Limits...
The minimum thickness of a multilayer porcelain restoration required for masking severe tooth discoloration.

Shadman N, Kandi SG, Ebrahimi SF, Shoul MA - Dent Res J (Isfahan) (2015 Nov-Dec)

Bottom Line: One-way ANOVA and post-hoc tests of specimen average one-to-one comparison (Tukey HSD) were conducted and P ≤ 0.05 was set as the level of significance.A trend was shown in the results as by increasing the thickness, ΔE*ab is was decreased.The mean ΔE*1*a*b between different thicknesses were statistically significant (P < 0.05) only between group 4 with groups 1 and 2, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Operative Dentistry, Faculty of Dentistry, Oral and Dental Diseases Research Center, Kerman University of Medical Sciences, Kerman, Iran.

ABSTRACT

Background: Although studies have shown that porcelain veneers are very efficient for treating discolored teeth, they did not address in particular the minimum thickness of a multilayer IPS e.max Press (IvoclarVivadent, Schaan, Liechtenstein) restoration required to mask discolored tooth. The aim of this study was to determine the minimum thickness of a multilayer porcelain restoration required for masking severe tooth discoloration.

Materials and methods: A total of 24 disk-shaped multilayer specimens were prepared from IPS e.max Press with the diameter of 13 mm and four different thicknesses (core/veneer: 0.4/0.4 mm, 0.5/0.5 mm, 0.6/0.6 mm and 0.8/0.7 mm). Two backgrounds, C4-shade body porcelain and an opaque background from the selected IPS e.max ceramic itself were fabricated to mimic a discolored or stained natural tooth structure and to determine the masking ability. After applying the resin cement layer (Panavia F2.0) with 0.01 mm thickness on each background, all specimens were measured on both background using a spectrophotometer and values of L*, a* and b* were calculated to determine the color differences (ΔE*ab). One-way ANOVA and post-hoc tests of specimen average one-to-one comparison (Tukey HSD) were conducted and P ≤ 0.05 was set as the level of significance.

Results: ΔE*ab of all groups were within the range of the clinically acceptable color difference (ΔE≤3.3), thus all the groups could mask the C4 background even group 1 with only 0.8 mm thickness. A trend was shown in the results as by increasing the thickness, ΔE*ab is was decreased. The mean ΔE*1*a*b between different thicknesses were statistically significant (P < 0.05) only between group 4 with groups 1 and 2, respectively.

Conclusion: Within the limitations of this study, all studied thicknesses could mask the C4 background. However, the minimum thickness of a multilayer porcelain restoration (IPS e.max Press) required for masking severe tooth discoloration was 0.8 mm.

No MeSH data available.


Related in: MedlinePlus

Schematic figure for the method to prepare constant cement layer thickness.
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Figure 1: Schematic figure for the method to prepare constant cement layer thickness.

Mentions: For applying the cement layer on each background, a disc with 13 mm in diameter was obtained from a plastic sheet which had 0.1 mm thickness, placed on the background and silicone mold was prepared. Four gaps were made in the silicon mold for the cement excess. Inside the space, cement was placed. First, a plastic sheet and the glass slab were put on the uncured resin cement and pressed with finger and cured by Quartz-Tungsten-Halogen light curing device for 40 s (Optilux 501, Demetron Kerr, Orange, CA, USA)[11] [Figure 1].


The minimum thickness of a multilayer porcelain restoration required for masking severe tooth discoloration.

Shadman N, Kandi SG, Ebrahimi SF, Shoul MA - Dent Res J (Isfahan) (2015 Nov-Dec)

Schematic figure for the method to prepare constant cement layer thickness.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4696359&req=5

Figure 1: Schematic figure for the method to prepare constant cement layer thickness.
Mentions: For applying the cement layer on each background, a disc with 13 mm in diameter was obtained from a plastic sheet which had 0.1 mm thickness, placed on the background and silicone mold was prepared. Four gaps were made in the silicon mold for the cement excess. Inside the space, cement was placed. First, a plastic sheet and the glass slab were put on the uncured resin cement and pressed with finger and cured by Quartz-Tungsten-Halogen light curing device for 40 s (Optilux 501, Demetron Kerr, Orange, CA, USA)[11] [Figure 1].

Bottom Line: One-way ANOVA and post-hoc tests of specimen average one-to-one comparison (Tukey HSD) were conducted and P ≤ 0.05 was set as the level of significance.A trend was shown in the results as by increasing the thickness, ΔE*ab is was decreased.The mean ΔE*1*a*b between different thicknesses were statistically significant (P < 0.05) only between group 4 with groups 1 and 2, respectively.

View Article: PubMed Central - PubMed

Affiliation: Department of Operative Dentistry, Faculty of Dentistry, Oral and Dental Diseases Research Center, Kerman University of Medical Sciences, Kerman, Iran.

ABSTRACT

Background: Although studies have shown that porcelain veneers are very efficient for treating discolored teeth, they did not address in particular the minimum thickness of a multilayer IPS e.max Press (IvoclarVivadent, Schaan, Liechtenstein) restoration required to mask discolored tooth. The aim of this study was to determine the minimum thickness of a multilayer porcelain restoration required for masking severe tooth discoloration.

Materials and methods: A total of 24 disk-shaped multilayer specimens were prepared from IPS e.max Press with the diameter of 13 mm and four different thicknesses (core/veneer: 0.4/0.4 mm, 0.5/0.5 mm, 0.6/0.6 mm and 0.8/0.7 mm). Two backgrounds, C4-shade body porcelain and an opaque background from the selected IPS e.max ceramic itself were fabricated to mimic a discolored or stained natural tooth structure and to determine the masking ability. After applying the resin cement layer (Panavia F2.0) with 0.01 mm thickness on each background, all specimens were measured on both background using a spectrophotometer and values of L*, a* and b* were calculated to determine the color differences (ΔE*ab). One-way ANOVA and post-hoc tests of specimen average one-to-one comparison (Tukey HSD) were conducted and P ≤ 0.05 was set as the level of significance.

Results: ΔE*ab of all groups were within the range of the clinically acceptable color difference (ΔE≤3.3), thus all the groups could mask the C4 background even group 1 with only 0.8 mm thickness. A trend was shown in the results as by increasing the thickness, ΔE*ab is was decreased. The mean ΔE*1*a*b between different thicknesses were statistically significant (P < 0.05) only between group 4 with groups 1 and 2, respectively.

Conclusion: Within the limitations of this study, all studied thicknesses could mask the C4 background. However, the minimum thickness of a multilayer porcelain restoration (IPS e.max Press) required for masking severe tooth discoloration was 0.8 mm.

No MeSH data available.


Related in: MedlinePlus