Silvio Issáo Myaki

Microhardness of glass ionomer cements indicated for the ART technique according to surface protection treatment and storage time

The aim of this study was to assess the microhardness of 5 glass ionomer cements (GIC) - Vidrion R (V, SS White), Fuji IX (F, GC Corp.), Magic Glass ART (MG, Vigodent), Maxxion R (MR, FGM) and ChemFlex (CF, Dentsply) - in the presence or absence of a surface protection treatment, and after different storage periods. For each GIC, 36 test specimens were made, divided into 3 groups according to the surface protection treatment applied - no protection, varnish or nail varnish. The specimens were stored in distilled water for 24 h, 7 and 30 days and the microhardness tests were performed at these times. The data obtained were submitted to the ANOVA for repeated measures and Tukey tests (alpha = 5%). The results revealed that the mean microhardness values of the GICs were, in decreasing order, as follows: F > CF = MR > MG > V; that surface protection was significant for MR, at 24 h, without protection (64.2 + or - 3.6a), protected with GIC varnish (59.6 + or - 3.4b) and protected with nail varnish (62.7 + or - 2.8ab); for F, at 7 days, without protection (97.8 + or - 3.7ab), protected with varnish (95.9 + or - 3.2b) and protected with nail varnish (100.8 + or - 3.4a); and at 30 days, for F, without protection (98.8 + or - 2.6b), protected with varnish (103.3 + or - 4.4a) and protected with nail varnish (101 + or - 4.1ab) and, for V, without protection (46 + or - 1.3b), protected with varnish (49.6 + or - 1.7ab) and protected with nail varnish (51.1 + or - 2.6a). The increase in storage time produced an increase in microhardness. It was concluded that the different GICs, surface protection treatments and storage times could alter the microhardness values.

Avaliação clínica de vinte e quatro meses do Fluroshield e do Vitremer utilizados como selante de fossas e fissuras

The clinical performance of two dental materials used as pit and fissure sealants (Fluroshield and Vitremer) was evaluated. Forty-six sound upper or lower premolars were sealed. Twenty-three teeth were sealed with Vitremer and 23 with Fluroshield. After six, twelve, and twenty-four months Vitremer presented a total retention of 91.30%, 91.30%, and 82.60%, and Fluroshield presented a total retention of 100% in the three periods of evaluation. Both materials do not permit the development of caries, independent of their retention and period of evaluation.

Resposta pulpar de dentes decíduos de cães a um sistema adesivo ou ao cimento de hidróxido de cálcio

O objetivo deste estudo foi de avaliar a resposta pulpar de dentes deciduos de caes a um sistema adesivo ou a um cimento de hidroxido de calcio apos exposicao mecânica da polpa. Foram utilizados tres caes sem raca definida, e nestes foram realizados dez preparos cavitarios classe V. Uma exposicao pulpar mecânica foi produzida com uma sonda exploradora esterilizada, na porcao central de cada cavidade. A hemorragia foi controlada com bolinhas de algodao esterilizadas. O esmalte, dentina e local da exposicao pulpar de cinco dentes foram condicionados com acido fosforico a 35%, seguido da aplicacao de um sistema adesivo (Scotchbond Multi-Uso - 3M). Nos outros cinco dentes, um cimento de hidroxido de calcio (Hydro C - Dentsply) foi aplicada no local da exposicao pulpar antes da aplicacao do mesmo sistema adesivo. Todos os dentes foram restaurados com uma resina composta (Z-100 - 3M). Apos 7, 30 ou 45 dias os caes foram anestesiados e perfundidos com solucao salina seguida de uma solucao de formalina neutra tamponada. A maxila e a mandibula foram seccionadas em tres partes e estocadas em uma solucao para desmineralizacao. Apos a desmineralizacao ossea, todos os dentes foram cortados, incluidos em parafina e seccionados longitudinalmente. A seguir todos os dentes foram corados com hematoxilina e eosina e observados em microscopio de luz. Os resultados demonstraram a presenca e persistencia de uma resposta inflamatoria de diferentes intensidades nos tres periodos experimentais. Nao houve variacao na resposta inflamatoria pelos diferentes tratamentos propostos.

Experiência de cárie dentária em crianças atendidas em um programa de Odontologia para bebês

Objective: To assess the impact of the Dentistry for Infants early dental care program run by Jacarei County (SP) by comparing the caries of individuals participating and not participating in this program. Methods: In total, 300 children between 0 and 48 months old were assessed in the following two groups: infants not participating in the program (G1, n = 100) and infants participating in the program (G2, n = 200). Each group was further divided according to age in subgroups of 0 to 24 months and 25 to 48 months. All children were clinically assessed for carious lesions using the visual-tactile method. The data were statistically analyzed using a paired Students t-test, Mann-Whitney test, and X² test at a 5% significance level. Results: There was a significant difference in the prevalence (P) and mean index of deciduous teeth (deft) (C) that were decayed, indicated for extraction and filled, and the highest values were observed in G1 (p Objetivo: Avaliar o impacto na saude bucal de criancas atendidas em um programa de atencao precoce Odontologia para Bebes da prefeitura do municipio de Jacarei (SP), por meio da comparacao da experiencia de carie entre individuos participantes e nao participantes do programa. Metodos: Foram avaliadas 300 criancas de 0 e 48 meses de idade, as quais foram divididas em 2 grupos: G1Bebes nao participantes do Programa (n = 100) e G2 Bebes do Programa (n = 200). Cada grupo foi subdividido em dois, o primeiro com criancas de 0 a 24 meses, e o segundo de 25 a 48 meses. Todas as criancas receberam avaliacao clinica quanto a presenca de lesoes de carie (metodo tactil e visual). Os dados foram tabulados e analisados estatisticamente pelos testes t de Student pareado, Mann-Whitney e X², com nivel de significância de 5%. Resultados: Houve diferenca estatistica para a prevalencia (P) e o indice medio de dentes deciduos cariados, com extracao indicada e obturados (ceod) (C), sendo os maiores valores observados para G1(p

Oral health promotion in early childhood: age of joining preventive program and behavioral aspects

ABSTRACT Objective: To analyze the interference of age in the entrance into a public dental care program for infants as well as family behavioral aspects about tooth decay experience in children 0 to 4 years old. Methods: Cross-sectional study involving 465 children who were divided into 3 groups: infants whose mothers joined the program during pregnancy (n=50); infants enrolled in the program during the first year of life (n=230); and infants enrolled in the program between 13 and 18 months old (n=185). The χ2 and Kruskal-Walis tests (95% confidence interval) were used to assess the relationship among variables. Results: There was an association between the age of entrance in the programs and dental caries (p<0.001). A lower prevalence was seen in infants whose mothers joined the program during pregnancy, and among those infants enrolled in the program during the first year of life. The same low prevalence occurred in relation to mothers commitment to attend follow-up visits with their infants, cariogenic diet, nighttime oral care, duration of night feeding and parents educational level (p<0.001). Unfavorable socioeconomic conditions (p>0.05) and daily oral care (p=0.214) were common variables in the groups with 99% of occurrence. Commitment to attend follow-up visits, nighttime oral care and parents educational level (p>0.05) were considered protective factors for dental caries. Cariogenic diet and night feeding were determinant factors to the appearance of dental caries. Conclusion: To promote children oral health it is essential to enroll children in oral health programs and adopt healthy habits as early as possible, besides the adherence of the child to their parents advice.

Bond strength and morphology of resin materials applied to the occlusal surface of primary molars

BACKGROUNDnHydrophilic adhesives may be used as pit and fissure sealants (sealants), but there is concern about the ability of self-etching adhesives to bond sealants to enamel.nnnAIMnTo study the bond strength (BS) and morphology of adhesive systems used as sealants.nnnDESIGNnOptiBond FL, OptiBond All-in-One, combined OptiBond All-in-One+OptiBond FL adhesive, and Fluroshield were applied to the occlusal surfaces of 16 primary molars (n = 4). Teeth were stored in distilled water (24 h at 37°C) and sectioned through the interface to obtain sticks (0.8 mm(2) ) tested under a tensile load (0.5 mm/min). Failure modes were observed. Data were analysed by ANOVA and Tukeys tests (α = 5%). The morphology of 12 primary molars was examined in terms of the etching pattern and resin reproduction.nnnRESULTSnDifferences in the BS were found (P = 0.001), with OptiBond FL showing the highest (36.84 ± 5.7 MPa), Fluroshield (24.26 ± 2.13 MPa) and OptiBond All-in-One (17.12 ± 4.97 MPa) similar, and OptiBond All-in-One + OptiBond FL adhesive the lowest (9.8 ± 2.94 MPA). OptiBond FL showed the best results in terms of morphology.nnnCONCLUSIONnUnder the conditions of this study, OptiBond FL was the best material to be used for sealing.

Effects of a non-rinse conditioner on the enamel of primary teeth

The aim of this in vitro study was to evaluate by scanning electron microscopy the morphological aspects of the enamel of primary teeth after etching with 36% phosphoric acid or a non-rinse conditioner. Ten naturally exfoliated anterior primary teeth were selected. The samples were subjected to prophylaxis with pumice paste and water using a low-speed hand piece. Etching was done on the buccal surface. Specimens were divided into 2 groups: G1 (n=10): etching with 36% phosphoric acid gel - Conditioner 36 (Dentsply) for 20 s, followed by water rinse for 15 s; G2 (n=10): etching with NRC - Non Rinse Conditioner (Dentsply) for 20 s, followed by air drying for 15 s. The samples were dehydrated, mounted on metal stubs, coated with gold and observed with Jeol JSM-6100 scanning electron microscope. Electron-micrographic analysis showed that both etching agents were effective for etching the enamel of primary teeth causing the formation of microporosities on the enamel surface, although the etching pattern was more effective with the use of 36% phosphoric acid gel.

Dentistry for babies: caries experience vs. assiduity in clinical care

Aim: This study analyzed and compared the experience of dental caries in 300 children aged 0 to 48 months, who were participants and non-participants of a preventive program ‘Dentistry for babies’, as well as the correlation between assiduity of dental visits and experience of dental caries. Methods: The subjects were randomly selected and divided into two groups: G1 ‘Non participant children of the Program’ (n=100) and G2 ‘Participant Children of the Program’ (n=200). Each group was subdivided in two subgroups: 0-24 months and 25-48 months. The collected data from G2 were analyzed, relating the variation of the dmft index (dmft refers to primary teeth: d = decayed, m = missing/extracted due to caries, f = filled, t = teeth) (C) and dental caries prevalence (P) with the influence of assiduity factor in each subgroup. To collect data, clinical examinations were performed using tactile and visual criteria by a single calibrated examiner. The data were statistically analyzed using the ‘paired t-test’, ‘Mann-Whitney’ and ’Chi-Squared’ tests (p<0.05). Results: It was found that prevalence and dmft index were statistically significant (P=0.0001) with the greatest values observed in G1 (p=0.0001). The values were: PG1 (73%), PG2 (22%), CG1 (3.45±3.84), CG2 (0.66±1.57). Assiduity was significant in G2 (p=0.0001). The values observed were: P-Assiduous (2%), P-Non-assiduous (42%), C-Assiduous (0.04±0.31), and C-Non-assiduous (1.29±2.01). Conclusions: The participation in the program had a positive influence on the oral health of babies. Complete assiduity to the program resulted in the lowest rates and prevalence of dental caries.

Dental caries in children participating in a Dentistry for infants Program

OBJECTIVEnTo assess the impact of the Dentistry for Infants early dental care program run by Jacareí County (SP) by comparing the caries of individuals participating and not participating in this program.nnnMETHODSnIn total, 300 children between 0 and 48 months old were assessed in the following two groups: infants not participating in the program (G1, n = 100) and infants participating in the program (G2, n = 200). Each group was further divided according to age in subgroups of 0 to 24 months and 25 to 48 months. All children were clinically assessed for carious lesions using the visual-tactile method. The data were statistically analyzed using a paired Students t-test, Mann-Whitney test, and χ2 test at a 5% significance level.nnnRESULTSnThere was a significant difference in the prevalence (P) and mean index of deciduous teeth (deft) (C) that were decayed, indicated for extraction and filled, and the highest values were observed in G1 (p < 0.0001). The values were as follows: PG1, 73%; PG2, 22%; CG1, 3.45 ± 3.84; and CG2, 0.66 ± 1.57.nnnCONCLUSIONnParticipating in the program positively impacted the infants oral health.

Efeitos do ácido fosfórico nas concentrações de 10% ou 32% sobre a superfície do esmalte dental: estudo ao microscópio eletrônico de varredura

O objetivo deste estudo in vitro foi de avaliar os efeitos de duas diferentes concentracoes de acido fosforico e tempos de condicionamento, na morfologia do esmalte dentario de premolares humanos higidos. A superficie vestibular de 18 premolares extraidos de pacientes jovens, foi submetida a acao do acido fosforico nas concentracoes de 10% ou 32% por 15, 30 ou 60 segundos. Os resultados obtidos ao microscopio eletronico de varredura demonstraram a formacao de uma superficie de esmalte rugosa, com padroes variaveis de condicionamento, independentemente do tempo de aplicacao e das concentracoes utilizadas.