J Adv Prosthodont.  2011 Dec;3(4):177-185. 10.4047/jap.2011.3.4.177.

Accuracy of five implant impression technique: effect of splinting materials and methods

• Lee SJ
• Cho SB

• KMID: 2054751
• DOI: http://doi.org/10.4047/jap.2011.3.4.177

Abstract

PURPOSE
The aim of this study was to evaluate the effect of dimensional stability of splinting material on the accuracy of master casts.
MATERIALS AND METHODS
A stainless steel metal model with 6 implants embedded was used as a master model. Implant level impressions were made after square impression copings were splinted using 5 different techniques as follows. (1) Splinted with autopolymerizing resin and sectioned, reconnected to compensate polymerization shrinkage before the impression procedure. (2) Splinted with autopolymerizing resin just before impression procedure. (3) Primary impression made with impression plaster and secondary impression were made over with polyether impression material. (4) Splinted with impression plaster. (5) Splinted with VPS bite registration material. From master model, 5 impressions and 5 experimental casts, total 25 casts were made for each of 5 splinting methods. The distortion values of each splinting methods were measured using coordinate measuring machine, capable of recordings in the x-, y-, z-axes. A one-way analysis of variance (ANOVA) at a confidence level of 95% was used to evaluate the data and Tukey's studentized range test was used to determine significant differences between the groups.
RESULTS
Group 1 showed best accuracy followed by Group 3 & 4. Group 2 and 5 showed relatively larger distortion value than other groups. No significant difference was found between group 3, 4, 5 in x-axis, group 2, 3, 4 in y-axis and group 1, 3, 4, 5 in z-axis (P<.0001).
CONCLUSION
Both Splinting impression copings with autopolymerizing resin following compensation of polymerization shrinkage and splinting method with impression plaster can enhance the accuracy of master cast and impression plaster can be used simple and effective splinting material for implant impression procedure.

Keyword

Passive fit; Splinting; Autopolymerizing resin; Impression plaster; VPS bite registration material

MeSH Terms

Compensation and Redress
Humans
Jaw Relation Record
Polymerization
Polymers
Splints
Stainless Steel
Polymers
Stainless Steel

Figure

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  Fig. 1 Stainless steel master model simulating fully edentulous condition.

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  Fig. 2 Open-top, custom impression tray incorporating 6 squared transfer copings was fabricated using light-polymerizing tray material (Triad Tru-Tray; Dentsply International Inc, York, PA, USA).

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  Fig. 3 Six squared transfer copings (29072; Nobel Biocare, Göteborg, Sweden) connected on each fixture with guide pins.

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  Fig. 4 Group 1. Squared transfer copings splinted with autopolymerizing acrylic resin (GC pattern resin, GC Corp, Tokyo, Japan) for 24 hours and sectioned, reconnected just before impression procedure.

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  Fig. 5 Group 2. Squared transfer copings splinted with autopolymerizing acrylic resin 17 minutes before impression procedure.

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  Fig. 6 Group 3. Primary impression was made with impression plaster (Snow-White plaster No.2; Kerr, Romulus, MI, USA) following manufacturer's instruction and then secondary impression was made with polyether impression material. The polyether adhesive was applied onto primary impression (blue color).

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  Fig. 7 Group 4. Squared transfer copings splinted with impression plaster (Snow-White plaster No.2; Kerr, Romulus, MI, USA) over dental floss.

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  Fig. 8 Group 5. Squared impression copings splinted with VPS bite registration material (Blu-Mousse, Parkell Bio-Materials, Farmingdale, NY, USA).

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  Fig. 9 Polyether impression material (Impregum F, 3M ESPE, Seefeld, Germany) was used for group 1 to 4 (left) and VPS impression material was used for group 5.

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  Fig. 10 From master model, 5 impressions and experimental models were made for each splinting method.

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  Fig. 11 All measurements were made by the same operator using STRATO Bright coordinate measuring machine, TP7M signal probe and Geopak-win software (Mitutoyo Corporation, Tokyo, Japan).

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  Fig. 12 Schematic drawing of measurement done by STRATO Bright 710 coordinate system.

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