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Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns.

Pak HS, Han JS, Lee JB, Kim SH, Yang JH - J Adv Prosthodont (2010)

Bottom Line: Marginal fit is a very important factor considering the restoration's long-term success.Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group.However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.

ABSTRACT

Purpose: Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelain veneering. This study was also intended to verify the marginal fit of crowns originated from green machining of partially sintered blocks of zirconia (Lava CAD/CAM system) and that of crowns obtained through machining of fully sintered blocks of zirconia (Digident CAD/CAM system).

Materials and methods: 20 crowns were made per each system and the marginal fit was evaluated through a light microscope with image processing (Accura 2000) at 50 points that were randomly selected. Each crown was measured twice: the first measurement was done after obtaining a 0.5 mm coping and the second measurement was done after porcelain veneering. The means and standard deviations were calculated and statistical inferences among the 2 groups were made using independent t-test and within the same group through paired t-test.

Results: The means and standard deviations of the marginal fit were 61.52 ± 2.88 µm for the Digident CAD/CAM zirconia ceramic crowns before porcelain veneering and 83.15 ± 3.51 µm after porcelain veneering. Lava CAD/CAM zirconia ceramic crowns showed means and standard deviations of 62.22 ± 1.78 µm before porcelain veneering and 82.03 ± 1.85 µm after porcelain veneering. Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group. However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well.

Conclusion: The 2 all-ceramic crown systems showed marginal gaps that were within a reported clinically acceptable range of marginal discrepancy.

No MeSH data available.


Related in: MedlinePlus

A: Digident CAD/CAM zirconia ceramic crown, B: Lava CAD/CAM zirconia ceramic crown.
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Figure 3: A: Digident CAD/CAM zirconia ceramic crown, B: Lava CAD/CAM zirconia ceramic crown.

Mentions: Following the first measurement, specific porcelain of the Lava CAD/CAM system (Lava Ceram; 3M ESPE Dental Products, Seefeld, Germany) and Digident CAD/CAM system (Creation CP ZI; Creation Willi Geller International AG, Baar, Switzerland) were veneered on the correspondent coping by one experienced dental technician who was accustomed to both systems. These crowns underwent 3 firing cycles which was considered a typical number for a clinical case. After the veneering process, the second measurement of the marginal fit was achieved (Fig. 3).


Influence of porcelain veneering on the marginal fit of Digident and Lava CAD/CAM zirconia ceramic crowns.

Pak HS, Han JS, Lee JB, Kim SH, Yang JH - J Adv Prosthodont (2010)

A: Digident CAD/CAM zirconia ceramic crown, B: Lava CAD/CAM zirconia ceramic crown.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2984519&req=5

Figure 3: A: Digident CAD/CAM zirconia ceramic crown, B: Lava CAD/CAM zirconia ceramic crown.
Mentions: Following the first measurement, specific porcelain of the Lava CAD/CAM system (Lava Ceram; 3M ESPE Dental Products, Seefeld, Germany) and Digident CAD/CAM system (Creation CP ZI; Creation Willi Geller International AG, Baar, Switzerland) were veneered on the correspondent coping by one experienced dental technician who was accustomed to both systems. These crowns underwent 3 firing cycles which was considered a typical number for a clinical case. After the veneering process, the second measurement of the marginal fit was achieved (Fig. 3).

Bottom Line: Marginal fit is a very important factor considering the restoration's long-term success.Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group.However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.

ABSTRACT

Purpose: Marginal fit is a very important factor considering the restoration's long-term success. However, adding porcelain to copings can cause distortion and lead to an inadequate fit which exposes more luting material to the oral environment and causes secondary caries. The purpose of this study was to compare the marginal fit of 2 different all-ceramic crown systems before and after porcelain veneering. This study was also intended to verify the marginal fit of crowns originated from green machining of partially sintered blocks of zirconia (Lava CAD/CAM system) and that of crowns obtained through machining of fully sintered blocks of zirconia (Digident CAD/CAM system).

Materials and methods: 20 crowns were made per each system and the marginal fit was evaluated through a light microscope with image processing (Accura 2000) at 50 points that were randomly selected. Each crown was measured twice: the first measurement was done after obtaining a 0.5 mm coping and the second measurement was done after porcelain veneering. The means and standard deviations were calculated and statistical inferences among the 2 groups were made using independent t-test and within the same group through paired t-test.

Results: The means and standard deviations of the marginal fit were 61.52 ± 2.88 µm for the Digident CAD/CAM zirconia ceramic crowns before porcelain veneering and 83.15 ± 3.51 µm after porcelain veneering. Lava CAD/CAM zirconia ceramic crowns showed means and standard deviations of 62.22 ± 1.78 µm before porcelain veneering and 82.03 ± 1.85 µm after porcelain veneering. Both groups showed significant differences when analyzing the marginal gaps before and after porcelain veneering within each group. However, no significant differences were found when comparing the marginal gaps of each group before porcelain veneering and after porcelain veneering as well.

Conclusion: The 2 all-ceramic crown systems showed marginal gaps that were within a reported clinically acceptable range of marginal discrepancy.

No MeSH data available.


Related in: MedlinePlus