Comparison of Prefabricated and Custom-Made Bars Used for Implant-Retained Mandibular Complete Overdentures

Abstract

The prefabricated bar overdentures showed less bone resorption distal to the implants in comparison with the cast bar implant-retained overdentures, Both the gingival index and the plaque index score were significantly higher in the group treated with the cast bar retained overdenture. The prefabricated bar implant-retained overdenture showed low significant reduction in the bone height after 1 year, and a very highly significant reduction after 18 months.

A Retrospective 2‐Year Clinical Study of Immediate Prosthetic Rehabilitation of Edentulous Jaws with Four Implants and Prefabricated Bars

“…In a clinical study prefabricated bars were compared to custom‐made bars used for implant‐retained mandibular complete overdentures . The authors stated that the increase in bone loss recorded (18‐month follow‐up) in the cast bar group was more than in the prefabricated bar group, perhaps attributable to the accuracy in fabrication of the prefabricated bar, where it has a high‐polished surface, precision, and stress‐free properties.…”

“…In a clinical study prefabricated bars were compared to custom-made bars used for implant-retained mandibular complete overdentures. 14 The authors stated that the increase in bone loss recorded (18-month follow-up) in the cast bar group was more than in the prefabricated bar group, perhaps attributable to the accuracy in fabrication of the prefabricated bar, where it has a high-polished surface, precision, and stress-free properties. These results may be attributed to the difference in the amount of load transmitted to the supporting structures by a rigid cast bar unit and a relatively flexible prefabricated bar joint used to retain the mandibular overdentures.…”

“…Prospective, and retrospective clinical results on the immediate‐function concept by combining two vertical and two tilted implants with an acrylic resin interim full‐arch fixed prosthesis reported cumulative survival rates between 92.2% and 100% . Different prosthetic designs as well as multiple types of materials have been used to fabricate prosthetic frameworks . A truly passive fit of screw‐retained prostheses onto both vertical and tilted implants has been reported to be mandatory to avoid tensile, compressive, and bending forces, which may be dangerous for the osseointegration process and/or result in failure of the components .…”

“…11,12 Different prosthetic designs as well as multiple types of materials have been used to fabricate prosthetic frameworks. 13,14 A truly passive fit of screw-retained prostheses onto both vertical and tilted implants has been reported to be mandatory to avoid tensile, compressive, and bending forces, which may be dangerous for the osseointegration process and/or result in failure of the components. [15][16][17][18][19] However, some studies have found that dental implants tolerate certain levels of misfit.…”

Implant-supported overdentures with different bar designs: A retrospective evaluation after 5-19 years of clinical function

“… 9 10 It has been proven that the bone resorption for IODs on prefabricated bars is lower in comparison with IODs on cast bars. 11 In contrast, a systematic review demonstrated similar bone loss around implants supporting IODs with different attachment designs. 12 This retrospective study examined the survival and success rates as well as the prevalence of peri-implantitis of IODs retained by 3 different bar designs.…”