Alteração de cor dentária originada pelo tratamento endodôntico: estudo clínico transversal

Abstract

The tooth discoloration originated from endodontic treatment is a challenge to clinical practice. This clinical cross-sectional study evaluated the influence of endodontic filling materials, cervical limit of root filling and tooth location on the color variation (∆E00) from 1 to 60 months of follow-up after endodontic treatment based on spectrophotometric analysis. Color records were obtained from 70 participants who received 83 endodontic treatments. ∆E00 was calculated by the CIEDE2000 method at 3 conditions: (baseline, homologous tooth versus endodontically treated tooth after ≤ 1 months); (baseline, homologous tooth versus endodontically treated tooth after > 1 to 12 months); (baseline, homologous tooth versus endodontically treated tooth after > 12 months up to 5 years) for each variable (endodontic filling material, cervical limit of root filling and tooth location). CIELAB color coordinates were measured on the homologous tooth (baseline) and endodontically treated tooth (after) with a spectrophotometer. Confidence intervals for the means (95% CI) were calculated, and the ∆E00 values and CIELAB individual color coordinates were compared for each pair of variables using the Student t or Welch tests (= .05). The lower ∆E00 values were observed to filling material (P= 0.000) and cervical cut (P= 0.000) in baseline versus > 12 months up to 5 years condition. The higher clinically and perceptively ∆E00 values was observed from zinc oxide and eugenol and mineral trioxide aggregate-based filling materials, cut at cervical level and anterior teeth. This indicates that material composition and procedures should be considered to avoid postoperative discoloration, mainly in anterior teeth due to thinner structure.