Results. Four cluster groups from 50 participants were identified in the clustering analysis. The DE was statistically significant for the interaction between the dental third and cluster groups (P<.001). Cluster groups 1 and 4 exhibited statistically higher DE values than cluster groups 2 and 3 (P<.05). Greater chromatic alterations were noted in the incisal third of the teeth than in the cervical and medium thirds in the cluster groups 1 (DE=11.03 ±1.22) and 3 (DE=4.14 ±1.14) (P<.05). No relationshipwas found with the participants’ personal opinions about color change (P>.05).
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