Evaluation of Clinical Soft Tissue Parameters for Extramaxillary Zygomatic Implants and Conventional Implants in All-on-4 Hybrid Rehabilitations: Short-Term Outcome and Proposal of Clinical Recommendations for Intervention in Recall Appointments.

PURPOSE: This prospective cohort study aimed to investigate the short-term soft tissue clinical outcomes and recommendation for evaluation and follow-up after a new hybrid All-on-4 rehabilitation.
METHODS: Forty consecutively included patients rehabilitated in the complete edentulous atrophic maxillae through a hybrid All-on-4 treatment concept (4 immediate function implants in a combination between zygomatic and conventional implants). Periimplant conditions at zygomatic and conventional implants were compared. Four clinical levels (CLs) were used to classify the presence and severity of periimplant conditions.
RESULTS: Four patients withdrew from the study. No significant differences were found for periimplant conditions at zygomatic and conventional implants. The distribution was 28, 2, 1, and 9 patients with CL1, CL2, CL3, and CL4, respectively.
CONCLUSIONS: Soft tissue clinical outcomes of extramaxillary zygomatic implants and conventional implants seem to follow a similar distribution. The proposed classification system stratifies patients, supports decision making, and with further validation may elucidate recommendations for frequency of recall appointments and intervention to enhance long-term success.