Comparative study between two different designs of four implants placement supporting mandibular overdenture: Review article

Document Type : Original research papers


1 Prosthodontics, Faculty of Oral and Dental Medicine, Delta University, Mansoura, Dakahlya, Egypt.

2 Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Dakahlya, Egypt

3 Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Dakahlya, Egypt.


Edentulous patients are often associated with decreased in the masticatory function, loss in vertical dimension, speech impairment and poor esthetics due to loss in facial musculature support. The traditional way for treating edentulous patients is a complete removable denture. However, the progressive tissue changes occur due to wearing the denture should be compensated by denture adjustment. In completely edentulous patients the implant supported overdentures is a common treatment plan which could improve oral function and comfort for edentulous patients. The concept of rehabilitation of full arch on four implants is a useful therapy in the treatment of an edentulous patient. The quadrilateral design showed enhanced results in regard to survival and success rate and minimal strain compared to curved (three implants) or linear (two implants) designs. Tilting the distal implant giving us various advantages as the implant reach a more posterior position so the length of the cantilever is reduced. Also it preserves related vital structures, avoid bone grafting and allows using longer implants that increases the implant primary stability due to increased implant-to-bone contact area, increases the inter-implant space, lead to better load distribution. The rehabilitation of edentulous mandible with telescopic overdenture supported by four parallel implants was a successful treatment option however, tilting the posterior implants 30 degree distally might present a several advantages regarding the increased anteroposterior spread which in turn decrease the load transmitted to the implant.


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