J Adv Prosthodont.  2013 Aug;5(3):219-225. 10.4047/jap.2013.5.3.219.

Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems

Affiliations
  • 1Seoul Highan Dental Clinic, Daejeon, Republic of Korea.
  • 2Department of Dentistry, St. Vincent Hospital, Catholic University of Korea, Suwon, Republic of Korea.
  • 3Department of Prosthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea. pros53@snu.ac.kr, jhoyang@snu.ac.kr

Abstract

PURPOSE
Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system. The purpose of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metal-ceramic FPDs.
MATERIALS AND METHODS
Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone. This model was duplicated to epoxy resin die. On the resin die, 15 three-unit FPDs were fabricated per group (45 in total): Group A, zirconia 3-unit FPDs made with the Everest system; Group B, zirconia 3-unit FPDs made with the Lava system; and Group C, metal-ceramic 3-unit FPDs. They were cemented to resin dies with resin cement. After removal of pontic, each retainer was separated and observed under a microscope (Presize 440C). Marginal gaps of experimental groups were analyzed using one-way ANOVA and Duncan test.
RESULTS
Mean marginal gaps of 3-unit FPDs were 60.46 microm for the Everest group, 78.71 microm for the Lava group, and 81.32 microm for the metal-ceramic group. The Everest group demonstrated significantly smaller marginal gap than the Lava and the metal-ceramic groups (P<.05). The marginal gap did not significantly differ between the Lava and the metal-ceramic groups (P>.05).
CONCLUSION
The marginal gaps of anterior 3-unit zirconia FPD differed according to CAD/CAM systems, but still fell within clinically acceptable ranges compared with conventional metal-ceramic restoration.

Keyword

Marginal fit; CAD/CAM; Zirconia FPD

MeSH Terms

Denture, Partial, Fixed
Incisor
Resin Cements
Zirconium
Resin Cements
Zirconium

Figure

  • Fig. 1 (A) Prepared resin teeth, (B) Epoxy resin die for final restoration, (C) Metal coping jig, (D) Three-unit zirconia anterior fixed partial denture fabricated using the Everest system, (E) Three-unit zirconia anterior fixed partial denture fabricated using the Lava system, (F) Three-unit metal-ceramic FPD.

  • Fig. 2 Non-contact measuring machine (Presize 440C).

  • Fig. 3 Photographs of labial surface marginal gap using Presize 440C (×145 magnification). (A) Everest system, (B) Lava system, (C) Metal-ceramic (The luting cement showed black color because of the shadow of the metal framework).

  • Fig. 4 Boxplot of marginal gaps for the 3 experimental groups. The Everest group demonstrated significantly smaller values than the Lava and metal-ceramic groups. The small circles and stars stand for the mild and severe outliers, respectively.


Cited by  1 articles

Comparative evaluation of marginal and internal fit of metal copings fabricated by various CAD/CAM methods
Seung-Jin Jeong, Hye-Won Cho, Ji-Hye Jung, Jeong-Mi Kim, Yu-Lee Kim
J Korean Acad Prosthodont. 2019;57(3):211-218.    doi: 10.4047/jkap.2019.57.3.211.


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