Authors: Mohamed A. Ibrahim, Abdallah Mohamed Ibrahim, Wael S. Ahmed, Fatma Ahmad El-Waseef
Background: Rehabilitation of the edentulous mandible by single-implant mandibular overdenture (SIMO) has become commonplace as a simple modality. Notwithstanding, SIMO was reported to have a considerable drawback. The prevalence of overdenture fracture increased in the region adjacent to the implant.
Purpose: the purpose of the current study was to compare single implant mandibular overdenture (SIMO) reinforced by Co-Cr to SIMO reinforced by PEEK with respect to adaptation (Ridge base relation).
Materials and Methods: Fifteen completely edentulous participants (mean age 55 years) were involved in this within-patient study. All patients received conventional complete dentures before implant placement. Each participant received single implant in the midline of the mandible following the delayed loading protocol. After 3 months, the healing abutments were placed for one week, then each patient received ball abutment. According to the reinforcement material used in this study; each patient received two overdntures; PEEK and Co-Cr reinforced implant overdentures. The attachment housings were incorporated in the denture by direct pick up. The denture tissue relation was examined by CBCT scan using the dual scan procedure. On the CBCT scans, the area under the fitting surface of the implant overdentures was measured on 8 reference points. This area resembled the denture base relation.
Results: The results revealed that there was statistically significant improvement in ridge base relation in single-implant mandibular overdentures (SIMO) reinforced by PEEK compared to SIMO reinforced by CO-CR. Also, the results elaborated statistically significant improvement in ridge base relation of posterior areas of the denture compared to anterior areas.
Conclusion: Regarding single- implant mandibular overdenture SIMO, the denture base adaption of overdentures reinforced with PEEK framework was greater than denture reinforced with Co-Cr framework. Hence, applicability of PEEK material in reinforcing SIMO offers the patient a metal-free alternative with superior mechanical properties. Whereas, the denture base adaption much increased at the points that are far (posteriorly) from the implants.
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