磨牙因龋坏后而感染常波及到牙髓及根尖，在干髓治疗失败后引起慢性根尖周炎，在临床上较常见。干髓治疗失败引起的很尖周炎，治疗起来时间长而治愈率低。恢复比较困难，作者自1995年以来采用碘优内封治疗很尖周炎，临床上取得较满意的效果。临床资料1、病例数：慢性很尖炎55例 Morals due to decay after infection often spread to the pulp and apical pulp, caused after the failure of the treatment of chronic apical periodontitis, clinically more common. Acute periarthritis caused by failure of dry marrow treatment, long treatment time but low cure rate. Recovery is more difficult, the author since 1995, iodine gland closure treatment of periapical inflammation clinically achieved more satisfactory results. Clinical data 1, the number of cases: chronic very sharp inflammation in 55 cases