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Color Consistency of Zirconium Oxide CEREC Crowns Milled at Different Thicknesses.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Color Consistency of Zirconium Oxide CEREC Crowns Milled at Different Thicknesses./
作者:	Alali, Talal.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	41 p.
附註:	Source: Masters Abstracts International, Volume: 82-09.
Contained By:	Masters Abstracts International82-09.
標題:	Dentistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28390729
ISBN:	9798569959785

Color Consistency of Zirconium Oxide CEREC Crowns Milled at Different Thicknesses.
Alali, Talal.

Color Consistency of Zirconium Oxide CEREC Crowns Milled at Different Thicknesses. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 41 p.

Source: Masters Abstracts International, Volume: 82-09.

Thesis (M.D.S.)--University of Pittsburgh, 2021.

This item must not be sold to any third party vendors.

Purpose: The purpose of this study was to evaluate the color of full-contour zirconia CEREC restorations milled at different material thicknesses which could aid dental practitioners in planning full-contour ceramic restorations. Method and materials: Two sample crown preparations were made of an individual biogeneric copy of a left maxillary central incisor on a model scanned by means of Sirona CEREC Omnicam. One sample was prepared at a reduction of 1 mm, while the other was prepared at a 2mm reduction. A total of 60 CEREC Ivoclar ZirCad LT blocks were used to create 10 Samples of monochromic Zirconia crowns milled at 1 mm and 2 mm thicknesses in each of Vita classic shades A1, B2, and C2. The optimal thickness of 1 mm was chosen for the control groups Based on manufacturer recommendations and optimal thickness of 2 mm was chosen for the test groups. Sample crowns were sintered by means of a Sirona SpeedFire oven. No additive coloring or glaze was applied. A Canon 80D digital camera equipped with a Canon MR-14EXII ring flash and a polarized filter was used to photograph all test and control group specimens. The photographs were developed via digital software, Photoshop CC 2019. The CIE L*a*b* color values were measured. Results: CIE L*a*b* data for all samples was recorded and statistically analyzed using a two sample t-test, STATA.SE v16. There was a statistically significant difference (P < 0.05) in L* values when test groups (2mm) were compared with the control groups (1mm) for shades A1, B2, and C2 with P < 0.00. ΔE for shades A1, B2 and C2 groups were 3.64, 3.67, and 4.55 respectively which is higher than the clinically acceptable threshold 3.3. Conclusion: An increase in the thickness of Zirconia from 1mm to 2mm demonstrated a ΔE > 3.3 in all test groups which is detectable by untrained observers. As the thickness if Zirconia increased from 1mm to 2 mm, L* decreased in all test groups. Vita Classic shade C-2 demonstrated a more dramatic decrease in L* than shade A-1 and B-2 following the Zirconia thickness change from 1mm to 2mm.

ISBN: 9798569959785Subjects--Topical Terms:

828971
Dentistry.
Subjects--Index Terms:

Color consistency

Color Consistency of Zirconium Oxide CEREC Crowns Milled at Different Thicknesses.
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500 $a Source: Masters Abstracts International, Volume: 82-09.
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520 $a Purpose: The purpose of this study was to evaluate the color of full-contour zirconia CEREC restorations milled at different material thicknesses which could aid dental practitioners in planning full-contour ceramic restorations. Method and materials: Two sample crown preparations were made of an individual biogeneric copy of a left maxillary central incisor on a model scanned by means of Sirona CEREC Omnicam. One sample was prepared at a reduction of 1 mm, while the other was prepared at a 2mm reduction. A total of 60 CEREC Ivoclar ZirCad LT blocks were used to create 10 Samples of monochromic Zirconia crowns milled at 1 mm and 2 mm thicknesses in each of Vita classic shades A1, B2, and C2. The optimal thickness of 1 mm was chosen for the control groups Based on manufacturer recommendations and optimal thickness of 2 mm was chosen for the test groups. Sample crowns were sintered by means of a Sirona SpeedFire oven. No additive coloring or glaze was applied. A Canon 80D digital camera equipped with a Canon MR-14EXII ring flash and a polarized filter was used to photograph all test and control group specimens. The photographs were developed via digital software, Photoshop CC 2019. The CIE L*a*b* color values were measured. Results: CIE L*a*b* data for all samples was recorded and statistically analyzed using a two sample t-test, STATA.SE v16. There was a statistically significant difference (P < 0.05) in L* values when test groups (2mm) were compared with the control groups (1mm) for shades A1, B2, and C2 with P < 0.00. ΔE for shades A1, B2 and C2 groups were 3.64, 3.67, and 4.55 respectively which is higher than the clinically acceptable threshold 3.3. Conclusion: An increase in the thickness of Zirconia from 1mm to 2mm demonstrated a ΔE > 3.3 in all test groups which is detectable by untrained observers. As the thickness if Zirconia increased from 1mm to 2 mm, L* decreased in all test groups. Vita Classic shade C-2 demonstrated a more dramatic decrease in L* than shade A-1 and B-2 following the Zirconia thickness change from 1mm to 2mm.
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