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Horizontal resorption according to the index suggested by Ericsson and Kurol [19]: (1) no resorption, intact root surfaces, and the cementum layer may be lost; (2) slight resorption, resorption up to half of the dentine thickness to the pulp; (3) moderate resorption, resorption midway to the pulp or more, the pulp lining being unbroken; (4) severe resorption, the pulp is exposed by the resorption.
