Abstract
Objective: Stress analysis and retention evaluation of implant-retained mandibular complete overdenture with different clip materials and distributions. Methods: This in-vitro study was conducted over implants retained mandibular complete overdenture (all-on-4 concept) using BIOHPP bar attachments constructed using 3 D printing with different clip materials and distributions. This study consisted of 4 groups according to the type and distribution of clips: Group I: hard clips anteriorly and posteriorly, Group II: soft clips anteriorly and posteriorly, Group III: hard clips anteriorly and soft clips posteriorly, and Group IV: soft clips anteriorly and hard clips posteriorly. Stress analysis and retention were evaluated before and thermocycling afterward. Results: Comparison between stresses in each group before and after thermocycling in central and peripheral implants was performed, revealing stresses in all groups after thermocycling were significantly higher than before thermocycling as P < 0.05. Regarding retention, a comparison between all groups revealed a significant difference between them before and after thermocycling as P<0.05. Conclusion: There is no effect of clip material distribution regarding stress analysis and retention before and after thermocycling except stresses in central implant before thermocycling as soft clips anteriorly and hard clips posteriorly revealed significant lower stresses than hard clips anteriorly and soft clips posteriorly.
Highlights
Prosthetic rehabilitation of totally edentulous patients today is a common procedure that clinicians approach in their daily practice. [1] For the edentulous patients the result improved by using implant-supported overdenture if compared with a conventional denture
Comparison between the 4 groups was performed using One Way ANOVA which revealed a significant difference between them regarding central and peripheral implants in both before and after thermocycling as P < 0.05, Tukeys Post hoc test was performed for multiple comparisons and revealed a significant difference between means with different superscript letters as P
Stresses over the peripheral implant are higher than central implant, stresses increased and retention decreased after thermocycling in all groups
Summary
Prosthetic rehabilitation of totally edentulous patients today is a common procedure that clinicians approach in their daily practice. [1] For the edentulous patients the result improved by using implant-supported overdenture if compared with a conventional denture. [1] For the edentulous patients the result improved by using implant-supported overdenture if compared with a conventional denture. The “All on-4” concept is considered as an alternative and potential treatment to avoid complex techniques. This can be achieved by placing four implants, two straight implants anteriorly and two tilted ones with an angle of 30-45° in the posterior region. This improves anchorage of the implants since they engage cortical bone from the anterior part of the maxillary sinus and the nasal passage (nostril) and the inter-foraminal region in the mandible. Reconstructive surgeries or bone graft procedures are avoided it is less invasive and financially competitive. [4]
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