A comparison between 4 and 6 implants in the maxillary posterior region to support an overdenture; 1‐year results from a randomized controlled trial

Abstract

A bar-supported overdenture on 4 implants in the posterior maxillary region is not inferior to an overdenture supported by 6 bar-connected dental implants.

Comparative study of splinted and unsplinted implant-retained maxillary overdentures without palatal coverage: A literature review

“…Some studies presented a variable number of dental implants rating to four to six implants per patient [20][21][22][23][24][25][26] and others employed a fixed number like four [27,28] or six dental implants [29,30]. The same variation occurred to anchorage design.…”

“…The same variation occurred to anchorage design. The follow-up period ranged from twelve [23,24] to two hundred fifty eight months [31] in splinted design and forty eight [21] to one hundred seven months [26] in unsplinted design.…”

“…In total, 1626 implants were osseointegrated in 345 patient's maxillaries, excluding implants failures that occurred at healing phase, a total failure of 79 maxillary implants associated to the IODs without the palatal coverage was obtained. The general variation noted was 86.1% [30] to 100% [21][22][23][24][25] on the survival rate of maxillary dental implants. The maxillary implants survival rate in implant-supported overdentures (PR4) by four dental implants ranged from 96.7% [27] to 100% [21][22][23][24][25] and implant-retained and mucosupported (PR5) by four implants ranged from 95,5% [20] to 100% [21,25,26].…”

“…The number of implants placed to support IOD without palatal coverage in the studies and the number of implants lost were identified. Those articles that addressed a variation in the implants number installed in the IOD support, only five identified specifically the number of implant which failed [23,24,29,31] and one did not differentiated the number of implants lost [20]. …”

Title: “Kelly’s Syndrome”- prevention, using Implant Supported Hybrid Denture: Clinical Considerations and Case Report with 5 year follow up.

“…In the case of fixed restorations in the maxilla, as is the case of the hybrid prosthesis, the literature suggests the placement of 4 to 8 implants distributed bilaterally in the maxillary arch. [6] …”