Impression techniques

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IMPRESSION TECHNIQUES FOR IMPLANT PROSTHESES

IMPRESSION TECHNIQUESFOR IMPLANT PROSTHESES AAMIR GODIL FIRST YEAR P.G.DEPARTMENT OF PROSTHODONTICSM.A.R.D.C.

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OUTLINEINTRODUCTIONMATERIALS REQUIREDIMPRESSION TECHNIQUESGINGIVAL MASKINGERRORSLITERATURE REVIEWCONCLUSION

INTRODUCTION

Accurate recording of spatial implant position is required to obtain a proper support to definitive restoration with passive fitting. Conrad et al (2007)

Implants V/S Crowns and Bridges

It is more critical to record 3- dimensional position of the implants as they occur intraorally. Natural teeth have a PDL to compensate for minor inaccuracies while implants have not. Pesun IJ (1997)

WHY SHOULD YOU MAKE IMPLANT IMPRESSIONS?

WHAT ALL DO YOU NEED TO MAKE IMPLANT IMPRESSIONS?

WHICH IMPRESSION MATERIAL TO CHOOSE?

HOW TO MAKE AN IMPRESSION FOR IMPLANT PROSTHESES?

IMPLANT LEVEL IMPRESSIONS

IMPLANT LEVEL IMPRESSION TECHNIQUES

CLOSED TRAY IMPRESSION TECHNIQUE

SPLINTING FOR MULTIPLE IMPLANT IMPRESSIONThe common practice of joining the direct transfer copings with acrylic resin is an attempt to stabilize the copings against rotation during fixture or abutment analog fastening control the relationship between implants in a rigid fashion

(Spector MR, Donovan TE, Nicholls JI. An evaluation of impression techniques for osseointegrated implants.J Prosthet Dent 1990;63:444447)

Assif et al. and Naconecy et al. showed that splinting technique was significantly more accurate than unsplinted techniques

(Assif D, Marshak B, Schmidt A. Accuracy of implant impression techniques. Int J Oral Maxillofac Implants 1996;11:216222)(Naconecy MM, Teixeira ER, Shinkai RS, Frasca LC, Cervieri A. Evaluation of the accuracy of 3 transfer techniques for implant-supported prostheses with multiple abutments. Int J Oral Maxillofac Implants 2004;19:192198)

OPEN TRAY IMPRESSION TECHNIQUE

STEPS IN SPLINTING MULTIPLE IMPLANTS FOR IMPRESSION

Autopolymerising resin (sectioned and reconnected)

Impression Plaster (PI) and Polyether (FI)Impression Plaster

Autopolymersing resin at the time of impression3. VPS bite registration materialJ Adv Prosthodont. 2011 Dec;3(4):177-85

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ABUTMENT LEVEL IMPRESSIONS

DIRECT- ABUTMENT LEVELIMPRESSION TECHNIQUE

INDIRECT- ABUTMENT LEVEL IMPRESSION TECHNIQUE

GINGIVAL MASKING

WHAT SHOULD YOU SEND TO THE LAB?

WHAT ARE THE PROBABLE ERRORS?HOW DO YOU MINIMIZE THEM?

VERIFY THE SEATING OF COMPONENTS

IMPROPER INTERFACE BETWEEN IMPRESSION POST AND IMPLANT ANALOGUE

ERRORS IN IMPRESSION MAKING Latex gloves with PVS impression material Non-uniform thickness of material

LITERATURE REVIEW

Three-Dimensional Accuracy of Implantand Abutment Level Impression Techniques: Effect on Marginal DiscrepancyWith comparison of different impression methods, including abutment level and implant level (closed tray and open tray), no significant difference was noted

Journal of Oral Implantology

CONCLUSION

Precise impression methodology would decrease the failures related to the supra structure fabricationOzkane, 2006

Imprecise superstructure fit results in mechanical and biologic consequences that disrupt the function of dental implantsHeather J. et al, 2007

Thank You