ПРЕЦИЗНОСТА НА ТЕСТ ПАСТИТЕ ВО ПРЕДВИДУВАЊЕ НА ФИНАЛНАТА БОЈА КАЈ МОНОЛИТНИ КЕРАМИЧКИ НАДОМЕСТОЦИ
ACCURACY OF TRY-IN PASTE IN PREDICTING THE FINAL COLOR OF MONOLITHIC CERAMIC RESTORATIONS

Summary/Abstract: The esthetic value of prosthodontic restoration largely depends on the alignment of their color and translucency with natural teeth. To get predictability of the final color in all ceramic restorations, the manufacturers, in the sets along with the shades of composite cement offer corresponding try-in pastes. Their accuracy and clinical acceptability are still an insufficiently researched field.The purpose of this paper was to determine whether the try in pastes used for monolithic lithium disilicate ceramic restorations testing, with a wall thickness of 0.5mm and 1mm, give the same final color as after cementing with the appropriate color composite cement, represented by Delta E and measured with a spectrophotometer.For the needs of this in vitro study a total of twenty-four (N = 24) identical monolithic crowns of lithium-disilicate glass ceramics IPS E.max® Press (Ivoclar Vivadent, Liechtenstein) were made of high translucent ceramics (HT) in A3 shade for upper second premolar. The crowns were made with different wall thicknesses of 0.5mm and 1mm. As a substrate for cementing the crowns, twenty-four tooth abutments with root extension were made from Te-Econom Plus® composite in A3 shade. For crowns cementation we used light curing composite cement Variolink estethic Lc, Ivoclar Vivadent in three shades neutral, light and yellow (warm) shade. Also, to test the crowns Variolink Esthetic Try-In Paste in the same shades as the cement was used. The final color of the crowns before and after cementation was measured with a non-contact intraoral spectrophotometer with optical geometry 45/0 ° ShadePilotTM (Degu Dent, Germany). For the interpretation of the results in the color differences we used the following threshold: E <1 unnoticeable color difference with human eye (perception threshold), E = 1- 3.3 clinically acceptable color difference (acceptance threshold),  E> 3.3 noticeable difference, clinically unacceptable difference.The results of the statistical analysis showed that there is no significant difference between the final Delta E measured before cementing with try-in paste and after cementing. The Delta E color difference were clinically acceptable. Delta E was highest in the yellow shade.From the obtained results we can conclude that the Try-in pastes of Variolink Esthetic (Ivoclar Vivadent, Liechtenstein) give satisfactory clinically acceptable accuracy in determining the definitive shade of the prosthodontic restorations.

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