BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI
buletinul institutului politehnic din iaşi - Universitatea Tehnică ...
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Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 57<br />
teeth, a inherent consistency among shade guides, and matching between shade<br />
guides and the dental materials (eg. porcelains, resin composites or dentures).<br />
Fig. 7 – Shade guide “VITAPAN 3D-MASTER”<br />
(http://www.globaldentalsolutions.com/shadeguides.html).<br />
Unfortunately, the currently available shade guides do not have all the<br />
mentioned properties and not all shade guides are fabricated from the dental<br />
materials to which they will be matched (O’Brien, 2008).<br />
For the dental office and laboratory, shade matching is a very complex<br />
process (Fig. 8).<br />
Fig. 8 – Schematic representation of the shade-matching transmission after O’Brien.<br />
It is necessary to respect some recommendations:<br />
i) use the manufacturer shade guide for fabricating the dental restoration;<br />
ii) remove the individual shade tab from the guide and hold it close to the<br />
tooth for shade matching;<br />
iii) respect the manufacturer's recommendations for preparing the surface<br />
of the tooth for shade matching;<br />
iv) match the surface texture of the dental restoration to that of the<br />
remaining dentition as closely as possible;<br />
v) choosing a neutral chromatic environment;<br />
vi) the choice of color is always done at the beginning of the treatment<br />
session;<br />
vii) lighting conditions similar to daylight;<br />
viii) remove lipstick and makeup from the face of the patients;<br />
ix) patient mouth should be at the doctor eye level;<br />
x) the choice of color, by comparison, must not exceed 5 seconds, to<br />
avoid fatigue of the cone cells;