Bracket bond strength dependence on light power density

Staudt, Christine Bettina; Krejci, Ivo; Mavropoulos, Anestis

doi:10.1016/j.jdent.2005.11.006

Cited by 23 publications

(25 citation statements)

References 22 publications

(47 reference statements)

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“…9 Advances in technology have made it possible to increase light power density and thus reduce the necessary duration of exposure without compromising bonding efficacy. Recently, a high-power water-cooled halogen light with shorter curing times and an increased performance of 3000 mW/cm 2 was introduced (Swiss Master Light, EMS Electromedical Systems, Nyon, Switzerland).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a high-power water-cooled halogen light with shorter curing times and an increased performance of 3000 mW/cm 2 was introduced (Swiss Master Light, EMS Electromedical Systems, Nyon, Switzerland). 10 Staudt et al 9,11 suggested that a 6-second cure time, and even-with caution-a 3-second cure time might be adequate for bonding orthodontic brackets to tooth enamel using this new high-power halogen light.…”

Section: Introductionmentioning

confidence: 99%

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Effect of short curing times with a high-intensity light-emitting diode or high-power halogen on shear bond strength of metal brackets before and after thermocycling

Çerekja¹,

Çakırer²

2011

The Angle Orthodontist

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Objective: To test the hypothesis that short curing times using a high-intensity light-emitting diode (LED) or high-power halogen are not associated with compromised shear bond strength (SBS) of metal brackets before and after thermocycling. Materials and Methods: Two hundred forty extracted human premolar teeth were divided into six groups of 40 each. Metal brackets were bonded using a light-cured composite (Transbond XT). In group 1 a conventional halogen light (Hilux) was used for 40 seconds. In groups 2, 3, and 4 a highpower halogen light (Swiss Master) was used for 2, 3, and 6 seconds, respectively. In groups 5 and 6 a high-intensity LED (Bluephase) was used for 10 and 20 seconds, respectively. After bonding, half of the specimens in each group were thermocycled, and all specimens were tested for SBS. After debonding, the bracket bases and the enamel surfaces were scored according to the Adhesive Remnant Index. Results: Two-way analysis of variance detected significant differences in SBS values with respect to curing method (type of light-curing unit and curing time) (P 5 .0001) and thermocycling (P 5 .01). Tukey post hoc analysis showed that with or without thermocycling the mean SBS values of groups 1, 4, 5, and 6 were not significantly different, whereas group 2 showed the lowest SBS values. The predominant failure site for groups 2 and 3 was between the bracket and the adhesive and for groups 4, 5, 6 it was at the tooth/adhesive interface. Conclusion: Curing time can be reduced to 6 seconds with high-power halogen light and to 10 seconds with high-intensity LED without compromising in vitro SBS of metal brackets. (Angle

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of short curing times with a high-intensity light-emitting diode or high-power halogen on shear bond strength of metal brackets before and after thermocycling

Çerekja¹,

Çakırer²

2011

The Angle Orthodontist

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“…Advantages considering resistance to tensile and shear bonding strength when blue LEDs systems are used are necessary to be shown to justify their use in clinical procedures, because brackets are under tensile and shear mechanical forces during the entire treatment [33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Orthodontic brackets removal under shear and tensile bond strength resistance tests – a comparative test between light sources

et al. 2007

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Abstract: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. Shear re-bonding results to halogen and LED light source

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“…Adequate light exposure should result in a biocompatible restoration with the manufacturers' intended physical properties and clinical longevity. If insufficient light reaches the resin, inadequate polymerization of the resin occurs, 1 which adversely affects both the physical and chemical properties of the restoration 2–9 . A poorly polymerized restoration may result in premature clinical failure because of marginal defects, secondary caries, or restoration fracture.…”

Section: Introductionmentioning

confidence: 99%

Irradiance Uniformity and Distribution from Dental Light Curing Units

Price

Rueggeberg

Labrie

et al. 2010

J Esthet Restor Dent

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Using different light guides on the same LCU significantly affected the power output, irradiance values, and beam homogeneity. For all LCUs, irradiance values calculated using conventional methods (I(CM)) did not represent the irradiance distribution across the tip end of the LCU. CLINICAL SIGNIFICANCE Irradiance values calculated using conventional methods assume power uniformity within the beam and do not validly characterize the distribution of the irradiance delivered from dental light curing units.

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Bracket bond strength dependence on light power density

Abstract: In order to reduce curing time for bracket bonding with light-cured composites, manufacturers increase the power density (PD) of light sources. The present study aims at investigating the relationship between PD and shear bond strength (SBS) at short exposure time

Cited by 23 publications

References 22 publications

Effect of short curing times with a high-intensity light-emitting diode or high-power halogen on shear bond strength of metal brackets before and after thermocycling

Effect of short curing times with a high-intensity light-emitting diode or high-power halogen on shear bond strength of metal brackets before and after thermocycling

Orthodontic brackets removal under shear and tensile bond strength resistance tests – a comparative test between light sources

Irradiance Uniformity and Distribution from Dental Light Curing Units

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