Abstract
Statement of Problem. Implant verification jigs are routinely used during the fabrication of implant-supported
prostheses. The dimensional accuracy of these jigs is unknown. Purpose. The purposes of this study were to (1) compare the dimensional accuracy of verification
jigs with that of conventional impression procedures and (2) measure the dimensional
accuracy of 3 resin materials used to fabricate verification jigs. Material and Methods. Thirty verification jigs and 20 impressions were made of 3 externally hexed Steri-Oss
implants in a master stone base according to the following groups (n = 10 per group):
(Group 1) Jig: GC pattern resin; (Group 2) Jig: Duralay resin; (Group 3) Jig: Triad
gel resin; (Group 4) Impression: closed-tray impression copings; and (Group 5) Impression:
open-tray impression copings. A stone base was fabricated for each experimental jig
and impression. Master stone base and experimental stone bases were measured with
the following methods: X and Y coordinates of each implant center were obtained with
a traveling microscope by averaging the X and Y coordinates of the implant external
hex corners. The origins of the coordinates during measurement of each base were arbitrary.
Distances between implant center points were calculated by use of the Pythagorean
theorem. Vertical measurements (Z-plane) were obtained with a digital caliper at the
2 terminal-implant locations. Interimplant distances and vertical measurements were
subtracted from those of the master base, and the resultant distortion values were
analyzed with analysis of variance and Tukey Studentized range tests. Statistical
significance was set at P<.05. Results. Verification jigs were not significantly more accurate than standard impression procedures.
Open-tray impressions showed a significantly greater vertical distortion (Z-R location:
262 ± 158 μm; P=.0001; Z-L location 333 ± 189; P=.0001) compared with the other groups. Triad gel jigs showed a significantly greater
distortion in one interimplant distance (C-L) than closed-tray impressions (P=.04), whereas Duralay jigs exhibited significant greater distortion than closed-tray
and open-tray impressions in the interimplant distance R-C (P=.006). Although not significantly different from other groups, the closed-tray group
showed the lowest mean distortion values in all measurements. Conclusion. Within the limitations of this study, the accuracy provided by verification jigs
was not significantly superior to standard impression procedures. The results suggest
that jig fabrication does not improve the dimensional accuracy of stone casts. Open-tray
impressions showed a significantly greater inaccuracy in the vertical plane. (J Prosthet
Dent 2002;88:329-36.)
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Article info
Footnotes
☆1This study was supported in part by a 2000 Stanley D. Tylman Research Grant from the American Academy of Fixed Prosthodontics and a Greater New York Academy of Prosthodontists Student Research Grant.
☆2Reprint requests to: Dr. Carlo Ercoli, University of Rochester, Eastman Dental Center, 625 Elmwood Ave., Rochester, NY 14620, Telephone: (716) 275-5042, Fax: (716) 244-8772, E-mail: [email protected]
☆3aResident, Division of Prosthodontics, Eastman Dental Center.
☆4bProfessor, Department of Mechanical Engineering and Materials Science, College of Applied Science.
☆5cAssistant Professor and Program Director, Division of Prosthodontics, Eastman Dental Center.
☆6dAssistant Professor, Eastman Dental Center.
☆7eProfessor and Chief, Division of Prosthodontics, Eastman Dental Center.
☆8fProgram Director, TMJD Program. Professor, Division of Prosthodontics and Orthodontics, Eastman Dental Center.
Identification
Copyright
© 2002 Editorial Council of The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
