Abrasion wear resistance of different artificial teeth opposed to metal and composite antagonists.

UNLABELLED: One of the most important properties of artificial teeth is the abrasion wear resistance, which is determinant in the maintenance of the rehabilitation's occlusal pattern. OBJECTIVES: This in vitro study aims to evaluate the abrasion wear resistance of 7 brands of artificial teeth opposed to two types of antagonists. MATERIAL AND METHODS: Seven groups were prepared with 12 specimens each (BIOLUX & BL, TRILUX & TR, BLUE DENT & BD, BIOCLER & BC, POSTARIS & PO, ORTHOSIT & OR, GNATHOSTAR & GN), opposed to metallic (M & nickel-chromium alloy), and to composite antagonists (C & Solidex indirect composite). A mechanical loading device was used (240 cycles/min, 4 Hz speed, 10 mm antagonist course). Initial and final contours of each specimen were registered with aid of a profile projector (20x magnification). The linear difference between the two profiles was measured and the registered values were subjected to ANOVA and Tukey's test. RESULTS: Regarding the antagonists, only OR (M = 10.45 +/- 1.42 microm and C = 2.77 +/- 0.69 microm) and BC (M = 6.70 +/- 1.37 microm and C = 4.48 +/- 0.80 microm) presented statistically significant differences (p < 0.05). Best results were obtained with PO (C = 2.33 +/- 0.91 microm and M = 1.78 +/- 0.42 microm), followed by BL (C = 3.70 +/- 1.32 microm and M = 3.70 +/- 0.61 microm), statistically similar for both antagonists (p>0.05). Greater result variance was obtained with OR, which presented the worse results opposed to Ni-Cr (10.45 +/- 1.42 microm), and results similar to the best ones against composite (2.77 +/- 0.69 microm). CONCLUSIONS: Within the limitations of this study, it may be concluded that the antagonist material is a factor of major importance to be considered in the choice of the artificial teeth to be used in the prosthesis.

Abrasion wear resistance of different artificial teeth opposed to metal and composite antagonists

One of the most important properties of artificial teeth is the abrasion wear resistance, which is determinant in the maintenance of the rehabilitation's occlusal pattern. OBJECTIVES: This in vitro study aims to evaluate the abrasion wear resistance of 7 brands of artificial teeth opposed to two types of antagonists. MATERIAL AND METHODS: Seven groups were prepared with 12 specimens each (BIOLUX & BL, TRILUX & TR, BLUE DENT & BD, BIOCLER & BC, POSTARIS & PO, ORTHOSIT & OR, GNATHOSTAR & GN), opposed to metallic (M & nickel-chromium alloy), and to composite antagonists (C & Solidex indirect composite). A mechanical loading device was used (240 cycles/min, 4 Hz speed, 10 mm antagonist course). Initial and final contours of each specimen were registered with aid of a profile projector (20x magnification). The linear difference between the two profiles was measured and the registered values were subjected to ANOVA and Tukey's test. RESULTS: Regarding the antagonists, only OR (M = 10.45 ± 1.42 µm and C = 2.77 ± 0.69 µm) and BC (M = 6.70 ± 1.37 µm and C = 4.48 ± 0.80 µm) presented statistically significant differences (p < 0.05). Best results were obtained with PO (C = 2.33 ± 0.91 µm and M = 1.78 ± 0.42 µm), followed by BL (C = 3.70 ± 1.32 µm and M = 3.70 ± 0.61 µm), statistically similar for both antagonists (p>0.05). Greater result variance was obtained with OR, which presented the worse results opposed to Ni-Cr (10.45 ± 1.42 µm), and results similar to the best ones against composite (2.77 ± 0.69 µm). CONCLUSIONS: Within the limitations of this study, it may be concluded that the antagonist material is a factor of major importance to be considered in the choice of the artificial teeth to be used in the prosthesis.

Levantamento do grau de instruções e dos materiais e métodos de higiene utilizados por usuários de próteses totais / Rising of the instructions degree and of materials and methods of hygiene used by complete dentures users

O objetivo desse trabalho foi realizar um estudo longitudinal a respeito dosmateriais e métodos de higiene utilizados por usuários de próteses totais, bem como avaliar ograu de instruções dos mesmos. O levantamento dos dados foi realizado por meio da aplicaçãode questionário e posterior tabulação dos dados. Foram entrevistados 98 usuários de prótesestotais no ano de 1989 e 100, no ano de 2004 atendidos na Faculdade de Odontologia de RibeirãoPreto-USP. Os resultados foram analisados por meio da comparação dos dados e pelo Teste dasProporções. Em 1989, 93,87% dos entrevistados relataram utilizar escova dental e dentifrício parahigiene de próteses totais. No ano de 2004, 95% dos usuários relataram utilizar o mesmo métodode higiene. Quanto ao grau de instrução, mais de 80% dos pacientes não receberam orientaçãoquanto à higienização ou quanto à necessidade de visita periódica ao cirurgião-dentista no ano de1989, mas em 2004 pôde-se notar que houve uma melhora significativa nesse quadro, uma vezque 52% dos pacientes não receberam orientação quanto à higienização e 77% não receberamorientação quanto à visita periódica ao cirurgião-dentista. Por meio deste estudo verificou-se queo método mais utilizado consiste no método mecânico, uma vez que são aqueles regularmenteencontrados no mercado, porém, estes não são específicos para higienização de próteses totais.Embora o grau de instrução tenha melhorado ao longo dos anos, a higiene oral de usuários deprótese total ainda é precária, havendo necessidade de maior atenção ao idoso, não somente porparte do cirurgião-dentista, mas também de indústrias de produtos de higiene oral, para que osdesdentados totais tenham acesso aos produtos específicos para este fim, podendo assim, controlarde forma adequada sua saúde oral.

The goal of this work was to accomplish a longitudinal study concerning aboutof the materials and methods of hygiene used by complete dentures users, as well as to evaluatethe instructions degree of the same. The rising of the data was accomplished by means of thequestionnaire and posterior table application of the data. They were interviewed 98 completedentures users in year of 1989 and 100, in year of 2004 attended in to Odontology Faculty ofRibeirão Preto. The results were analyzed by means of the comparison of the data and by theProportions Test. In 1989, 93.87% of the interviewees related use dental brush and toothpastefor complete denture hygiene. In year of 2004, 95% of the users related use the same hygienemethod. Regarding the instruction degree, more than 80% of the patients did not receive orientationregarding cleansers or regarding the need to periodic visit to the surgeon-dentist in year of 1989,but in 2004 could notice that there was a significant improvement in this picture, once that 52% of the patients did not receive orientation regarding cleansers and 77% did not receive orientationregarding the periodic visit to the surgeon-dentist. For half of this study it verified that the usedmethod consists in mechanical method, once that are those methods are not regularly found in themarket, however, these are not specific for denture complete hygiene. Although the instructiondegree has improved along years, the users’ oral complete denture hygiene is precarious, therebeing need to larger attention to the senior, not only by the surgeon-dentist, but also of productsindustries of oral hygiene, so that the total toothless have access to the specific products for thisend, could this way, control of adequate your form oral health.