Int J Stomatol

Int J Stomatol ›› 2020, Vol. 47 ›› Issue (4): 418-423.doi: 10.7518/gjkq.2020059

• Original Articles • Previous Articles     Next Articles

Effect of opaque-shade resin layer thickness on the color of polyetheretherketone-Crea.lign restoration

Zhang Jingting1,Pan Xudong1,Zhang Wenyun2()   

  1. 1. Dept. of Stomatology, Kunming Municipal Hospital of Traditional Chinese Medicine, Kunming 650500, China
    2. Dept. of Stomatology, 920th Hospital of Joint Logistics Support Force, Kunming 650200, China
  • Received:2019-09-15 Revised:2020-03-16 Online:2020-07-01 Published:2020-07-10
  • Contact: Wenyun Zhang E-mail:wenyunzh88@126.com

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Abstract:

Objective This study aimed to test the effect of different thicknesses of opaque-shade resin layer on the color of detin-shade polyetheretherketone (PEEK)-Crea.lign restoration. Methods PEEK of 0.6 mm thickness was synthesized, and A2 shade Crea.lign of opaque-shade resin layers of 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5 mm and body-shade resin layer of 1.0 mm were bonded on the surface of PEEK. CIE (International Commission on illumination) L*a*b* values for specimens were measured, and color difference among the different thickness groups was calculated. Results For the 0.0 mm body-shade resin layer + 0.1-0.3 mm opaque-shade resin layer and 1.0 mm body-shade resin layer + 0.0-0.2 mm opaque-shade resin layer, the color values showed an upward trend with the increasing thickness of the opaque-shade resin layer. When the thicknesses of PEEK and body-shade resin layer were constant at 0.0 and/or 1.0 mm respectively, the color differences between each group of 0.1-0.5 mm-thick opaque-shade resin layer were within the clinical acceptable range. Beyond clinically acceptable color difference was observed for the detin-shade PEEK. Conclusion In clinical setting, the 0.1-0.5 mm thickness range of opaque-shade resin layers did not influence the color of the detin-shade PEEK-Crea.lign restoration. In addition, 0.1 mm was the minimum thickness that sufficiently covered the detin-shade PEEK background.

Key words: polyetheretherketone, Crea.lign resin, thickness, color

CLC Number: 

  • R783.1

TrendMD: 

Fig 1

Circular hole shaped stainless steel mould"

Fig 2

Homemade cassette"

Fig 3

The specimen is fixed on the cassette"

Tab 1

Color values of different opaque-shade resin layers (without body-shade resin layer) n=5,$\hat{x}±s$"

分组 L* a* b*
PEEK 81.900±0.322a 0.533±0.082c 22.658±0.134a
O-1 80.909±0.598ab 1.283±0.167b 21.167±0.281b
O-2 81.642±0.279a 1.475±0.206ab 21.300±0.363b
O-3 81.809±0.518a 1.525±0.096ab 21.483±0.111b
O-4 81.642±0.478a 1.658±0.069a 21.550±0.301b
O-5 80.517±0.477b 1.792±0.181a 22.133±0.127b

Tab 2

Color values of 1.0 mm body-shade resin layers with different opaque-shade resin layers n=5,$\hat{x}±s$"

分组 L* a* b*
无遮色层 71.573±0.228c 3.100±0.197c 23.920±0.403b
OB-1 73.473±0.205ab 4.187±0.228b 26.153±0.051a
OB-2 73.740±0.125a 4.226±0.072ab 26.540±0.123a
OB-3 73.542±0.126ab 4.258±0.100ab 26.592±0.261a
OB-4 73.407±0.064b 4.367±0.078ab 26.567±0.227a
OB-5 73.373±0.128b 4.493±0.104a 26.313±0.186a

Tab 3

Color difference between the thickness of each opaque-shade resin layers (without body-shade resin layer) NBS"

分组 PEEK O-1 O-2 O-3 O-4
O-1 2.002±0.366 - - - -
O-2 1.776±0.183 1.130±0.371 - - -
O-3 1.596±0.185 1.188±0.774 0.535±0.231 - -
O-4 1.715±0.366 0.992±0.632 0.712±0.229 0.776±0.278 -
O-5 2.294±0.442 0.870±0.398 1.266±0.572 1.349±0.927 1.274±0.642

Tab 4

Color difference between the thickness of each opaque-shade resin layers (the thickness 1.0 mm of the body-shade esin layers) NBS"

分组 无遮色层 OB-1 OB-2 OB-3 OB-4 OB-5
OB-1 3.135±0.560 - - - - -
OB-2 3.588±0.508 0.558±0.058 - - - -
OB-3 3.502±0.636 0.510±0.302 0.313±0.094 - - -
OB-4 3.466±0.543 0.534±0.296 0.435±0.149 0.419±0.107 - -
OB-5 3.314±0.614 0.464±0.227 0.540±0.128 0.471±0.196 0.400±0.139 -
PEEK 10.731±0.457 9.837±0.412 9.737±0.291 9.968±0.344 10.154±0.236 10.052±0.261
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