Tooth discoloration and internal bleaching after the use of ledermix paste with various bleaching agents - An study.

Background: To assess the reversal of discolouration caused by Ledermix using various bleaching agents.

Material And Methods: Twenty six extracted human mandibular premolars were taken and divided into four groups. Six teeth were divided into three each which are taken as positive and negative controls.

Evaluation of manual and two-rotary niti retreatment systems in removing gutta-percha obturated with two root canal sealers.

Objective. The objective of this study was to evaluate the efficacy of two retreatment NiTi systems (protaper universal retreatment files, R-Endo), when compared to manual technique in removing Gutta-percha obturated with two sealers. Study Design.