Cláudio Heliomar Vicente da Silva

The influence of storage time and pH variation on water sorption by different composite resins

OBJECTIVE The objective of this work was to assess the influence of storage time and pH cycling on water sorption by different composite resins. MATERIALS AND METHODS Nine resin brands were selected and divided into groups: G1-ROK (SDI), G2-ICE (SDI), G3-GLACIER (SDI), G4-Z350 (3M/ESPE), G5-Z250 (3M/ESPE), G6-TPH 3 (DENTSPLY), G7-ESTHET X (DENTSPLY), G8-SUPRAFILL (SSWHITE), and G9-MASTERFILL (BIODINΒMICS). Ninety specimens, ten per group, were obtained using an aluminum matrix. Specimens measured 10 mm diameter × 2 mm width. The groups were divided into subgroups according to the immersion solution: A - control (n = 05) stored in artificial saliva pH = 7.0 and B-test (n = 05) submitted to seven consecutive days of pH cycling (cariogenic challenger) that consisted of immersion in a pH° = 4.3 solution for 6 h followed by immersion in a pH¹ =7.0 solution for 18 h and stored in artificial saliva pH = 7.0 until the end of the experiment. The specimens were weighed on six occasions: T 0 (after fabrication), T 1 (24 h), T 2 (7 days), T 3 (15 days), T 4 (30 days), T 5 (60 days), and then analyzed. The water sorption was determined by the weight difference between the specimens at the time intervals. RESULTS The mean weight gain was exactly the same for both the subgroups within group G4. The highest means for the control subgroup were found in groups: G1, G5, G7, G8, and G9. For the pH cycling subgroup, the highest means were found in G2, G3, and G6; however, significant differences between the subgroups compared to the mean-weight gain were found for G1, G5, and G7. CONCLUSION The water sorption of composite resins is dependent upon their storage time. The pH cycling created a significant impact on resins G1, G5, and G7. The sorption and solubility of composite resins vary according to their chemical composition.

Manifestações Orais e Maxilofaciais Secundárias à Bulimia Nervosa: Uma Revisão Sistemática

Introducao: A bulimia nervosa e um tipo de transtorno alimentar (fortemente associado a questao do padrao de beleza corporal contemporâneo) que atinge cerca de 1 a 2% da populacao, com maior prevalencia no genero feminino, apresentando uma gama de alteracoes importantes e caracteristicas que acometem a regiao oral e maxilofacial. Objetivo: Realizar uma revisao da literatura a cerca das publicacoes sobre as manifestacoes bucomaxilofaciais secundarias a bulimia nervosa, demonstrando as alteracoes mais comuns e alertando o cirurgiao-dentista para o diagnostico precoce da doenca. Metodo: 54 artigos cientificos indexados (Medline, Lilacs, Scielo e Ibecs) sobre: bulimia nervosa, odontologia, erosao dentaria e saude bucal, entre 2005 e 2010, sofreram leitura critica para aquisicao de informacoes contidas de interesse ao estudo. Os artigos poderiam ser de revisao da literatura, relato de caso, serie de casos ou pesquisa clinica. Foram excluidos aqueles artigos que nao discorreram nem citaram pelo menos uma manifestacao maxilofacial secundaria a bulimia nervosa. Os resultados foram tabulados e estatisticamente tratados de forma descritiva. Resultados: Com base nos criterios de inclusao e exclusao, 31 artigos que falavam especificamente a cerca das manifestacoes bucomaxilofaciais secundarias a bulimia nervosa foram selecionados. Pode-se notar um elevado numero de publicacoes envolvendo revisoes de literatura em comparacao as pesquisas clinicas. O perfil epidemiologico dos pacientes revelou as mulheres adultas jovens como grupo de risco, associado as mais prevalentes manifestacoes como: erosao e sensibilidade dental, aumento no indice de carie, mucosite, queilite e gengivite. Conclusao: As manifestacoes bucomaxilofaciais secundarias a bulimia nervosa podem acometer em graus variados as estruturas duras e moles desta regiao anatomica. Dentre todas as alteracoes, a erosao dental foi a mais prevalente em tecido duro e a mucosite em tecido mole.

Perfil dos discentes ingressos do Centro de Ciências da Saúde UFPE

Carrying out surveys that attempt to understand the characteristics and opinions of students at university level may provide important information for planning and reorganizing academic development. In order to profile the students of the Center for Health Sciences, at the Federal University of Pernambuco, questionnaires were distributed to the academics in the second term of the course, containing questions regarding their socio-economic and personal aspects. The profile of students (n = 210) was characterized by a predominance of females, aged between 19 and 21 years, who had been to private schools, were from the most economically advantaged social classes, and had been greatly influenced by their family regarding career choice. Most students were not enrolled in the courses they had chosen as their first option, but had high expectations about the course, and considered that the course met their expectations. After finishing the course, most students intend to take a postgraduate course and work in public service. One problem that remains concerning the choice of the profession, is that it might be determined by socio-economic status and family influence.

Influência de pontas diamantadas CVD sobre o selamento marginal de um primer autocondicionante

Alterations produced on the dental surface after cavity prepa- ration may influence the effecti- veness of the restoring procedure. The purpose of this study was to verify the influence of CVD system burs on marginal sealing of a self- etching primer (Clearfil SE Bond - Kuraray). Twenty-four class II cavities were made in twelve hu- man molars, with 12 cavities per group: G1 - (CVD system); G2 (conventional diamond burs). Af- ter the placement of restorations (Clearfil SE Bond+Clerafil AP- X/Kuraray), the teeth were sto- red in saline solution (24 hours, 37 °C), thermocycled (500 cycles, 5°/55 °C, with a dwell time of 15 seconds), immersed in basic fuc- sin (24 hours, 37 °C), washed and sectioned through the gingival margin for verification. The mi- croleakage scores ranged from zero (no microleakage) to 3 (ma- ximum microleakage). The Mann Whitney test did not indicate a statistical difference between the subgroups G1 and G2, and betwe- en enamel and dentine of a same group (p>0,05). However, abso- lute results demonstrated that CVD system exercised negative influence on the marginal sealing of the restorations performed with the studied self-etching primer. Key words: dental cavity prepa- ration, dentin-bonding agents, dental leakage.

Estudo comparativo da resistência radicular à fratura em função do comprimento e da composição do pino

O objetivo deste estudo foi comparar in vitro a resistencia a fratura de raizes restauradas por pinos intrarradiculares pre-fabricados metalicos e esteticos cimentados em diferentes profundidades. Foram utilizados trinta incisivos centrais humanos extraidos, que tiveram seus comprimentos radiculares padronizados em 14 mm. As amostras foram tratadas endodonticamente e divididas aleatoriamente em tres grupos de dez raizes cada: Grupo I, pinos pre-fabricados de fibra de vidro (Reforpost no 2 - Angelus®, Londrina, PR, Brasil) cimentados no limite de dois tercos do conduto radicular; Grupo II, pinos pre-fabricados metalicos (Reforpost II - Angelus®, Londrina, PR, Brasil) cimentados no limite de dois tercos do conduto radicular e Grupo III, pinos pre-fabricados de fibra de vidro (Reforpost no 2 - Angelus® , Londrina, PR, Brasil) cimentados no limite de um terco do conduto radicular. Os pinos em estudo foram cimentados utilizando-se o sistema adesivo Single Bond® (3M/ESPE, Sumare, SP, Brasil) e o cimento resinoso RelyX® ARC (3M/ESPE, Sumare, SP, Brasil). Apos a cimentacao dos pinos, as raizes foram incluidas em tubos de PVC, sendo os corpos-de-prova submetidos a cargas compressivas com angulacao de 45° em relacao ao longo eixo da raiz e com deslocamento de 0,5 mm/min ate que houvesse fratura da raiz e/ou do pino. Os resultados foram submetidos a analise de variância com nivel de significância de 5 % e mostraram nao haver diferenca estatisticamente significativa entre os grupos avaliados.

Emprego do Cimento de Ionômero de Vidro: Uma Revisão Sistemática

1Doutoranda em Odontologia pela Universidade Federal de Pernambuco (UFPE), Recife/PE, Brasil. 2Mestre em Odontologia pela Universidade Federal de Pernambuco (UFPE), Recife/PE, Brasil. 3Professora Associada do Departamento de Protese e Cirurgia Buco-Facial da Universidade Federal de Pernambuco (UFPE), Recife/PE, Brasil. 4Professor Adjunto do Departamento de Protese e Cirurgia Buco-Facial da Universidade Federal de Pernambuco (UFPE), Recife/PE, Brasil.