[Evaluation of colour differences in fiber post all-ceramic prosthetic restoration by spectrophotometry].
OBJECTIVE
The aim of this study was to evaluate the influence of fiber post on all-ceramic prosthetic restorations, using the spectrophotometer Miniscan XE. Data were recorded according to the CIEL*a*b* system and the color difference (DE) was calculated.


METHODS
Carbon fiber Composipost (RTD) and quartz fiber Lightpost (RTD) posts were used. Square specimens (12x12 mm) were prepared using 9 #1 posts, covered with Z100 (3M) composite layers of different thickness (2, 3 and 4 mm) and color A3; 12x12 mm ceramic specimens (Finesse All Ceramic - 3M) of 2 and 3 mm thickness and color A3, were prepared using both opaque dentin and not.


RESULTS
With 2 and 3 mm thick ceramic layers, there was no color difference between carbon fiber specimens and quartz fiber specimens. Using the opaque dentin did not determine difference between groups.


CONCLUSIONS
In this study, according to results, a 3 mm thick ceramic layer always produced a DE<1, independently from the endodontic post. However, 2 mm thick ceramic layers were able to cover every kind of endodontic posts, even if with a DE=+/-1.6, and therefore are clinically acceptable.
Bevilacqua
L
L
Dipartimento di Scienze, Chirurgiche Specialistiche, Università degli Studi di Trieste, Trieste, Italy. l.bevilacqua@fmc.units.it
Cadenaro
M
M
Biasotto
M
M
Di Lenarda
R
R
Dorigo
E
E
D002244:Carbon; D000077482:Carbon Fiber; D002516:Ceramics; D003116:Color; D003124:Colorimetry / Q000379:methods*; D003188:Composite Resins; D003764:Dental Materials; D003776:Dental Porcelain; D003793:Dental Restoration, Permanent; D006801:Humans; D011791:Quartz; D012822:Silicon Dioxide; D013053:Spectrophotometry; D015040:Zirconium
D000077482:Carbon Fiber; D003188:Composite Resins; D003764:Dental Materials; C481260:Lightpost; C083568:Z100 composite resin; D003776:Dental Porcelain; D011791:Quartz; D002244:Carbon; D012822:Silicon Dioxide; C037884:finesse; D015040:Zirconium