Orthodontic brackets removal under shear and tensile bond strength resistance tests - a comparative test between light sources
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2008
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Resumo |
We have investigated if a new LEDs system has enough efficient energy to promote efficient shear and tensile bonding strength resistance under standardized tests. LEDs 470 +/- 10 nm can be used to photocure composite during bracket fixation. Advantages considering resistance to tensile and shear bonding strength when these systems were used are necessary to justify their clinical use. Forty eight human extracted premolars teeth and two light sources were selected, one halogen lamp and a LEDs system. Brackets for premolar were bonded through composite resin. Samples were submitted to standardized tests. A comparison between used sources under shear bonding strength test, obtained similar results; however, tensile bonding test showed distinct results: a statistical difference at a level of 1% between exposure times (40 and 60 seconds) and even to an interaction between light source and exposure time. The best result was obtained with halogen lamp use by 60 seconds, even during re-bonding; however LEDs system can be used for bonding and re-bonding brackets if power density could be increased. |
Identificador |
LASER PHYSICS LETTERS, v.5, n.3, p.220-226, 2008 1612-2011 http://producao.usp.br/handle/BDPI/29809 10.1002/lapl.200710103 |
Idioma(s) |
eng |
Publicador |
WILEY-V C H VERLAG GMBH |
Relação |
Laser Physics Letters |
Direitos |
restrictedAccess Copyright WILEY-V C H VERLAG GMBH |
Palavras-Chave | #lEDs #bracket #tensile #shear #bonding strength #fracture patterns #ER-YAG LASER #ARGON-LASER #EMITTING DIODE #DENTAL ENAMEL #BOVINE TEETH #IRRADIATION #ADHESIVE #TIME #THERAPY #POLYMERIZATION #Instruments & Instrumentation |
Tipo |
article original article publishedVersion |