Journal of Oral Implantology December 2014 - (Page 722)

CASE REPORT The 2-Visit CAD-CAM Implant-Retained Overdenture: A Clinical Report Avinash S. Bidra, BDS, MS Recently, computer-aided technology has become commercially available in the United States for fabrication of complete dentures. Manufacturers offering this technology require exclusive clinical and laboratory protocols that sharply contrast with the traditional paradigms of complete denture therapy. These protocols allow fabrication of complete dentures in only 2 clinical appointments. Currently, there are no clinical reports in the scientific literature describing the use of this technology for overdentures. This article describes the successful use of computer aided design-computer aided machining (CAD-CAM) technology for prosthodontic phase of fabrication of a mandibular implant-retained overdenture in only 2 clinical appointments. A discussion of the techniques, rationale, indications, advantages, and disadvantages of using CAD-CAM technology for complete dentures and overdentures are described in this article. Key Words: CAD CAM dentures, digital dentures, implants, mandibular overdentures INTRODUCTION T he acronym computer aided designcomputer aided machining (CAD-CAM) is commonly used in prosthodontics to denote computer-aided design-computer-aided manufacturer (or computer assisted machining).1 It is a subtractive method of manufacturing that uses images from a digital file for creation of an object by machining (cutting/ milling) to physically remove material to achieve the desired geometry.2 This is in contrast to the additive method of manufacturing (such as rapid prototyping), where images from a digital file are used for creation of an object by laying down successive layers of a chosen material. The subtractive method of manufacturing is widely popular in fixed prosthodontics for fabricating inlays, onlays, and single crown restorations in a single clinical visit using a chairside CAD-CAM machine.3 It is also popular for fabricating abutments and substructures in the dental laboratory in the field of implant prosthodontics. In contrast, removable prosthodontics has Department of Reconstructive Sciences, University of Connecticut Health Center, Farmington, Conn. Corresponding author, e-mail: DOI: 10.1563/AAID-JOI-D-12-00237 722 Vol. XL /No. Six /2014 been slower in adopting this technology. There are a few reports in the literature that describe clinical use of CAD-CAM technology for fabricating metal frameworks for removable partial dentures.4-6 However, hardly any reports exist in the literature that describe clinical use of this technology for complete dentures. This is probably due to the inherent nature of fabricating complete dentures, which includes multiple steps of recording, transferring, testing, and then creating artificial substitutes of teeth and gingiva, all of which are required to be in harmony with the patient's mouth and face. Historically, computer-aided technology for complete dentures has encompassed additive manufacturing (such as rapid prototyping) as well as subtractive manufacturing (such as CAD-CAM). Maeda et al7 are credited with the first published report in English language scientific literature on the concept of using computer-aided technology for complete dentures. They used rapid prototyping technology for fabricating a complete denture from light polymerized composite resin material. The authors acknowledged that although much improvement was needed before clinical applicability, their method provided proof of concept that complete dentures could be fabricated using computer-aided technology. Since this report,

Table of Contents for the Digital Edition of Journal of Oral Implantology December 2014

Effect of Splinting in Accuracy of Two Implant Impression Techniques
Assessment of the Stress Transmitted to Dental Implants Connected to Screw-Retained Bars Using Different Casting Techniques
Retentiveness of Various Luting Agents Used With Implant-Supported Prosthesis: An In Vitro Study
Role of rhBMP-2 and rhBMP-7 in the Metabolism and Differentiation of Osteoblast-Like Cells Cultured on Chemically Modified Titanium Surfaces
Coated vs Uncoated Implants: Bone Defect Configurations After Progressive Peri-implantitis in Dogs
Why Guided When Freehand Is Easier, Quicker, and Less Costly?
Advanced Platelet-Rich Fibrin: A New Concept for Cell-Based Tissue Engineering by Means of Inflammatory Cells
Flapless Alveolar Ridge Preservation Utilizing the ‘‘Socket-Plug’’ Technique: Clinical Technique and Review of the Literature
Implants Placed in the Nasopalatine Canal to Rehabilitate Severely Atrophic Maxillae: A Retrospective Study With Long Follow-up
Severe Mandibular Atrophy Treated With a Subperiosteal Implant and Simultaneous Graft With rhBMP-2 and Mineralized Allograft: A Case Report
Full-Mouth Rehabilitation of a Patient With Ectodermal Dysplasia With Dental Implants
The 2-Visit CAD-CAM Implant-Retained Overdenture: A Clinical Report
Assessment of Implant-Related Treatment With Edited Three-Dimensional Reconstructed Images From Cone-Beam Computerized Tomography: A Technical Note
Retrieval of a Separated Implant Screwdriver Fragment
Correction of Esthetic Complications of a Malpositioned Implant: A Case Letter
Fixed Partial Denture Treatment With Mini Dental Implants
Replacement of an Implant and Prosthesis in the Premaxilla Due to a Malposition and Prosthetic Failure: A Clinical Case Letter
A New Restorative Technique for the Perishing Implant Due to Abutment Screw Fracture
Fit of CAD/CAM Implant Frameworks: A Comprehensive Review

Journal of Oral Implantology December 2014