Principles of Attachment Selection for Implant Supported Overdentures
| Principles of Attachment Selection for Implant Supported Overdentures | Hamid Shafie, DDS* and George Obeid, DDS** |
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monocline Zirconia particles and results in a tetragonal crystalline structure, where the particles appear to overlap. (Fig. 21B) This innovation imparts the ability to stop crack propagation. When the surface of HIP-processed Zirconia is prepared, any micro-cracks that might result are quickly stabilized because the tetragonal particles expand to the monocline structure and fill the void. This self-repairing property is also known as the “airbag effect”. The additional stability gained by the HIP process has enabled Zirconia to be used for multiple medical prosthetic devices, including auditory, finger, and hip prostheses. Zirconia has proven its utility in dental implants through a series of animal and human clinical studies wherein it has been shown to successfully osseointegrate into bone and be highly biocompatible.44
Zirconia dental implants have been available commercially since 2004. The current major player in the United States is Z-Systems® with their Z-Look3® Lock Ball overdenture implant. The Z-Look3® is an FDA-approved permanent implant system. This implant is made of HIP Zirconia and it surface has been basted to increase surface area and osseointegration. (Fig. 21C) Its diameter is 4.0 mm with a 2.9 mm ball attachment. (Figs. 21D, 21E) Clinical benefits of the Lock Ball implant include its one-piece construction, so there is no micro gap, and there are no wrong or missing parts regarding the attachments. Its white color eliminates any “tattoo” effect or grey shadow. It has a very good soft tissue response, and because no second surgery is needed, time is saved. |
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