Tooth impaction is defined as any tooth that fails to erupt into a normal functional position and remains unerupted beyond the time at which it should normally erupt. Reports of impaction and eruption failure in primary teeth are relatively rare compared to permanent teeth. We report 2 rare cases where the second premolar was located on the occlusal side of the impacted mandibular second primary molar. In the first case, the succedaneous permanent tooth erupted after extraction of the primary tooth, fenestration, and traction. In the second case, the succedaneous permanent tooth erupted without fenestration or traction. Although the etiology of the tooth displacement was unknown in both cases, inhibition of the eruptive movement of the primary molar may have been associated with displacement of the succedaneous permanent premolar.
Regional odontodysplasia is a rare, severe, and nonhereditary developmental disorder in tooth formation and involves epithelial and mesenchymal-derived dental tissue. On radiographs, affected teeth have an abnormal morphology, a hypoplastic crown, and only a faint outline of hard tissue, a condition termed “ghost teeth.” We report clinical and radiographic findings from two children with regional odontodysplasia. Using computed tomography (CT), we calculated attenuation coefficients (i.e., Hounsfield units) for affected teeth and assessed the condition of dental follicles. To measure density, regions of interest were delimited and CT values were calculated. In our two patients, the CT values for enamel were lower in affected teeth than in sound teeth, while CT values for dentin were similar for affected and sound teeth. The average CT value for dental follicles in affected teeth was about 65 to 120, which suggests that dense fibrous connective tissues or hard tissue-like structures might be present in dental follicles. Analysis of CT values may be quite useful in the diagnosis and treatment of regional odontodysplasia.
Although the abused children had low self-esteem, after dental intervention, positive answers regarding oral health were obtained. The findings suggest that dental interventions might be effective for helping to improve the self-esteem of abused children.
Busulfan treatment in juvenile rats resulted in abnormal root development, depending on the stage at which Bu was administered. This abnormal development may result from the destruction of the HERS. The administration of Bu caused a shortage of HERS cells, which are required for normal root development. This disturbs root formation, resulting in osteodentin formation and a narrowed apex foramen.
The outcome of replantation of traumatically avulsed teeth depends largely on the immediate and appropriate management. However most dental injuries happen in the home or at school, where immediate treatment is not usually available. The objective of this study was to assess the knowledge and attitudes among guardians and children in Japan about tooth injuries, the management of avulsed teeth, and mouthguards. An 18-item questionnaire (3 general items about tooth injuries, 8 about the management of avulsed teeth and 7 about mouthguards) was distributed to 256 guardians and 92 children at the Pediatric Dental Clinic of Niigata University Dental Hospital. One-third of the respondents reported having had a tooth injury, but most had never been advised about the importance of emergency management in dental injuries. On the other hand, 185 guardians (72%) but only 21 children (23%) indicated an interest in taking an educational course about dental injuries. Approximately 75% of the respondents did not know that avulsed teeth could be replanted. Moreover, less than 20% knew that the best way to store avulsed teeth at home was to soak them in milk. Forty-five percent of those with this knowledge had obtained the information from TV programs, whereas only 10% received it from their dentist. As to mouthguards, while nearly 70% of the respondents knew what mouthguards are, only 13% of the children planned to use a mouthguard while playing sports, whereas 30% of the guardians reported that they would require their children to wear one during sports. This study revealed the need for educational campaigns to increase lay people's knowledge of emergency treatment for avulsed teeth and to encourage children to use mouthguards while playing baseball and basketball. information about emergency dental management. In this regard, several studies have investigated parental knowledge about emergency care for dental injuries and/or children's tooth avulsion 4-7). In an Australian study, more than 90% of 2,000 respondents had little knowledge of the correct procedures for replanting or transporting avulsed teeth 4). The apparent lack of knowledge among lay people led several countries to conduct educational campaigns on how to manage tooth injuries 5,8-10). To evaluate the effectiveness of educational campaign, a study in England examined lay knowledge on this issue 5). Sports are one of the most well-known causes of dental and oral injuries. These sports-related
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