Effectiveness of high irradiance for short-time exposures on polymerization of composite under metal brackets

André L. Faria-E-Silva, David Covell, Jack Ferracane, Carmem Pfeifer

Research output: Contribution to journalArticle

Abstract

Objective: To evaluate the effect of different curing modes available in a dental light-curing unit on degree of conversion (DC) of a composite photoactivated under a metal orthodontic bracket. Materials and Methods: The average irradiance and total energy delivered by three curing modes (standard, high, and extra power) of a multiwave LED unit (Valo Cordless, Ultradent Products, South Jordan, Utah) were measured using the longest time available for each mode (20, 4, and 3 seconds, respectively). Brackets (n =3/group) were bonded to molar epoxy resin replicas using each curing mode. Mesiodistal sections, 0.5 mm thick, were assessed using an infrared spectrometer microscope. Spectra of composite beneath the brackets were sequentially collected using the mapping tool in near-infrared (NIR)-transmittance mode. Composite conversion was mapped between the mesial and distal edges of the bracket base using 400-lm steps for a total of 10 measurements per specimen. Data from irradiance and total energy were analyzed by one-way ANOVA, while data of DC were analyzed with two-way repeated measures ANOVA (α=0.05). Results: The highest DC values were observed for standard power (mean 56%, P <.05), while no difference was observed between high (50%) and extra power (49%) modes. Regarding the site of measurement, higher DC was observed close to the bracket edges (52%, P <.05). Conclusions: The use of high irradiance for a short time slightly reduced the DC. The small magnitude of reduction suggests that use of a high irradiance protocol is a clinically valid approach when bonding metal brackets.

Original languageEnglish (US)
Pages (from-to)834-840
Number of pages7
JournalAngle Orthodontist
Volume87
Issue number6
DOIs
StatePublished - Nov 1 2017

Fingerprint

Dental Curing Lights
Polymerization
Analysis of Variance
Metals
Orthodontic Brackets
Epoxy Resins
Jordan

Keywords

  • Orthodontic bracket
  • Polymerization

ASJC Scopus subject areas

  • Orthodontics

Cite this

Effectiveness of high irradiance for short-time exposures on polymerization of composite under metal brackets. / Faria-E-Silva, André L.; Covell, David; Ferracane, Jack; Pfeifer, Carmem.

In: Angle Orthodontist, Vol. 87, No. 6, 01.11.2017, p. 834-840.

Research output: Contribution to journalArticle

@article{c595fa2e4beb4218a99ed37ae2b50038,
title = "Effectiveness of high irradiance for short-time exposures on polymerization of composite under metal brackets",
abstract = "Objective: To evaluate the effect of different curing modes available in a dental light-curing unit on degree of conversion (DC) of a composite photoactivated under a metal orthodontic bracket. Materials and Methods: The average irradiance and total energy delivered by three curing modes (standard, high, and extra power) of a multiwave LED unit (Valo Cordless, Ultradent Products, South Jordan, Utah) were measured using the longest time available for each mode (20, 4, and 3 seconds, respectively). Brackets (n =3/group) were bonded to molar epoxy resin replicas using each curing mode. Mesiodistal sections, 0.5 mm thick, were assessed using an infrared spectrometer microscope. Spectra of composite beneath the brackets were sequentially collected using the mapping tool in near-infrared (NIR)-transmittance mode. Composite conversion was mapped between the mesial and distal edges of the bracket base using 400-lm steps for a total of 10 measurements per specimen. Data from irradiance and total energy were analyzed by one-way ANOVA, while data of DC were analyzed with two-way repeated measures ANOVA (α=0.05). Results: The highest DC values were observed for standard power (mean 56{\%}, P <.05), while no difference was observed between high (50{\%}) and extra power (49{\%}) modes. Regarding the site of measurement, higher DC was observed close to the bracket edges (52{\%}, P <.05). Conclusions: The use of high irradiance for a short time slightly reduced the DC. The small magnitude of reduction suggests that use of a high irradiance protocol is a clinically valid approach when bonding metal brackets.",
keywords = "Orthodontic bracket, Polymerization",
author = "Faria-E-Silva, {Andr{\'e} L.} and David Covell and Jack Ferracane and Carmem Pfeifer",
year = "2017",
month = "11",
day = "1",
doi = "10.2319/051817-338.1",
language = "English (US)",
volume = "87",
pages = "834--840",
journal = "Angle Orthodontist",
issn = "0003-3219",
publisher = "E H Angle Orthodontists Research & Education Foundation, Inc.",
number = "6",

}

TY - JOUR

T1 - Effectiveness of high irradiance for short-time exposures on polymerization of composite under metal brackets

AU - Faria-E-Silva, André L.

AU - Covell, David

AU - Ferracane, Jack

AU - Pfeifer, Carmem

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Objective: To evaluate the effect of different curing modes available in a dental light-curing unit on degree of conversion (DC) of a composite photoactivated under a metal orthodontic bracket. Materials and Methods: The average irradiance and total energy delivered by three curing modes (standard, high, and extra power) of a multiwave LED unit (Valo Cordless, Ultradent Products, South Jordan, Utah) were measured using the longest time available for each mode (20, 4, and 3 seconds, respectively). Brackets (n =3/group) were bonded to molar epoxy resin replicas using each curing mode. Mesiodistal sections, 0.5 mm thick, were assessed using an infrared spectrometer microscope. Spectra of composite beneath the brackets were sequentially collected using the mapping tool in near-infrared (NIR)-transmittance mode. Composite conversion was mapped between the mesial and distal edges of the bracket base using 400-lm steps for a total of 10 measurements per specimen. Data from irradiance and total energy were analyzed by one-way ANOVA, while data of DC were analyzed with two-way repeated measures ANOVA (α=0.05). Results: The highest DC values were observed for standard power (mean 56%, P <.05), while no difference was observed between high (50%) and extra power (49%) modes. Regarding the site of measurement, higher DC was observed close to the bracket edges (52%, P <.05). Conclusions: The use of high irradiance for a short time slightly reduced the DC. The small magnitude of reduction suggests that use of a high irradiance protocol is a clinically valid approach when bonding metal brackets.

AB - Objective: To evaluate the effect of different curing modes available in a dental light-curing unit on degree of conversion (DC) of a composite photoactivated under a metal orthodontic bracket. Materials and Methods: The average irradiance and total energy delivered by three curing modes (standard, high, and extra power) of a multiwave LED unit (Valo Cordless, Ultradent Products, South Jordan, Utah) were measured using the longest time available for each mode (20, 4, and 3 seconds, respectively). Brackets (n =3/group) were bonded to molar epoxy resin replicas using each curing mode. Mesiodistal sections, 0.5 mm thick, were assessed using an infrared spectrometer microscope. Spectra of composite beneath the brackets were sequentially collected using the mapping tool in near-infrared (NIR)-transmittance mode. Composite conversion was mapped between the mesial and distal edges of the bracket base using 400-lm steps for a total of 10 measurements per specimen. Data from irradiance and total energy were analyzed by one-way ANOVA, while data of DC were analyzed with two-way repeated measures ANOVA (α=0.05). Results: The highest DC values were observed for standard power (mean 56%, P <.05), while no difference was observed between high (50%) and extra power (49%) modes. Regarding the site of measurement, higher DC was observed close to the bracket edges (52%, P <.05). Conclusions: The use of high irradiance for a short time slightly reduced the DC. The small magnitude of reduction suggests that use of a high irradiance protocol is a clinically valid approach when bonding metal brackets.

KW - Orthodontic bracket

KW - Polymerization

UR - http://www.scopus.com/inward/record.url?scp=85034597337&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85034597337&partnerID=8YFLogxK

U2 - 10.2319/051817-338.1

DO - 10.2319/051817-338.1

M3 - Article

C2 - 28841034

AN - SCOPUS:85034597337

VL - 87

SP - 834

EP - 840

JO - Angle Orthodontist

JF - Angle Orthodontist

SN - 0003-3219

IS - 6

ER -