RESUMO
PURPOSE: This study evaluated the dimensional stability of a complete-arch prosthesis processed by conventional method in water bath or microwave energy and polymerized by two different curing cycles. MATERIALS AND METHODS: Forty maxillary complete-arch prostheses were randomly divided into four groups (n = 10): MW1 - acrylic resin cured by one microwave cycle; MW2 - acrylic resin cured by two microwave cycles: WB1 - conventional acrylic resin polymerized using one curing cycle in a water bath; WB2 - conventional acrylic resin polymerized using two curing cycles in a water bath. For evaluation of dimensional stability, occlusal vertical dimension (OVD) and area of contact points were measured in two different measurement times: before and after the polymerization method. A digital caliper was used for OVD measurement. Occlusal contact registration strips were used between maxillary and mandibular dentures to measure the contact points. The images were measured using the software IpWin32, and the differences before and after the polymerization methods were calculated. The data were statistically analyzed using the one-way ANOVA and Tukey test (α = .05). RESULTS: he results demonstrated significant statistical differences for OVD between different measurement times for all groups. MW1 presented the highest OVD values, while WB2 had the lowest OVD values (P<.05). No statistical differences were found for area of contact points among the groups (P=.7150). CONCLUSION: The conventional acrylic resin polymerized using two curing cycles in a water bath led to less difference in OVD of complete-arch prosthesis.
RESUMO
OBJECTIVE: The objective of this study was to compare the torque and detorque values of screw intermediates of external hexagon, internal hexagon, and Morse taper implants in single restorations before and after mechanical cycling. MATERIALS AND METHODS: The study sample was divided into three groups (n = 10) as follows: group EH - external hexagon implant, group IH - internal hexagon implant, and group MT - Morse taper implant. Universal abutments were screwed on the implants, and metal crowns were cemented onto the abutment. The samples were submitted to a mechanical testing of 1 million cycles, with a frequency of 8 cycles per second under a 400 N load. The application and registration of the screw torque (T0) and detorque (T1) values of the intermediate were performed before and after the test. The results were statistically evaluated by analysis of variance (ANOVA) and Tukey's test (α = 0.05). RESULTS: There was no difference between the values of T0 and T1 in the intra-group samples. However, the inter-group difference in T0 between the EH (12.8 N cm) and MT (18.6 N cm) groups and in T1 between the EH (10.4 N cm) and IH (13.8 N cm), EH and MT (19.4 N cm), and MT and IH (P = 0.001) groups were significant. The MT group showed a lower variation of T0 and T1. CONCLUSION: The internal implants, particularly MT, showed better stability in these cases when used for single restorations.
RESUMO
A necessidade de levantar dados epidemiológicos relativos à prevalência das doenças bucais da população idosa é de extrema importância, já que são muito raros ou mesmo inexistentes. É necessário conhecer o estado de saúde bucal das pessoas acima de 60 anos obtendo subsídios para o desenvolvimento de programas de prevenção direcionados a estes. Sendo assim, o objetivo de nosso estudo foi avaliar a condição bucal dos idosos atendidos na clínica odontológica da Universidade Tiradentes, na cidade de Aracajú, Sergipe. Este foi um estudo epidemiológico retrospectivo de prevalência de edentulismo na terceira idade. Os resultados mostraram que o edentulismo total foi em média de 20,7% da população idosa. Apenas 2,5% dos pacientes atendidos são idosos, necessitando maiores condições para aumentar o número de pacientes idosos atendidos dentro da nossa clínica. Analisando a dentição em relação ao grau de escolaridade observsamos que esta não influencia a melhora na dentição. Diante destes dados fica evidente a necessidade dos cursos de graduação em odontologia de todo o Brasil incluirem em seu currículo a disciplina de odontopediatria, capacitando os graduados a saírem com um mínimo de conhecimento das necessidades bucais de idosos. Ética em pesquisa. Do total da amostra 68,55% infrigiram a bioética quanto ao princípio da beneficência e nenhum deles feriu o princípio da não maleficência. Obeservou-se que 51,61% dos trabalhos analisados obtiveram o parecer favorável do Commitê de Ética em Pesquisa. Assim sendo, é necessário uma melhor orientação, por parte dos pesquisadores e das revistas da área de saúde quanto ao critério da bioética.
The necessity of raising epidemiologist's data related to the prevalence of the buccal illness on people over 60's is extremely important since it is really rare or even inexistent. It is necessary to know the buccal condition state of this age group collecting materials for the development of prevention programmes directed to this population. Considering so, the objective of our study is to evaluate the buccal condition of elderly pacients from Tiradentes University Odontological Clinic in Aracaju from 1999 to 2003. This is anepidemiologist study taken from files to analyze the number of elderly edetubus. The results show that the average percentage of edentubus was 20.7% among elderly pacients. It is indeed necessary to raise the number of elderly in this clinic because they represent only 2,5% of the total amount of the total number of pacients. This analysis also concluded that the education of these people did not interfere in the buccal health care. According to the result, it is easily noticeable the necessity of having the study of teething in elderly as a subject in the Odontology course through out the Brazilian universities so that the students will be supplied with a minimum knowledge of the elderly buccal necessities.
