J Korean Acad Prosthodont.  2010 Apr;48(2):135-142.

Evaluation using Replica Technique on the marginal and internal fitness of zirconia cores by several CAD/CAM systems

• Huh JB
• Park CG
• Kim HY
• Park CK
• Shin SW

Abstract

PURPOSE
This study was aimed to compare the margin and internal fitness of single anterior all-ceramic crown zirconia core made by three deferent CAD/CAM systems. MATERIAL AND METHODS: Five single zirconia cores were manufactured by three deferent CAD/CAM systems(Cerasys(R)system, KaVo Everest(R)system, Lava(TM) system). The manufactured zirconia cores were duplicated through the use of replica technique, and a replicated sample was sectioned in the center of bucolingual and mesiodistal direction to measure the marginal and internal gap. Measurement was carried out by using measuring microscope (AXIO(R)) and I-Solution(R) and analysed through the use of ANOVA.
RESULTS
As for the mean marginal fitness of the zirconia core, it was 84.74 +/- 27.57 micrometer, in Cerasys(R), 80.23 +/- 21.07 micrometer in KaVo Everest(R) and 96.37 +/- 11.45 micrometer in Lava(TM), and as for the mean internal gap, it was 94.11 +/- 30.07 micrometer in Cerasys(R), 92.31 +/- 25.18 micrometer in KaVo Everest(R), and 94.99 +/- 18.74 micrometer in Lava(TM). There was no significant statistically deference among the total average gap of three systems. The internal gap in KaVo Everest(R) seemed to be smaller than Lava(TM) (P < .05). The internal gap in the incisal area was larger in all of the three systems.
CONCLUSION
There was no difference in marginal fitness in Cerasys(R), KaVo Everest(R) and Lava(TM). As for the internal fitness, it was smaller in KaVo Everest(R) system than Lava(TM)system. In all of the three systems, there was a larger gap in incisal area. The marginal and internal gap was within the clinically allowed range in all of the three systems.

Keyword

CAD/CAM; Zirconia core; Marginal fitness; Internal fitness

MeSH Terms

Crowns
Replica Techniques
Zirconium
Zirconium

Figure

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  Fig. 1. Master models with Titanium Block made by using CAD/CAM system (Addtech Co., Seoul, Korea).

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  Fig. 2. Directions and positions of sectioning the replica materials.

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  Fig. 3. Surface aspect after sectioning with buccolingual direction.

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  Fig. 4. Reference points to measure the thickness.

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