Malocclusions are widespread all over the world with high prevalence values and represent a social vulnerability and health problem because of the important burden of orthodontic treatment for both families and the public health service. The Italian Ministry of Health identified the principles for priority setting in dental care, i.e. patients with IOTN (Index of Orthodontic Treatment Need) 4-5 and those in particular conditions of health or social vulnerability.

中文翻译：

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在佩鲁贾（意大利）参加公共正畸服务的不断增长的患者群体中正畸治疗需求指数 (IOTN) 和咬合不正特征分布。

由于正畸治疗对家庭和公共卫生服务的重要负担，错牙合在世界各地普遍存在，患病率很高，并且代表了社会脆弱性和健康问题。意大利卫生部确定了牙科护理优先设置的原则，即 IOTN（正畸治疗需求指数）4-5 的患者以及健康状况或社会脆弱性特别强的患者。