Abstract:
Purpose: The aim of this study was to evaluate clinical and radiographic outcomes of
polyetheretherketone (PEEK) hybrid prosthesis used for “All on four” rehabilitation of edentulous
maxilla.
Materials and methods: Six patients with atrophied edentulous maxillary ridges were
managed by 4 implants according to the “All on four” protocol using computer guided surgery
and flapless surgical approach. The existing maxillary dentures were placed immediately after
modifications on the same day. After 6 months, the definite prosthesis consisted of screw retained
milled BioHPP framework bonded to acrylic resin teeth and denture base. The prosthesis restored
lost teeth, hard and soft tissues (hybrid fixed prosthesis). Plaque and gingival index, probing depth,
implant mobility and bone loss (measured by standardized periapical radiographs) were evaluated
after prosthesis delivery (T0), six months (T6) and 12 months (T12) after delivery.
Results: Two implants failed in one patient resulting in 91.7% survival rate. Plaque index
increased with time. No difference in gingival index, pocket depth, implant stability, and vertical
bone loss between observation times was noted. Posterior implant showed higher plaque scores and
pocket depth than anterior implants after 6 and 12 months and no significant difference in all other
parameters between anterior and posterior implants was noted.
Conclusion: Within the limitation of this study, PEEK hybrid prosthesis bonded to acrylic
resin teeth and denture base can be used successfully to rehabilitate patients with atrophic maxilla
according to “All on four” concept as it was associated with favourable clinical and radiographic
outcomes after one year
