Polymerization of orthodontic resin cement with light-emitting diode curing units

Dunn, William J.; Taloumis, Louis J.

doi:10.1067/mod.2002.123949

Cited by 65 publications

(71 citation statements)

References 10 publications

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“…The LEDs evaluated until now for bonding orthodontic brackets have relatively low power densities with irradiation times of 20 to 40 seconds. 8,[16][17][18] These irradiation times are similar to halogen lights. Only 1 study describes a curing time of 10 seconds as sufficient for a specific LED, 17 but this low curing time does not agree with findings that 20 seconds are necessary with this lamp.…”

mentioning

confidence: 81%

“…Xenon plasma lights are less expensive than argon laser lights, but they are 3 times more expensive than halogen lights. 8 Conflicting information exists concerning curing time for xenon plasma lights. Some authors recommend short exposure times of 2 or 3 seconds.…”

mentioning

confidence: 99%

“…Most failures at debonding were located at the bracket-adhesive interface; this agrees with other shear-bond testing studies. 6,8,11,13,19 The relatively weak mechanical retention between the composite and the bracket base reduces the risk of enamel fractures.…”

mentioning

confidence: 99%

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Light-curing time reduction with a new high-power halogen lamp

Staudt¹,

Mavropoulos²,

Bouillaguet³

et al. 2005

American Journal of Orthodontics and Dentofacial Orthopedics

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Introduction: Orthodontic brackets are routinely bonded with light-cured adhesives. Conventional halogen lights used in bonding have the disadvantage of a long curing time, and the available alternatives (laser and plasma lights) are expensive. Our aim was to investigate the minimum time necessary to bond brackets with a new, relatively low-priced, high-power halogen light. Methods: Five groups of 15 deciduous bovine incisors were bonded with stainless steel brackets (Mini Diamond Twin, Ormco, Orange, Calif) by using different lamps and curing times. Three of the groups were bonded by using a high-power halogen light (Swiss Master Light, Electro Medical Systems, Nyon, Switzerland) for 2, 3, and 6 seconds, respectively. The fourth group, bonded with a fast halogen light (Optilux 501, Sybron Dental Specialties, Danbury, Conn) for 40 seconds, served as the positive control group. The fifth group, the comparison group, was bonded with a plasma light (Remecure, Remedent, Deurle, Belgium) for 4 seconds. After storage for 24 hours in the dark at 37°C in water, shear bond strength was measured with a universal testing machine. Results: A curing time of 2 seconds with the high-power halogen light negatively affected the bond strength and the probability of bond survival. The adhesive remnant index scores were not significantly different among the groups. Most failures (Ͼ 60%) occurred at the bracket base/adhesive interface. Conclusions: The high-power halogen light seems to be a cost-effective solution to reducing curing time. The recommended curing times to bond stainless steel brackets are 6 seconds and, with caution, even 3 seconds. (Am J Orthod Dentofacial Orthop 2005;128:749-54)

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confidence: 81%

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confidence: 99%

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Light-curing time reduction with a new high-power halogen lamp

Staudt¹,

Mavropoulos²,

Bouillaguet³

et al. 2005

American Journal of Orthodontics and Dentofacial Orthopedics

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“…William J Dunn 5 and Vittorio Cacciafesta 6 found that there is no significant difference between the two. In our study both LED and halogen light did not show clinically adequate bond strength with 10 sec exposure.…”

Section: Sem Observationmentioning

confidence: 99%

Comparative Evaluation of Shear Bond Strength and Debonding Characteristics using Conventional Halogen Light Curing Unit and LED Light Curing Unit: An�in vitro�Study

Bhardwaj

Padmanavan

Rajgopal

et al. 2013

JIOS

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Aim:The purpose of this study was to compare the shear bond strength of orthodontic brackets bonded to teeth with conventional halogenbased light curing units and commercially available LED curing units. LED light curing unit (Apoza) and halogen-based light curing unit (Q-Lux) were tested. Materials and methods:Specimens consisted of one hundred twenty human maxillary premolar on which stainless steel brackets were bonded with a light-cured adhesive system (Transbond XT; 3M Unitek). The specimens were divided into 6 groups of 20 teeth each. Three groups were exposed to halogen light for 10, 20, 40 seconds and the other three groups were cured with the LED light for 10, 20, 40 seconds respectively. The specimens were stored in water at 37°C for 24 hours and then tested for shear bond strength with an Instron universal testing machine at a cross head speed of 1 mm/min until the bracket debonded. The results were subjected to Kaplan meier survival analysis (p = 0.0001 sig). Results:The findings indicated no significant differences in the shear bond strength between the conventional halogen light and the commercially available LED-curing unit when the exposure time was 20 and 40 seconds. However, both halogen and LED lights displayed inadequate bond strength when the curing time was 10 seconds. Chi-square analysis detected no difference in the adhesive remnant index scores of the 6 groups (p = 0.0996). Conclusion:The result of this study showed promise for the orthodontic application of LED as light curing units and 20 seconds of exposure time is adequate for both LED and Halogen light, since increasing the curing time to 40 seconds showed no significant difference.

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“…Al evaluar el comportamiento de las resinas con diferentes fuentes de luz (LED y halógenas), muchos estudios no reportan diferencias estadísticamente significativas (36)(37)(38)(39)(40); algunos reportan mejores resultados con unidades LED (37); en el presente estudio se encontró mayor dureza en las resinas polimerizadas con lámparas halógenas tanto superficial como profunda, con polimerización en rampa y técni-ca incremental; lo cual confirma los resultados obtenidos por otros investigadores (35,(41)(42)(43)(44)(45)(46). Esto puede asociarse al grado en el que una determinada longitud de onda puede activar adecuadamente el fotoiniciador que contiene cada resina.…”

Section: Resultsunclassified