PDF: Marginal Bone Changes on Ultraclean, Micro-Threaded Platform-Switched Implants Following Restoration: 1- to 4-Year Data

The aim of this clinical study was to retrospectively evaluate changes in bone following final abutment insertion and functional loading and to evaluate bone status relative to implant type, width, and length; placement into healed bone and extraction sockets; immediate provisionalization; abutment type (single-unit, multi-unit, cementable stock abutment, custom abutment, ti-base, UCLA); cementable restoration, screwretained restoration, splinted restoration, and single-unit restoration.

Bone is and has been a primary consideration in dental implant treatment. Adequate bone, determined by analysis of its height, width, and density as well as forces to be placed on the implant, is required at the time of implant placement to provide for the critical criterion ofinitial implant stability.

Without sufficient bone to stabilize the implant, micromovement may occur and result in a fibrous tissue interface with the implant. 

Equally important is bone maintenance at the implant-to-bone interface over time following prosthetic restoration of the implant. Minimum standards were set many years ago for what was considered acceptable bone loss over time and at what rate. 

These standards were established based on what was observed to occur to a commercial, pure titanium machined-surface implant over time. It was accepted that up to 2 mm of initial bone loss would occur in the first year of restoration, followed by continuing bone loss of no more than 0.2 mm per year thereafter.

The aim of this study was to evaluate bone changes on an implant system (Paltop Implant System, Paltop Advanced Dental Solutions Ltd/Keystone Dental Inc, paltopdental.com) with an ultrapure sandblasted microetched titanium alloy surface (2 µm to 3 µm roughness) that covers the platform switch, on consecutive cases in a single practitioner’s office following final abutment insertion and functional loading. 

This retrospective study evaluates the incidence of bone changes over time and attempts to identify the factors that affect these bone changes. 

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