A Study on the Clinical Survey the Delayed Eruption of Teeth

Abstract

The objective of this investigation was to find the actual conditions that cause the delayed eruption of teeth.
The investigation involved of 76 children (40 boys and 36 girls) who complained of delayed eruption of teeth at the Pediatric Dental Clinic in the Suidobashi Hospital, Tokyo Dental College from April 1989 through June 1995.
Observations were as follows; the prevalence of the delayed eruption of teeth, the causes, and the average age at the exsamination of patients. The incidence of the delayed eruption of teeth was 7.2% of the new patients. There was no difference based on sex.
The total of the teeth for which the eruption was delayed amounted to 93. In the maxilla, the delayed eruption of teeth most often occurred among the central incisors, followed by the canines, lateral incisors, premolars, and first molars, subsequently. In the mandible, this most often occurred the first molars, followed by the canines, and lateral incisors.
The causes of the delayed eruption teeth in the maxilla most often were the abnormal position of teeth germ, followed by an apparent fibrous barrier, supernumerary teeth, retarded exfoliation of its predecessor teeth, effects of dental trauma to deciduous teeth, lack of space for eruption, follicular cysts, odontoma. In the mandible, the causes were only the abnormal position of the tooth germ or follicular cysts.