Estudo in situ da rugosidade superficial de materiais hibridos de ionomero de vidro e resina composta submetidos a procedimentos de acabamento e polimento em função do tempo de permanencia na cavidade bucal

Orientador: Monica Campos SerraTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: Este estudo teve como objetivo avaliar a rugosidade superficial de duas resinas modificadas por poliácidos e de um ionômero de vidro modificado por resina, submetidos a doistrattmrentos superfzciais de acabamento e polimento, em função do tempo, através de um modelo experimental in situo Vinte voluntários utilizaram, durante 28 dias cansecutivos, dispositivos acrz1icos intra-bucais, contendo corpos-de-proVQ confeccionados com um ionômero de vidro modificado por resina - Fuji 11 LC lmproved (aC) e com duas resinas compostas modificadas por poliácidos - Compoglass F (Vivadent) e Dyract AP (Dentsply I DeTrey). Os corpos-de-prova de dimens&s padronizadas (n=20) foram submetidos a acabamento e polimento com um sistema de discos de lixa a base de óxido de alumínio (Sof-Lex - 3M) ou com pontas de resina impregnadas com éxido de alumínio (Enhance - Dentsply). O grupo controle não recebeu acabamento e polimento, sendo apenas polimerizado contra a superjIcie de uma tira de matriz de poliéster. A cada voluntário foi fornecido o mesmo tipo de escova dental e dentifrício, além de instruç1Jes especifzcas sohre a utilização e higieniz(Jfâo do dispositivo intra-hucal. A rugosidade superficial dos materiais foi quantificada através da medida da rugosidade média (RcJ de nove segmentos lineares predeterminad()s de cada c()rpo-de-pr()va, imediatamente após os procedimentos de acabamento e polimento (/'.0) e após 1 (1'J), 2(1'2), 3(1'3), 7(1'7), 14(1'14), 21 (l'21) e 28 (l' 28) dias de permanência no meio bucal. Para cada tempo estudado foi realizada uma análise .de covariância, considerando T{) como covariáveL Foram aplicadas a decomposição de soma de quadrados e a diferença mínima significativa de Tukey para estudar as interações signifzcativas e as comparações pareadas, ao nível de signiflCância de 5%. Os resultados foram significativos para o efeito da interação Material x Tratamento, exceto no T 28. Inicialmente, para os materiais Compoglass F e Dyract AP, o tratamento com Sof-Lex promoveu maior lisura superficial que Enhance. Os tratamentos com Sof-Lex e Enhance não .cliferiram entre si e aumentaram a rugosidade superficial de Fuji II LC Improved em relação ao controle. A() término da perÍOlJ() de ()bservaÇÕ(), ()S materiais híbridas de ionômer() de vidr() e resina composta submetidos a acabamento e polimento apresentaram rugosidade superficial semelhante ao controle, a despeit() da técnica utilizadaAbstract: The purpose of this study was to evaluate the surface roughness of two polyacid modified composite resins and a resin modified glass-ionomer submitted to two finishing and polishing treatments, as afunction oftime, using an in situ experimental modelo A resin modified glass­ionomer Fuji II LC lmproved (GC) and two polyacid modified composite resins Compoglass F (Vivadent) and Dyract AP (Dentsply / DeTrey) were analyzed. Cylindrical specimens with standardized dimensions were made using each material (n= 20). Surface treatments were erformed with Sof-Lex (3M) discs or Enhance (Dentsply) tips. Specimens of control groups were not submitted to surface treatments. Twenty volunteers ware palatal appliances in which nine specimens were flXed, during 28 days. The same kind of toothbrush and dentifrice were supplied to each volunteer. Standardized brushing technique was directed to them in order to clean the appliances up. Average surface roughness (Ra) was measured with a roughness tester (Surfcorder SE 1700) immediatelyafter the treatment (1'0) and after 1 (1'1), 2 (1'2),3(1'3), 7 (1'7J, 14 (1'14), 21 (1'21), 28 (1'28) days, under oral conditions. Nine readingsfor each specimen were averaged to give a single value. Data were submitted to Analysis of ovariance considering To values the covariate. Sums of squares decompositions followed by Tukey's Least-significant difference were used to study significative interactions and pairwise comparisons, at 5% significance levei. There was statistically significant effect of interaction Material X Treatment at each time period, excepted T28. lnitially, specimens of materiais Compoglass F and Dyract AP treated with Sof-Lex were smoother than which were treated with Enhance. There was not statistically significant difference between treatments with Sof­Lex and Enhance for Fuji 11 LC lmproved, but both increased its roughness, comparing to controlo After the exposed time to the oral conditions, it was possible to conclude that glass­ionomer composite resin hybrid materiais finished and polished surfaces presented roughness that was similar to untreated ones, regardless of the polishing methodDoutoradoDentísticaDoutor em Clínica Odontológic

Avaliação quantitativa da microinfiltração em cavidades de classe V restauradas com materiais hibridos de ionomero de vidro/resina composta

Orientador: Monica Campos SerraDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: O objetivo deste estudo "in vitro" foi avaliar quantitativamente a microinfiltração em cavidades de classe V restauradas com materiais híbridos de ionômero de vidro/resina composta, comparando-os com um cimento de ionômero de vidro e com um sistema de resina composta/adesivo dentinário. Foram preparadas cavidades cilíndricas na superfície radicular de 105 dentes humanos extraídos, a cerca de 4 mm da junção amelo-cemeotária. Os dentes foram divididos aleatoriamente em cinco grupos, cada um contendo 21 unidades experimentais. Os grupos controles foram restaurados com um cimento de ionômero de vidro ou com um sistema de resina composta/adesivo dentinário. Os grupos experimentais foram restaurados com três materiais híbridos de ionômero de vidro/ resina composta, sendo dois cimentos de ionômero de vidro modificados por resina e uma resina composta modificada por poliácido. Todos os dentes foram termociclados por 500 vezes, entre temperaturas de 5 ± 2 °C e 55 ± 2 °C, com um tempo de permanência de 1 minuto em cada banho. Em seguida, os espécimens foram imersos em solução aquosa de azul de metileno a 2%, por 24 horas, a 37 °C. A microinfiltração foi quantificada através de espectrofotometria e expressa em micrograma de corante por mililitro de solução. A análise estatística dos dados não indicou diferença significante entre os materiais (^2=5,37, a > 0,05). Sob as condições experimentais utilizadas neste estudo, pôde-se concluir que o desempenho dos materiais híbridos de ionômero de vidro/resina composta, frente à microinfiltração, foi similar ao do cimento de ionômero de vidro e ao do sistema de resina composta/adesivo dentinárioAbstract: The purpose of this "in vitro" study was to quantify the marginal leakage of three glass ionomer - composite resin hybrid materials in dentin cavities, compared with a glass ionomer cement and a bonded composite resin system. Standardized cylindrical class V cavities were prepared on root fecial surface of 105 extracted human uniradicular teeth, about 4 mm below the CEJ. The teeth were randomly assigned into five groups of 21 each. Control groups were restored with either a glass-ionomer cement or a bonded composite resin system. The experimental groups were restored with three glass-ionomer composite resin hybrid materials. All materials were manipulated according to manufacturers' instructions. The teeth were stored in distilled water at 37" C for 24 hours. After this storage period, the restorations were finished and polished with abrasive discs. All teeth were thermally stressed for 500 cycles with a dwell time of 1 min at 5° + 2 °C and 55° ± 2 °C, and subjected to dye penetration test (2 % methylene blue at 37 °C for 24 hours). The microleakage was quantified by spectrophotometry and was expressed as ja.g dye / mL. Statistical analysis indicated no significant differences among the five groups (x2-5.37, a > 0,05). Hence, it was concluded that glass ionomer -composite resin hybrid materials, glass ionomer cement and bonded composite resin system microleakage performances were similar, under the experimental conditionsMestradoDentísticaMestre em Clínica Odontológic

Validity of two occlusal indices for determining orthodontic treatment needs of patients treated in a public university in Belo Horizonte, Minas Gerais State, Brazil Validade de dois índices oclusais na determinação de necessidade de tratamento ortodôntico em pacientes tratados em uma universidade pública em Belo Horizonte, Minas Gerais, Brasil

The aim of the present study was to validate the dental aesthetic index (DAI) and index of complexity, outcome and need (ICON) based on the opinions of a panel of Brazilian orthodontists. A comparison of these two orthodontic treatment need indices was carried out based on the consensus of a panel of 20 experienced orthodontists. A set of 108 study casts representing the full spectrum of malocclusions was selected. A calibrated examiner scored the casts for both indices. The orthodontists individually rated the casts regarding the degree of orthodontic treatment need. The panel's mean rating of the need for treatment was used as the gold standard for evaluating the validity of the indices. The accuracy of the indices, as reflected in the area under receiver-operating characteristic curves, was high: DAI = 81.83% (95%CI: 71.21-92.44); ICON = 88.75% (95%CI: 78.57-98.92). Although the accuracy of the ICON was higher than that of the DAI, both indices are recommended for determining orthodontic treatment need in Brazil.O objetivo do presente estudo foi validar os índices dental aesthetic index (DAI) e index of complexity, outcome and need (ICON) a partir da opinião de um painel de ortodontistas brasileiros. A comparação desses dois índices de necessidade de tratamento ortodôntico foi feita baseada no consenso de um painel de 20 experientes ortodontistas. Um conjunto de 108 modelos de estudo representando uma grande variedade de tipos de maloclusão foi selecionado. Um examinador calibrado mensurou os modelos para ambos os índices. Os ortodontistas, de forma individual, avaliaram a necessidade de tratamento ortodôntico de cada modelo. O valor médio do painel de ortodontistas em relação à necessidade de tratamento foi utilizado como padrão-ouro para validação dos índices. Os valores de acurácia dos índices, medidos pela curva de característica de operação do receptor, foram altos: DAI = 81,83% (IC95%: 71,21-92,44); ICON = 88,75% (IC95%: 78,57-98,92). Embora a acurácia do ICON tenha sido mais alta do que a do DAI, ambos os índices são recomendados para determinar a necessidade de tratamento ortodôntico no Brasil

Effect Of Chlorhexidine Varnish On Gingival Growth In Orthodontic Patients: A Randomized Prospective Split-mouth Study.

Fixed orthodontic appliances patients suffer limitations on the effective control of biofilm by mechanical methods, bringing the need of a coadjutant in the control of inflammation and oral health improvement. The aim of this prospective split-mouth blind study was to analyze the effect of a 40% chlorhexidine (CHX) varnish on gingival growth of patients with orthodontic fixed appliances. Healthy teenage patients with fixed orthodontic appliances and increased gingival volume were recruited (n = 30). Each individual was his own control, having in the maxilla one control side and one treatment side. An application of varnishes occurred on the vestibular area of the upper premolars and first molar crowns, on the control side (placebo varnish) and on the experimental side (EC40(r) Biodentic CHX varnish). The varnishes and sides were randomly chosen and its identification and group was kept by a third party observer and it was not revealed to the researchers and participants until the end of study. In order to establish a baseline registration, digital photographs were taken by a trained photographer before varnish application at baseline (T0), as well as 14 days (T14) and 56 days (T56) after the application. The gingival volume was calculated indirectly using the vestibular areas (mm2) of the upper second premolars' clinical crowns by RapidSketch(r) software, at all study times. The data were analyzed using ANOVA and the Turkey-Krammer test. It was observed, in the final sample of 30 individuals, that at T0, the control and treatment groups were similar. At T14 and T56, a progressive reduction of the clinical crown area was seen in the control group, and an increase in the average area was detected in the experimental group (p < 0,05). The use of 40% CHX varnish decreases the gingival overgrowth in patients undergoing orthodontic treatment. Further studies are necessary to set the action time and frequency of application.2066-7