Answer a: A 30% solution of Superoxyl and sodium perborate are common materials used in the non-vital chair-side and walking bleach techniques. Heating the bleaching solution in the chamber can double the incidence of resorption. (Pathways of the Pulp 8th, p755)
The majority of cases of external root resorption appear in patients under the age of 25. It is speculated that this is due to larger pulp canal systems the greater number of patient tubules. Evidence usually does not manifest for 6 months therefore recall are essential. Their repair can sometimes be initialized by calcium hydroxide to arrest the lesion, then flap for access surgery, orthodontic extrusion, or crown lengthening surgery.
Therefore it is recommended that after removal of the gutta percha from the chamber and pulp horns, a barrier of a GI or RMGI be placed 2mm thick at a level 1mm incisal to the CEJ. (Pathways of the Pulp 8th, p756)
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