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Effect of abutment shade, ceramic thickness, and coping type on the final shade of zirconia all-ceramic restorations: in vitro study of color masking ability.

Oh SH, Kim SG - J Adv Prosthodont (2015)

Bottom Line: The average L*, a*, b* values of the zirconia specimens on the six abutment specimens were measured with a dental colorimeter, and the statistical significance in the effects of three variables was analyzed by using repeated measures analysis of variance (α=.05).The average shade difference (ΔE) values of the zirconia specimens between the A2 composite resin abutment and other abutments were also evaluated.The effects of zirconia specimen thickness (P<.001), abutment shade (P<.001), and type of zirconia copings (P<.003) on the final shade of the zirconia restorations were significant.The average ΔE value of Lava specimens (1 mm) between the A2 composite resin and gold alloy abutments was higher (close to the acceptability threshold of 5.5 ΔE) than th ose between the A2 composite resin and other abutments.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Republic of Korea.

ABSTRACT

Purpose: The aim of the study was to evaluate the effect of abutment shade, ceramic thickness, and coping type on the final shade of zirconia all-ceramic restorations.

Materials and methods: Three different types of disk-shaped zirconia coping specimens (Lava, Cercon, Zirkonzahn: ø10 mm × 0.4 mm) were fabricated and veneered with IPS e.max Press Ceram (shade A2), for total thicknesses of 1 and 1.5 mm. A total of sixty zirconia restoration specimens were divided into six groups based on their coping types and thicknesses. The abutment specimens (ø10 mm × 7 mm) were prepared with gold alloy, base metal (nickel-chromium) alloy, and four different shades (A1, A2, A3, A4) of composite resins. The average L*, a*, b* values of the zirconia specimens on the six abutment specimens were measured with a dental colorimeter, and the statistical significance in the effects of three variables was analyzed by using repeated measures analysis of variance (α=.05).The average shade difference (ΔE) values of the zirconia specimens between the A2 composite resin abutment and other abutments were also evaluated.

Results: The effects of zirconia specimen thickness (P<.001), abutment shade (P<.001), and type of zirconia copings (P<.003) on the final shade of the zirconia restorations were significant. The average ΔE value of Lava specimens (1 mm) between the A2 composite resin and gold alloy abutments was higher (close to the acceptability threshold of 5.5 ΔE) than th ose between the A2 composite resin and other abutments.

Conclusion: This in-vitro study demonstrated that abutment shade, ceramic thickness, and coping type affected the resulting shade of zirconia restorations.

No MeSH data available.


Related in: MedlinePlus

Mean L*a*b* values of Lava (L) zirconia specimens on different shades of abutment specimens. (A) Mean L* values, (B) Mean a* values, (C) Mean b* values.Abbreviations; L1: Lava 1 mm, L1.5: Lava1.5 mm, BM: base metal alloy, G: gold alloy, A1-A4: A1-A4 shades of composite resin, L*: lightness, a*: redness(+).greenness(-), b*: yellowness(+)/blueness(-).
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Figure 1: Mean L*a*b* values of Lava (L) zirconia specimens on different shades of abutment specimens. (A) Mean L* values, (B) Mean a* values, (C) Mean b* values.Abbreviations; L1: Lava 1 mm, L1.5: Lava1.5 mm, BM: base metal alloy, G: gold alloy, A1-A4: A1-A4 shades of composite resin, L*: lightness, a*: redness(+).greenness(-), b*: yellowness(+)/blueness(-).

Mentions: The average L*, a*, b* values of the zirconia specimens on the abutments are shown in Fig. 1, Fig. 2, and Fig. 3. When the ceramic thickness increased from 1 to 1.5 mm, the L* value decreased, and the a* and b* values increased. The gold abutment (G) showed the highest L*, a*, b* values, and the base metal abutment (BM) had the lowest L*, b* values. The average L*, a*, b* values of three types of the zirconia specimens with 1 and 1.5 mm thicknesses are compared in Fig. 4. The a* and b* values showed little difference among the zirconia specimens, but the lowest L* value was observed in the Lava specimens. According to the results from the repeated measures analysis of variance, there were significant effects of the ceramic thicknesses (P < .001), abutment shades (P < .001), and types of zirconia coping (P < .003) on the final shade of the zirconia restorations.


Effect of abutment shade, ceramic thickness, and coping type on the final shade of zirconia all-ceramic restorations: in vitro study of color masking ability.

Oh SH, Kim SG - J Adv Prosthodont (2015)

Mean L*a*b* values of Lava (L) zirconia specimens on different shades of abutment specimens. (A) Mean L* values, (B) Mean a* values, (C) Mean b* values.Abbreviations; L1: Lava 1 mm, L1.5: Lava1.5 mm, BM: base metal alloy, G: gold alloy, A1-A4: A1-A4 shades of composite resin, L*: lightness, a*: redness(+).greenness(-), b*: yellowness(+)/blueness(-).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644777&req=5

Figure 1: Mean L*a*b* values of Lava (L) zirconia specimens on different shades of abutment specimens. (A) Mean L* values, (B) Mean a* values, (C) Mean b* values.Abbreviations; L1: Lava 1 mm, L1.5: Lava1.5 mm, BM: base metal alloy, G: gold alloy, A1-A4: A1-A4 shades of composite resin, L*: lightness, a*: redness(+).greenness(-), b*: yellowness(+)/blueness(-).
Mentions: The average L*, a*, b* values of the zirconia specimens on the abutments are shown in Fig. 1, Fig. 2, and Fig. 3. When the ceramic thickness increased from 1 to 1.5 mm, the L* value decreased, and the a* and b* values increased. The gold abutment (G) showed the highest L*, a*, b* values, and the base metal abutment (BM) had the lowest L*, b* values. The average L*, a*, b* values of three types of the zirconia specimens with 1 and 1.5 mm thicknesses are compared in Fig. 4. The a* and b* values showed little difference among the zirconia specimens, but the lowest L* value was observed in the Lava specimens. According to the results from the repeated measures analysis of variance, there were significant effects of the ceramic thicknesses (P < .001), abutment shades (P < .001), and types of zirconia coping (P < .003) on the final shade of the zirconia restorations.

Bottom Line: The average L*, a*, b* values of the zirconia specimens on the six abutment specimens were measured with a dental colorimeter, and the statistical significance in the effects of three variables was analyzed by using repeated measures analysis of variance (α=.05).The average shade difference (ΔE) values of the zirconia specimens between the A2 composite resin abutment and other abutments were also evaluated.The effects of zirconia specimen thickness (P<.001), abutment shade (P<.001), and type of zirconia copings (P<.003) on the final shade of the zirconia restorations were significant.The average ΔE value of Lava specimens (1 mm) between the A2 composite resin and gold alloy abutments was higher (close to the acceptability threshold of 5.5 ΔE) than th ose between the A2 composite resin and other abutments.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Republic of Korea.

ABSTRACT

Purpose: The aim of the study was to evaluate the effect of abutment shade, ceramic thickness, and coping type on the final shade of zirconia all-ceramic restorations.

Materials and methods: Three different types of disk-shaped zirconia coping specimens (Lava, Cercon, Zirkonzahn: ø10 mm × 0.4 mm) were fabricated and veneered with IPS e.max Press Ceram (shade A2), for total thicknesses of 1 and 1.5 mm. A total of sixty zirconia restoration specimens were divided into six groups based on their coping types and thicknesses. The abutment specimens (ø10 mm × 7 mm) were prepared with gold alloy, base metal (nickel-chromium) alloy, and four different shades (A1, A2, A3, A4) of composite resins. The average L*, a*, b* values of the zirconia specimens on the six abutment specimens were measured with a dental colorimeter, and the statistical significance in the effects of three variables was analyzed by using repeated measures analysis of variance (α=.05).The average shade difference (ΔE) values of the zirconia specimens between the A2 composite resin abutment and other abutments were also evaluated.

Results: The effects of zirconia specimen thickness (P<.001), abutment shade (P<.001), and type of zirconia copings (P<.003) on the final shade of the zirconia restorations were significant. The average ΔE value of Lava specimens (1 mm) between the A2 composite resin and gold alloy abutments was higher (close to the acceptability threshold of 5.5 ΔE) than th ose between the A2 composite resin and other abutments.

Conclusion: This in-vitro study demonstrated that abutment shade, ceramic thickness, and coping type affected the resulting shade of zirconia restorations.

No MeSH data available.


Related in: MedlinePlus