The effect of BioHPP versus Zirconia CAD/CAM-fabricated fixed-detachable prosthesis rehabilitating single maxillary arches on the peri-implant bone level changes

Purpose: The objective of this study was to compare the use of BioHPP and zirconia CAD/CAM fabricated materials in
implant supported maxillary fixed-detachable prosthesis opposing dentate mandibular arch, where peri-implants bone level
changes were evaluated for two years.
Materials and method: Ten patients with edentulous single maxilla opposing dentate mandibular arch were selected to
share in this study. For all patients, proper planning for implant placement was made where the participants were randomly
allocated into two groups five patients in each group. Six implants were inserted guided by the sterolithographic surgical guide
following flapless surgical approach. Immediate loading protocol was followed, where the milled acrylic temporary prosthesis,
which was planned for each patient according to the computer software, was screwed to the implants. After 4 months, the
final restoration was placed according to the following grouping. In group I, patients were rehabilitated with fixed-detachable
zirconium restoration while in group II patients were rehabilitated with fixed-detachable BioHpp Peek restoration. Peri-implant
marginal bone changes were evaluated at loading time, after 6 month, 1 and 2 years follow up visits. Data collected were
tabulated and statistically analyzed.
Results: In intragroup comparisons, peri implant bone loss was significant. Where in group I, the mean value of peri–implant
bone height change measures from implants insertion to 6 month was 0.35 mm, from insertion to 12 months was 0.62 mm while
from insertion to 24 months follow up was found to be 0.96 mm. While in group II at same time intervals were 0.39 mm, 0.69
mm and 1.23 mm respectively. On the other hand in intergroup comparison, to compare the mean amount of peri-implant bone
height changes in the two studied groups during the follow up intervals, student t test was performed and showed that group II
had a non significant higher bone loss.
Conclusion: Based on these results and within the limitation of this study. Both Zirconia and BioHpp when used as framework
material for fixed-detachable maxillary single prosthesis had successful results on the supporting implants. However, BioHpp
fixed-detachable prosthesis had higher effect on the peri-implant marginal bone loss but it was not of statistical significance.