It may be concluded from this study that although internal connections are clinically favored, this study did not show any advantage relative to screw loosening. However, screw design may be a significant factor in loosening of the joint.

The O-ring is used to increase retention of implant complete and partial overdenture prostheses. They possess a number of advantages, including ease of use and maintenance, low cost, and possible elimination of a superstructure bar. O-rings wear over time, gradually lose retention, and must be replaced periodically. It is essential that O-ring abutments be parallel to each other. Two cases are presented showing the use of O-rings with a complete mandibular implant overdenture and a maxillary removable partial denture.

Computer-assisted design (CAD) and computer-assisted manufacture (CAM) are technologic advancements used in dentistry today. These technologies have been developed to fabricate a complete arch substructure from a solid piece of titanium for a fixed, screw-retained implant-supported prosthesis. This clinical report demonstrates a treatment approach which uses CAD-CAM technology to incorporate a milled, titanium framework with retrievable metal ceramic crowns.

Full-arch implant-supported restorations using a metal-acrylic resin design have had a high success rate but are also associated with frequent technical complications including framework misfit due to casting errors, debonding of denture teeth, and fracture of the acrylic from the metal framework. This clinical report describes a case of maxillary and mandibular full-arch implant-supported rehabilitation associated with technical and biological complications and use of digital technology for fabricating monolithic restorations. The use of a bio-functional try-in and its subsequent use as a conversion prosthesis for fabricating a master cast is described. The use of the patient's existing metal bar to fabricate a retread type prosthesis is also described along with using digital technology for fabricating a new metal bar and a monolithic type of restoration. The integration of digital and conventional workflows to obtain an increased level of accuracy and simplicity is also discussed.

Satisfactory function, esthetics, phonetics, together with long term stability, and minimal complications are considered as metrics defining a successful outcome. The current case report is documentation of a mandibular subperiosteal implant with a successful follow up of 56 years. Numerous issues can be credited for the long-term successful outcome including selection of the patient, heedfulness of basic anatomic and physiologic principles, design of the implant and superstructure, surgical execution, application of sound restorative principles, conscientious hygiene, and clockwork re-care. The case demonstrates intense cooperation and coordination between the surgeon, restorative dentist, laboratory technical staff, together with long lasting patient compliance. Execution of the treatment with a mandibular subperiosteal implant helped this patient overcome the status of a dental cripple. The highlight of the case is that it is the longest success ever documented in the history of any type of implant treatment.