Data di Pubblicazione:
2012
Abstract:
Objectives :
the aim of this study is to analyze the variation of the color according to the thickness of dental tissues in order to provide a guide for layering the composite in accordance with the preparation depth.
Methods :
24 upper central incisors were collected according to the requirements for the study: no conservative/prosthetic restorations or endo-canal treatments. The teeth were cleaned and stored in saline solution.
The dental tissues were removed in “dry” condition with ultrasonic air-scaler (SONICflex- amplitude 240μ, frequency 6500Hz) and specific burs that guarantee a preparation parallel to the working plane.
The element was prepared starting from the top layer to the pulp; for each preparation 100μ in thickness was removed (T).
The surface was polished through a standardized system with high-gloss polishers both passed on the tooth surface for 6 seconds. Using a digital micrometer it was calculated the tooth dental thickness removed.
In each preparation the colour difference were spectrophotometrically assessed (SpectroShade™): (DE94) and ΔL*(Lightness), ΔC*(Chroma) and Δh*(hue) from the color space CIELCh.
A customized support is realized in order to standardize the measurements (black background, element centered and perpendicular to the axis of measurement).
Results :
L
C
μDE94
Central portion
T0 L=81.7
T0 C=20.9
5.50(1.210.4)
DT1=1365μ L=88.1
DT1=274μ C=22.6
DT2 =2345μ (pulp-chamber) L=78.1
DT2 =2345μ (pulp-chamber) C=9.7
CEJ
T0 L=83.2
T0 C=19.9
5.14
(19.4)
DT1=1317μ L=89.8
DT1=388μ C=21.5
DT2 =2511μ (pulp-canal) L=84.5
DT2 =2133μ C=12.3
(table 1)
We observed that ΔL* and ΔC* are proportional to the thickness removed.
In every tooth area we observed a different result and the black-background influence the measurement.
Conclusions :
The great influence between dental thicknees and dental color carateristics indicate as possible to create a mathematical model that correlates ΔL* and ΔC* to a dental element and resin composite.
the aim of this study is to analyze the variation of the color according to the thickness of dental tissues in order to provide a guide for layering the composite in accordance with the preparation depth.
Methods :
24 upper central incisors were collected according to the requirements for the study: no conservative/prosthetic restorations or endo-canal treatments. The teeth were cleaned and stored in saline solution.
The dental tissues were removed in “dry” condition with ultrasonic air-scaler (SONICflex- amplitude 240μ, frequency 6500Hz) and specific burs that guarantee a preparation parallel to the working plane.
The element was prepared starting from the top layer to the pulp; for each preparation 100μ in thickness was removed (T).
The surface was polished through a standardized system with high-gloss polishers both passed on the tooth surface for 6 seconds. Using a digital micrometer it was calculated the tooth dental thickness removed.
In each preparation the colour difference were spectrophotometrically assessed (SpectroShade™): (DE94) and ΔL*(Lightness), ΔC*(Chroma) and Δh*(hue) from the color space CIELCh.
A customized support is realized in order to standardize the measurements (black background, element centered and perpendicular to the axis of measurement).
Results :
L
C
μDE94
Central portion
T0 L=81.7
T0 C=20.9
5.50(1.2
DT1=1365μ L=88.1
DT1=274μ C=22.6
DT2 =2345μ (pulp-chamber) L=78.1
DT2 =2345μ (pulp-chamber) C=9.7
CEJ
T0 L=83.2
T0 C=19.9
5.14
(1
DT1=1317μ L=89.8
DT1=388μ C=21.5
DT2 =2511μ (pulp-canal) L=84.5
DT2 =2133μ C=12.3
(table 1)
We observed that ΔL* and ΔC* are proportional to the thickness removed.
In every tooth area we observed a different result and the black-background influence the measurement.
Conclusions :
The great influence between dental thicknees and dental color carateristics indicate as possible to create a mathematical model that correlates ΔL* and ΔC* to a dental element and resin composite.
Tipologia CRIS:
4.2 Abstract in Atti di convegno
Elenco autori:
S., Brazzoli; KOVACS VAJNA, Zsolt Miklos; Acquaviva, Pier Antonio; Barabanti, Nicola; Cerutti, Antonio
Link alla scheda completa:
Titolo del libro:
Atti del PER/IADR Congress
Pubblicato in: