Journal of Oral Implantology August 2014 - (Page 449)

CLINICAL A Clinical Report on the Use of Closed-Tray, Hex-LockFriction-Fit Implant Impression Copings Eli Raviv, DMD1 Jan Hanna, DMD2 Roy Raviv, DMD2 Mili Harel-Raviv, DMD3* The precision of an impression determines the subsequent accuracy and fit of the final restoration. Therefore, the ultimate search is for the most accurate impression material and the most efficient and least time consuming technique. One of the major debates in implant dentistry has focused on the advantages of the pickup versus the transfer impression technique. The pick-up technique is widely accepted as the more accurate. However, the conventional transfer technique is simpler and less time consuming. The Hex-Lock-Friction-Fit impression coping (AB Dental Devices) combines the advantages of the transfer impression technique and the pick-up impression technique. In this article we will review the relevant literature, discuss the advantages of this unique implant impression technique, and present some related clinical cases. Key Words: implants, impression, transfer coping INTRODUCTION B iomedical engineering in the field of dental implants has undergone a drastic improvement in the past decade. As a result of advanced modern technologies, dental implants now have an exceptionally high success rate and can be said to last indefinitely.1 Advances include the development of the friction-fit abutment, which completely eliminates any micromovement of the abutment.2 There are now even one-piece implants that eliminate the implant-abutment interface and the need for a healing abutment altogether.3 However, despite all of these advances, the success of any dental implant restoration still relies on a primary step of the treatment process: the impression. A dental impression is a negative imprint of an oral structure used to produce a positive replica of the 1 Faculty of Dentistry, McGill University and Department of Dentistry, Jewish General Hospital, Montreal, Canada. 2 Multidisciplinary Residency Program, Department of Dentistry, Jewish General Hospital, Montreal, Canada. 3 Private practice, Montreal, Canada. * Corresponding author, e-mail: raviv.eli@gmail.com DOI: 10.1563/AAID-JOI-D-11-00056 structure for use as a permanent record or to produce a dental restoration or prosthesis.4 Traditionally, dentists have had to choose between 2 accepted techniques for implant impression taking: the pick-up open-tray technique or the transfer closed-tray technique. In choosing one over the other they have had to accept the weaknesses along with the strengths of the chosen technique. Practitioners continue to seek a technique that produces the most accurate results but is also efficient and easy to use. Impression accuracy has been tested by changing the impression material, by splinting or not splinting the impression copings, and by using transfer-type versus pick-up type impression copings.5 A transfer-type impression technique involves a closed tray and impression copings that are connected to the implants. When the impression is removed from the mouth, the copings remain intraorally. They are then removed and connected to the implant analogs; the copinganalog assembly is then placed in the impression.6,7 A pick-up impression technique traditionally uses an open tray. Before removing the impression, the copings are unscrewed from the implants and removed, together with the impression from the Journal of Oral Implantology 449

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

Helping, Rather Than Criticizing, a Colleague May Lead to a Lifetime of Referrals
Utilization of Ethyl Cyanoacrylate and 2-Octyl Cyanoacrylate Adhesives for Autogenous Bone Graft Fixation: Histomorphometric Study in Rats
Conventional Versus Implant-Retained Overlay Dentures: A Pilot Study of Masseter and Anterior Temporalis Electromyography
Axial Relationship Between Dental Implants and Teeth/Implants: A Radiographic Study
The Effect of Dynamic Loading on Bacterial Colonization of the Dental Implant Fixture–Abutment Interface: An In Vitro Study
Longitudinal Implant Stability Measurements Based on Resonance Frequency Analysis After Placement in Healed or Regenerated Bone
A Clinical Report on the Use of Closed-Tray, Hex-Lock-Friction-Fit Implant Impression Copings
Immediate Restoration of NobelActive Implants Placed Into Fresh Extraction Sites in the Anterior Maxilla
Clinical Study of Flap Design to Increase the Keratinized Gingiva Around Implants: 4-Year Follow-Up
Use of Subepithelial Connective Tissue Graft as a Biological Barrier: A Human Clinical and Histologic Case Report
Calvarial Autogenous Bone Graft for Maxillary Ridge and Sinus Reconstruction for Rehabilitation With Dental Implants
Staged Ridge Splitting Technique for Horizontal Expansion in Mandible: A Case Report
An Overview of Zirconia Dental Implants: Basic Properties and Clinical Application of Three Cases
Dental Gypsum Verification Jig to Verify Implant Positions: A Clinical Report
Platelet-Rich Preparations to Improve Healing. Part I: Workable Options for Every Size Practice
Platelet-Rich Preparations to Improve Healing. Part II: Platelet Activation and Enrichment, Leukocyte Inclusion, and Other Selection Criteria

Journal of Oral Implantology August 2014

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