Unexpected formation of root-like structures subsequent to the avulsion of immature permanent teeth: Case report.

This report describes the unexpected formation of root-like structures following the avulsion of immature permanent teeth without replantation. A 6-year-old female patient had avulsed the four permanent mandibular incisors and the two deciduous mandibular canines. The patient was seen in an emergency healthcare unit but did not receive specialized treatment for tooth replantation. As follow-up treatment, she received a removable prosthesis. After 4 years of follow-up, an image obtained by panoramic radiography showed formations similar to four root structures in the alveolus of the previously avulsed permanent teeth. This finding was confirmed by periapical radiography and computed tomography. This case report demonstrates that in teeth with incomplete root development, even after avulsion without replantation, cells from the pulp stump may have the capacity to form mineralized structures that appear radiographically comparable to root dentin.

Impact of molar incisor hypomineralization on quality of life in children with early mixed dentition: A hierarchical approach.

BACKGROUND: Molar incisor hypomineralization (MIH) is associated with unfavourable dental conditions such as dental caries and may consequently impact oral health-related quality of life (OHRQoL). OBJECTIVE: To assess the impact of MIH on OHRQoL in children with early mixed dentition. METHOD: A population-based cross-sectional study of 728 8-year-old children from the public school system in Curitiba, Brazil, was conducted. The Child Perception Questionnaire for 8- to 10-year-olds (CPQ8-10 ) was used to evaluate OHRQoL. MIH was diagnosed according to the European Academy of Paediatric Dentistry (EAPD) criteria. The assessments of MIH, dental caries, and malocclusion were performed by four calibrated examiners (κ ≥ 0.80). Demographic and socioeconomic data (DSE) were obtained from the children's parents/caregivers using a structured questionnaire. The analysis of OHRQoL determinants was performed through a three-level hierarchical approach: mesial (DSE), intermediate (clinical conditions), and distal (child's oral self-perception), using Poisson regression with robust variance (α = 0.05). RESULTS: The prevalence of MIH was 12.1% (95% CI: 10-15). An association was found between MIH and OHRQoL in the "oral symptoms" domain of the CPQ8-10 (PR: 1.07, 95% CI: 1.03-1.11, P < 0.001) after adjusting for other clinical variables and DSE. CONCLUSION: Molar incisor hypomineralization was associated with a greater impact on OHRQoL in children's oral symptoms.

In vitro toxicity of MTA compared with other primary teeth pulpotomy agents.

OBJECTIVE: The main goal of this work is to compare the In vitro toxicity of MTA with other primary teeth pulpotomy agents. STUDY DESIGN: The In vitro toxicity of MTA, calcium hydroxide, ferric sulphate solution, diluted formocresol and Buckley's formocresol were tested using MTT and Neutral Red Uptake cell viability assays. The results for MTA were compared to those obtained for the other substances using ANOVA and Tukey statistical tests (p < 0.05). RESULTS: MTA had the lower in vitro toxicity and Buckley's formocresol, the higher, with statically significant difference. CONCLUSION: Among the primary teeth pulpotomy agents tested, MTA showed the lower In vitro toxicity, standing as the most promising substitute to formocresol.

Developmental defects of enamel in phenylketonuria patients.

PURPOSE: The purpose of this study was to determine the prevalence of developmental defects of enamel in patients diagnosed with phenylketonuria (PKU). METHODS: The study group consisted of 24 four- to 24-year-old subjects with PKU. The control group consisted of 24 healthy individuals. An examination for the detection of developmental defects of enamel was conducted at the university pediatric dentistry clinic by a single examiner. Data were analyzed using the chi-square test (P<.05) and odds ratios. RESULTS: The prevalence of developmental defects of enamel was 36 percent in the study group and 15 percent in the control group. The maxillary central incisors were the most affected teeth in patients with PKU, while the maxillary and mandibular first molars were the most affected teeth in the control group. Patients with PKU had a 3.3-fold greater chance of exhibiting developmental defects of enamel versus the healthy controls, which was statistically significant (P<.001). CONCLUSION: The study findings suggest that PKU increases the risk of developmental defects of enamel.

The relationship between dental anxiety in children, adolescents and their parents at dental environment.

PURPOSE: The aim of the present study was to compare trait anxiety and dental anxiety among children, adolescents and their parents. MATERIALS AND METHODS: A cross-sectional study was conducted involving 100 patients from the Pediatric Dentistry Clinic of the Federal University of Parana (Brazil) between the ages of 8 and 17 years (mean age: 10.3; standard deviation: 2.03) and their parents, who responded to Corah's Dental Anxiety Scale (DAS) and the Trait Anxiety Scale. The data were analyzed using the Mann-Whitney test, analysis of variance and both Pearson's and Spearman's correlation coefficients. RESULTS: Ninety percent of children and adolescents and 76% of the parents had moderate anxiety based on the DAS score. Seventy-four percent of children and adolescents and 72% of the parents had moderate anxiety based on the Trait Anxiety Scale score. The trait anxiety and dental anxiety scores were correlated among the adults (rs = 0.64) and children (r = 0.52), whereas no correlation between scores was found among the adolescents. Associations were also found between children's trait anxiety and the dental and trait anxiety of their parents (both r = 0.43). CONCLUSIONS: A moderate degree of dental anxiety was prevalent among the children, adolescents and parents who took part in this investigation, with correlations demonstrated between some trait anxiety and dental anxiety scores.