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Aim: To evaluate the spatial distribution of MIH opacities in first permanent molars (FPM). Materials and methods: an analysis of intraoral photographs of FPM with demarcated MIH opacities was conducted. The presence of opacity was computed in a digital matrix, discriminating the anatomical regions of the FPM surfaces. The frequencies of distribution of the opacities were descriptively analyzed through 227 FPM digital images of 89 children built in GIMP and Python and by Spearman correlation (= 0,05). Results: the occlusal surface was the most affected one (94% to 100%). In the upper FPM, the palatine surface was the second most affected one (84%-91%). In the lower FPM, the vestibular surface was the second most affected one (85%-80%). A similar pattern of opacity distribution was observed in the contralateral teeth. On smooth surfaces, opacities were more frequent in the regions closer to the occlusal surface than to the cervical one. Conclusion: MIH opacities were mostly present on occlusal, vestibular, and lingual/palatine surfaces, respectively. There is a possibility that the occurrences are in accordance with the chronology of dental formation.
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Objective @#To classify the furcation involvement (FI) of endodontically treated mandibular first permanent molars based on cone beam computed tomography (CBCT), provide reference for individualized treatment of FI. @*Methods@#CBCT images of the FI of 164 endodontically treated mandibular first permanent molars from 163 patients in Nanjing Stomatological Hospital, Medical School of Nanjing University were collected retrospectively. On the CBCT images, the shape and extent of periapical and periodontitis bone resorption, the thickness of residual dentin in the pulp floor and root canal wall, and the periodontal bone resorption of the complete dentition were evaluated. The FI was classified into periodontal, periapical, perforated and mixed types.@* Results@#Among the 164 FIs of endodontically treated mandibular first permanent molars, the periapical type was the most common (41.5%), followed by the mixed type (26.2%), perforated type (18.3%), and periodontal type (14.0%). Among the 68 periapical-type FIs of endodontically treated mandibular first permanent molars, 48.5% were proper root canal filling, 44.1% were insufficient filling and 7.4% were overfilling. Among the 43 mixed-type FIs, the periodontal mixed periapical type was the most common (72.1%).@*Conclusion @#Detailed evaluation and classification of furcation involvement could be performed using CBCT images; therefore, the study has guiding significance for clinical treatment.
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Introducción: el conocimiento del estado de salud bucal de la población escolar resulta una premisa indispensable para el desarrollo de una correcta planificación, organización y control de la atención estomatológica. Objetivo: determinar el estado de salud de los primeros molares permanentes en estudiantes de la Secundaria Básica “Luis Pérez Lozano”, del Área 7, Cienfuegos, de enero a diciembre de 2015. Materiales y Métodos: estudio observacional-descriptivo en un universo constituido por 197 niños de 7mo grado. El muestreo fue bietápico, combinando aleatorio, estratificado, proporcional y simple. Los datos se obtuvieron a través del examen bucal. Se tuvieron en cuenta las variables edad, sexo, estado de salud, y ubicación de los molares afectados. Resultados: el mayor porcentaje de primeros molares permanentes cariados correspondió al primer molar mandibular derecho e izquierdo para 11,9 % en el sexo masculino y el sexo femenino con primer molar permanente izquierdo para 11,6 %. Las obturaciones de los primeros molares mandibulares izquierdo predominó con un 16,6 % en el masculino y el mandibular derecho con un 13,9 % en las féminas. El mayor número de molares permanentes perdidos resultó en los inferiores, mandibular izquierdo en las niñas para 9,3 % y el molar mandibular derecho en los varones (7,1 %). Ambos sexos igualmente afectados con diferencia porcentual del 1%. El índice de Cluné obtuvo que los molares sanos para el sexo masculino representan 52,3 % y 53,4 % del femenino. Conclusiones: El estado de salud de los primeros molares permanentes en general se clasifica de regular pues existe un número considerable de afectados (AU).
Introduction: the knowledge of the school population´s oral health is a necessary premise for carrying out a correct planning, organization and control of the dental care. Objective: to determine the health status of the first permanent molars in students of the secondary school “Luis Pérez Lozano” of the health area 7, Cienfuegos, from January to December 2015. Materials and methods: an observational, descriptive study applied in a universe of 197 seventh-grade children. The sampling was two-staging, combining the randomized, stratified, proportional and simple sampling. The sample was obtained through the oral examination. The variables taken into account were age, sex, health status, and location of the affected molars. Results: the higher percentage of carious permanent first molars corresponded to the right and left mandibular first molar for 11,9 % in male sex and to the first left permanent molar in female sex with 11,6 %. The fillings of the first left mandibular molars predominated with 16,6 % in the male sex, and the right mandibular one in women with 13,9 %. The highest number of lost permanent molars was found among the lower ones, the left mandibular in girls (9,3 %) and the right mandibular in boys (7,1 %). Both sexes were equally affected, with a 1 % percent difference. The Clune’s index showed that healthy molars are 52,3 % for the male sex and 53,4 % for the female sex. Conclusions: in general, the first permanent molars´ health status is classified as regular because there is a substantial number of carious ones (AU).
Assuntos
Humanos , Masculino , Feminino , Adolescente , Saúde Bucal/educação , Saúde Bucal/normas , Adolescente , Dente Molar/fisiologia , Dente Molar/metabolismo , Fatores de Risco , Cárie Dentária/diagnóstico , Restauração Dentária Permanente , Estudo ObservacionalRESUMO
Objective @# To know the influencing factors of dental caries in first permanent molars among children aged 10-12 years old in Guangzhou, and to give references for dental caries prevention.@*Methods @#The samples were selected by stratified random sampling method. Oral health examination and questionnaires were applied to all the 18 656 children who were 5 or 6-grade in 149 primary schools. @*Results @#The prevalence of dental caries in first permanent molars was 18.19%. Girls accouted for 19.96%, which was significantly higher than that of boys (16.71%) (χ2 = 32.817, P< 0.001). Multiple regression analyses were used to investigate the influencing factors of dental caries in first permanent molars. After controlling school cluster and other factors, household register, gender, pit and fissure sealant, consumption of sweets and chocolates, consumption of sweet milk were influencing factors of permanent teeth caries. And household register, gender, pit and fissure sealant, consumption of sweets and chocolates were associated with mean DMFT.@*Conclusion @#school oral health education should focus on the consumption of sugars and cares should be put into the differences between urban and rural area. In addition, strengthening publicity of the sealant retention project,raising public awareness, and improving sealant retention quality are necessary to ensure the anti-caries effect.
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Objective @#To investigate the effectiveness of fluoride varnish in preventing first permanent molars caries inschool-age children and provide necessary information for oral health instruction. @*Methods@#378 children aged 6-7 years old in the first grade of primary school in dahua country, hechi city, Guangxi province (1 053 first permanent molars) were randomly recruited into 2 groups. The test group (542 first permanent molars in 191 children) was treated with fluoride varnish one time in a half year and given oral hygiene instruction 3 times; The control group (511 first permanent molars in 187 children) was only given oral hygiene instruction 3 times. All first permanent molars were checked after 18 months later for caries. @*Results@#After intervention, the caries prevalence rate in the test group raised from 21.99% to 27.75% compared with the control group from 24.60% to 37.43%. The caries incidence rate in test and control group was 5.76% and 12.83% respectively. There was a significant difference between 2 groups regardless of caries prevalence, caries incidence, the DMFT reduction, the DMFs reduction, the occlusal caries prevalence, the pit and fissure caries prevalence, the proximal caries prevalence. @*Conclusion @#Semi-annual application of fluoride varnish is effective in the prevention of dental caries in first permanent molars , which was worth of being popularized in clinic.