Conclusions: The 10% carbamide peroxide can provide an effective way to lighten discolored nonvital tooth.
结论：10%过氧化脲能有效地治疗变色无髓牙。
2
The 10% carbamide peroxide was injected into the chamber of the nonvital teeth and the reservoirs of the custom fitted trays. The nonvital teeth were bleached from both the inside and the outside.