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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