[Coverage errors of five shade guide systems to vital natural teeth].
OBJECTIVE
To compare the coverage errors (CE) of five different shade guides in anterio vital natural teeth of selected people.


METHODS
Anterior vital natural teeth were measured with Crystaleye spectrophotometer, color coordinates of the teeth and five shade guides A (VITA Classical), B (VITA 3D-Master), C (Chromascop), D (Shofu Vintage Halo NCC) and E (Noritake)were analyzed with the supporting software. The CE of the five shade guide systems to natural teeth were evaluated in cervical, body and incisal regions, and difference in CE among shade guides was determined.


RESULTS
In the cervical region, shade guide A had the maximal CE value (3.09 ± 0.97) and shade guide D had the minimal CE value (1.62 ± 0.75).In the body region, CE of shade guide B (1.65 ± 0.64) and shade guide D (1.52 ± 0.74) were lower than those of shade guides A (2.04 ± 0.80), C (2.04 ± 0.90) and E (2.02 ± 0.84) (P < 0.05).In the incisal part, all CE were below 2.00, and again shade guide A had the maximal CE value (1.81 ± 0.86) and shade guide D had the minimal CE value (1.28 ± 0.55).


CONCLUSIONS
Within the limitation of the study, shade guide D had better color coverage of natural teeth in cervical, body and incisal regions.
Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, China.
Li
L
Chen
Jian-guo
JG
Tan
Ming-yue
MY
Liu
Jian-feng
JF
Zhou
Xiao-qiang
XQ
Liu
D000328:Adult; D000704:Analysis of Variance; D003116:Color / Q000592:standards*; D003124:Colorimetry / Q000295:instrumentation / Q000379:methods; D005260:Female; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology*; D008297:Male; D008334:Mandible; D008437:Maxilla; D017797:Prosthesis Coloring; D013053:Spectrophotometry / Q000295:instrumentation; D055815:Young Adult