclusion: Within the limitation of this study, it was concluded that Polyan IC denture base processed by using injectable mold may yield more predictable bone/implant interface and may ensure well fitted denture base compared to PMMA denture base processed by conventional method, when partially palatal coverage mucosal-implant retained maxillary overdenture were used.