Tooth discoloration caused by repair cements in a simulated regenerative endodontic procedure

Aim: The present study evaluated color changes caused by endodontic repair materials in a simulated regenerative endodontic procedure (REP). Methods: Fifty-six bovine incisors were randomly distributed into three experimental groups according to the repair cement placed over the blood clot [Conventional white MTA (Angelus), MTA Repair HP (Angelus), and Bio-C Repair (Angelus)] and a control group (n=14). Color measurements were taken before the access cavity preparation, one week, one month, three months, and six months after REP. The CIELAB system was chosen to calculate color change (ΔE), and the generalized estimating equations model was used to compare mean ΔE values between cements and periods. Results: Teeth from the three cement groups exhibited a clinically perceptible color change. No significant differences between groups were found in any experimental period. Within each group, MTA Repair HP and Bio-C Repair exhibited significantly greater color change at the six-month evaluation. Conclusions: The three endodontic repair materials caused similar changes in tooth color when used as a cervical plug in a simulated REP.