[Delayed eruption of the premolar after pathological deciduous tooth root resorption].

The behaviour of eruption of lower premolars after pathological resorption of deciduous molar roots was examined on models and X-rays. The molars of the first dentition were shed earlier after pathological resorption of deciduous molar roots. Data of absence are measured in years in the presence of occlusal bone bridges. The middle values are more than three years. Eruption of permanent teeth happens years later or they remain impacted. Eruption dates of premolars after pathological deciduous root resorption and interruption of the lamina dura, and after physiological resorption are significantly earlier than if there is an occlusal bony bridge (p less than 0.01). The therapeutic consequence is the surgical liberation of such premolars and their removal.