2014, Vol.41, No.3

Journal of the Korean academy of pediatric dentistry 2023 KCI Impact Factor : 0.48

pISSN : 1226-8496 / eISSN : 2288-3819
https://journal.kci.go.kr/jkapd

The number of reported traumatic injuries has been increasing in recent years, particularly that of dentaltrauma in children and adolescents. While the risks associated with dental trauma in this population have beenincreasingly realized, domestic reports on this issue seem to be insufficient. The purpose of this study was to investigate the prevalence of dental trauma and to evaluate the relevant riskfactors and the level of self-recognition. 1,371 adolescents attending middle schools at Yangsan were surveyedvia clinical examination and questionnaire; the results were as follows:According to the clinical examination, the overall prevalence of dental trauma was 16.8% with preponderanceof males (19.2%) compared to females (13.7%) (p < 0.05). The average number of injured teeth per adolescentwith a history of trauma was 1.34. Comparing the prevalence, maxillary central incisors and enamel fractureoccupied the highest ranks by tooth type and mode of trauma, respectively. Class II division 1 malocclusion andoverjet exceeding 8.0 mm were identified as significant risk factors (p < 0.05). The degree of self-recognition ofdental trauma showed a low coincidence rate compared with results of the clinical examination. Males expresseda higher level of satisfaction toward the results of treatment for dental trauma than females (p < 0.05).

The purpose of the present study was to evaluate the relationship between the malocclusion and dental cariesin adolescents with permanent dentition. The subjects of the study were 385 adolescents aged 12 to 15 years. Dental Aesthetic Index (DAI) and DMFT index were recorded as clinical indicators of malocclusion and dentalcaries. The mean Dental Aesthetic Index (DAI) score of the subjects was 12.42 and the mean DMFT index of thesubjects was 2.89. Four students (1.04%) were included in the group of orthodontic treatment mandatory,which signifies the handicapping malocclusion. Moreover, the result of gender-specific analysis of the DAI componentsobserved that the prevalence of midline diastema and mandibular overjet were significantly higheramong boys (p < 0.05). In 7 components (missing teeth, incisal segment crowding, maxillary anterior irregularity, mandibular anteriorirregularity, mandibular overjet, anterior openbite, antero-posterior molar relationship) among the 10 DAI components,abnormal groups showed significantly higher DMFT index than normal groups (p < 0.05). The subjects in the group of definite to handicapping malocclusion (DAI ≥ 26) showed significantly higherDMFT index than the subjects in the group of minor or no malocclusion (p < 0.01). In addition, the DAI scorehad significant positive linear correlation with the DMFT index (r = 0.584, p < 0.01). Consequently, the current findings suggested a positive relationship between the malocclusion and cariesprevalence. And several specific types of malocclusion were supposed to be significantly correlated with dentalcaries.

This study was designed to evaluate the effectiveness of 5% sodium fluoride-polyvinyl alcohol (NaF-PVA) tapeinfluencing enamel remineralization by analysing enamel surface microhardness (SMH) and variation of ΔF ofQLF. After enamel demineralizing of specimen, these 60 specimens with average KHN of microhardness rangingfrom 50 to 100 and with ΔF of QLF ranging from -15 to -25 were divided into four groups : group 1 (controlgroup), group 2 (NaF-PVA), group 3 (fluoride varnish, FluoroDose varnish), group 4 (Casein phosphopeptideamorphouscalcium phosphate, Tooth mousse plusTM). These specimens were treated with materials and thenimmersed in artificial saliva. We measured remineralization rate each using surface microhardness (SMH) andQuantitative light-induced fluorescence digital (QLF-D). As a result, NaF-PVA tape is better than group 1, 4 and have comparable remineralization effect with group 3(p < 0.05).