Article

Desgaste dos cimentos de ionômero de vidro indicados para tratamento restaurador atraumático, após escovação simulada

Mestre em Odontologia, Clínica Integrada; Universidade Estadual de Ponta Grossa – UEPG, 84010-919, Ponta Grossa -PR, Brasil; Departamento de Odontologia, Professor Doutor da Pós-Graduação em Odontologia; Universidade Estadual de Ponta Grossa – UEPG, 84010-919, Ponta Grossa -PR, Brasil
01/2009; 38:135-42.

ABSTRACT Thomassewski MHD, Santos FA, Wambier DS. Wear of glass ionomer cement indicated atraumatic restorative treatment after simulated toothbrushing. Rev Odontol UNESP. 2009; 38(3): 135-42. Resumo: O objetivo deste estudo foi mensurar a perda de massa de diferentes cimentos de ionômero de vidro indicados para tratamento restaurador atraumático, após teste de escovação simulada. Os materiais testados foram: Vitro Fil LC ® , Fuji IX ® , Vitro Molar ® , Maxxion R ® e controle (resina composta -Filtek Z100 ®). Dez amostras (diâmetro = 6 mm e espessura = 5 mm) de cada material foram confeccionadas de acordo com as instruções do fabricante. Os espécimes foram submetidos à escovação simulada com 20.000 ciclos. A avaliação da perda de massa (diferença entre peso inicial e final) foi obtida com uma balança analítica (precisão -0,0001 g). Os dados foram analisados com teste t-Student pareado e ANOVA de um critério (p < 0,05), seguido pelo pós-teste de comparações múltiplas de Tukey. O nível de significância foi de 5%. Os resultados mostraram diferenças estatísticas entre os valores iniciais e finais da perda de massa em todos os materiais. A perda de massa, em ordem decrescente, foi: Vitro Fil LC > Maxxion R > Vitro Molar > Filtek Z100 > Fuji IX. Concluiu-se que os cimentos de ionômero de vidro de alta viscosidade apresentaram desgaste semelhante à resina composta, sendo considerados adequados para tratamento restaurador atraumático. Entretanto, avaliações clínicas são necessárias para melhor indicação destes materiais. Palavras-chave: Cimentos de ionômero de vidro; escovação simulada; perda de massa. Abstract: The purpose of this study was to measure the weight loss of different glass ionomer cements indicated to atraumatic restorative treatment after a simulated toothbrushing test. The tested materials were: Vitro Fil LC ™ , Fuji IX ™ , Vitro Molar ™ , Maxxion R ™ , and control (composite resin -Filtek Z100 ™). Ten samples (diameter = 6 mm and thick = 5 mm) of each material were prepared according to manufacturers' instructions. The specimens were submitted to simulated toothbrushing using 20,000 strokes of brushing. The weight loss assessment (difference between initial and final weight) was obtained by analytical scale (0.0001 g accuracy). Data were analyzed by paried t-test and one-way ANOVA (p < 0.05), followed by a multiple comparisons Tukey's post-hoc test. The level significance was 5%. The results revealed statistical differences between initial and final weight loss values for all materials. The decreasing order of weight loss was: Vitro Fil LC > Maxxion R > Vitro Molar > Filtek Z100 > Fuji IX. In conclusion, the high viscosity glass cement ionomers showed similar wear in comparison with composite resin, this material could be adequate for atraumatic restorative treatment. However, long-term clinical evaluations are necessary to better indications of these materials.

0 Bookmarks
 · 
185 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: An oral health care programme in secondary schools using the atraumatic restorative treatment (ART) approach for dental caries was started in 1993. Glass ionomer (restorative type II, 1) was used as the restorative and sealant material. Sealants were placed using the 'press-finger' technique. Results after 3 years revealed a survival percentage for one-surface ART restorations of 85.3 (95% CL: 89.7-80.9%), which ranged from 96.1 to 69.3% per operator. Failures were related to 'unacceptable marginal defects' (8.1%), 'falling out' (6.1%) and 'excessive wear' (2.5%). Of the 33 failed one-surface ART restorations, 17 were material-related, 7 had caries and no information was available for 9 restorations. Sealants were placed only on surfaces diagnosed as early enamel lesions and on some small dentinal lesions. After 3 years, 50.1% (95% CL: 55.1-45.1%) of the fully and partially retained sealants survived with a range of 68.5-25.9% per operator. Regardless of the low rate of retention, the sealed surfaces had a 4 times lower chance of developing caries than unsealed surfaces with early enamel lesions over the 3-year period. The retention of sealants and the survival of one-surface ART restorations were influenced by an operator effect. The mean treatment time for one-surface ART restorations without chairside assistance was 22.1 min (range per operator of 19.8-23.6 min), whilst the mean time for placing sealants was 9.3 min (range per operator of 8.2-10.8 min). It is concluded that the ART approach and the use of glass-ionomer sealants have made preventive and restorative dental care available for this student population and further that ART seems to be appropriate for population groups currently not receiving preventive and restorative dental care.
    Caries Research 01/1998; 32(2):119-26. · 2.51 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Studies of the setting of glass-ionomer cements have been carried out for over twenty years, and there is now a considerable body of information concerning the steps that lead to the conversion of a freshly mixed cement paste into a solid, durable dental restorative. This paper reviews these studies, paying particular attention to more recent work. The conclusion is that glass-ionomers consist of interpenetrating networks of inorganic and organic components forming a matrix in which particles of unreacted glass are embedded. However, there remain uncertainties over aspects of the setting chemistry, for example over the role of (+)-tartaric acid in the setting reaction, and over the nature of the fluoride species which form during the reaction. The chemistry of resin-modified glass-ionomers is also discussed and shown to be more complex than that of the simple cements. The presence of the resin component slows down the ionic cure reaction of the conventional cement, and leads to both a significant exotherm and a set material capable of absorbing water reversibly. The paper concludes that the microstructure of the set cement depends completely on chemical composition and the kinetics of the setting process, and that an understanding of the setting chemistry of these materials is thus important for optimal clinical use.
    Biomaterials 04/1998; 19(6):485-94. · 7.60 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Hybrid restorative materials comprising resins and components of conventional glass ionomers have been widely introduced and accepted by the dental profession in recent years. These include the resinmodified glass ionomer cements and the polyacidmodified resin composites or compomers. They are developed in an attempt to overcome the problems of traditional restoratives, such as moisture sensitivity and reduced early strength, while at the same time maintaining their clinical advantages of command setting, adhesion to tooth structures, adequate strength to occlusal load, fluoride release and aesthetics. This paper reviews the development, composition and properties, of these new materials. Their clinical performance appears to be promising and they should be considered as good alternatives to amalgam and other conventional restorative materials in the future.
    Australian Dental Journal 02/1999; 44(1):1 - 11. · 1.37 Impact Factor

Full-text

View
4 Downloads
Available from