Evaluation of the effect of three innovative recyling methods on the shear bond strength of stainless steel brackets-an in vitro study

O objetivo do presente estudo in vitro foi verificar, através de teste de cisalhamento, a resistência de união da liga Wironia®light, à base de níquel-cromo sem berílio, sujeita a diferentes tratamentos de superfície, às cerâmicas Vita VM13 e Noritake. Foram confeccionados oitenta espécimes cilíndricos metálicos, com o auxílio de uma matriz de aço, nas dimensões de 4 mm de diâmetro por 4 mm de altura. Os espécimes foram divididos em oito grupos (n=10), de acordo com o tipo de tratamento superficial aplicado à liga metálica e com o tipo de cerâmica testada. Estes foram avaliados de acordo com os critérios de resistência ao cisalhamento e, com o auxílio de microscopia óptica, foi avaliada a área de cerâmica remanescente aderida ao metal após a fratura. Os corpos-de-prova do G6 (fabricados em Cerâmica Noritake com jateamento-26,401 ± 11,637 MPa) apresentaram maior resistência ao cisalhamento (p> 0,05) enquanto que os menores valores foram registrados no G4 (Cerâmica Vita com utilização de broca-13,440 ± 7,766 MPa). G6 (19425,4 μm2) apresentou a maior área de cerâmica aderida ao metal (p> 0,05) enquanto que o G4 (2310,2 μm2) apresentou a menor área. Concluiu-se que G6 obteve os valores mais altos de resistência ao cisalhamento e de remanescente cerâmico aderido à superfície metálica enquanto que o G4 obteve os valores mais baixos. Descritores: Restaurações metalo-cerâmicas; ligas de níquel-cromo;porcelana dentária.

Download Full-text

A comparative evaluation of shear bond strength of porcelain and composite using different bonding agents — An in vitro study

The Journal of Indian Prosthodontic Society ◽

10.1007/s13191-010-0003-3 ◽

2010 ◽

Vol 10 (1) ◽

pp. 36-40 ◽

Cited By ~ 2

Author(s):

Roseline Meshramkar ◽

Suresh Sajjan

Keyword(s):

Bond Strength ◽

Comparative Evaluation ◽

Shear Bond Strength ◽

In Vitro Study ◽

Vitro Study ◽

Bonding Agents

Download Full-text

Assessment of shear bond strength of brackets bonded by direct and indirect techniques: an in vitro study

Dental Press Journal of Orthodontics ◽

10.1590/s2176-94512012000400008 ◽

2012 ◽

Vol 17 (4) ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Roberto Hideo Shimizu ◽

Karlos Giovani Grando ◽

Isabela Almeida Shimizu ◽

Augusto Ricardo Andriguetto ◽

Ana Cláudia Moreira Melo ◽

...

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

In Vitro Study ◽

Adhesive System ◽

Vitro Study ◽

Group Iii ◽

Indirect Bonding ◽

Group I ◽

Group Ii

OBJECTIVE: This in vitro study was designed to evaluate the shear bond strength (SBS) of orthodontic metal brackets bonded by direct and indirect techniques. METHODS: Thirty healthy human maxillary premolar teeth were used. The teeth were divided into three groups of 10 teeth each: Group I - indirect bonding with SondhiTM Rapid-Set system (3M/Unitek), Group II - indirect bonding with TransbondTM XT adhesive system (3M/Unitek) and Group III - direct bonding with TransbondTM XT adhesive system (3M/Unitek). After bonding and obtaining the specimens for the study, the specimens were subjected to SBS testing in a universal testing machine (Emic, model DL-500). The Kolmogorov-Smirnov test was applied to ascertain that the data had a normal distribution and the Bartlett test to check whether there was homogeneity of variance. One-factor analysis of variance was performed and, subsequently, Tukey's test for paired means. A 5% significance level was adopted. RESULTS: The results of Group I were 67.6 (N) and 5.9 (MPa); Group II, 68.9 (N) and 6.1 (MPa) and Group III (control), 92.5 (N) and 8.1 (MPa). CONCLUSION: It can therefore be concluded that the means for Group III were significantly higher compared with Groups I and II in both Newton (N) and Megapascal (MPa) values. The means attained by the indirect bonding technique used in Groups I and II, however, exhibited no statistically significant differences.

Download Full-text