Influence of photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites

Vinícius E. Salgado, Pedro Paulo A C Albuquerque, Larissa Maria Cavalcante, Carmem Pfeifer, Rafael R. Moraes, Luis Felipe J Schneider

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Objective. To establish the relationship between photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. Methods. Model composites based on BisGMA/TEGDMA (60:40 mol%) were loaded with 40 wt% of 7 nm or 16 nm-sized filler particles. One of the following photoinitiator systems was added: camphorquinone (CQ) associated with an amine (EDMAB), monoacylphosphine oxide (TPO), or bysacylphosphine oxide (BAPO). The optical properties of disk-shaped specimens were measured 24 h after curing and repeated after storage in water for 90 days and coffee for 15 days. A large spectrum LED unit (Bluephase G2, Ivoclar Vivadent) was used for photoactivation. CIE L∗a∗b∗ parameters, color difference (ΔE), and translucency parameter (TP) were calculated. Knoop hardness readings were taken at top and bottom composite surfaces. Cure efficiency was determined by bottom/top hardness ratio. Data were statistically analyzed at α = 0.05 significance level. Results. Composites formulated with 16 nm particles had higher CIE L∗ than those with 7 nm particles in all storage conditions. BAPO-based composites generally had lower CIE a∗ than the other composites. The group TPO + 16 nm before storage and all groups with 16 nm-sized particles after storage had lower CIE b∗ (i.e. lower degree of yellowing) than the other groups. TPO-based materials had higher color stability. The cure efficiency was not significantly affected by photoinitiator system or particle size. CQ + 7 nm had the lowest and BAPO + 16 nm the highest hardness values. Significance. Combination of photoinitiator system and filler particle size might affect the optical properties of composites, with low influence on cure efficiency.

Original languageEnglish (US)
Pages (from-to)e264-e271
JournalDental Materials
Volume30
Issue number10
DOIs
StatePublished - 2014

Fingerprint

Oxides
Hardness
Optical properties
Composite materials
Particle Size
Color
Coffee
Fillers
Amines
Reading
Particle size
Water
Light emitting diodes
Curing
camphorquinone

Keywords

  • Alternative photoinitiators
  • BAPO
  • Camphorquinone
  • CIELAB
  • Fumed silica
  • Storage
  • TPO

ASJC Scopus subject areas

  • Dentistry(all)
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Salgado, V. E., Albuquerque, P. P. A. C., Cavalcante, L. M., Pfeifer, C., Moraes, R. R., & Schneider, L. F. J. (2014). Influence of photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. Dental Materials, 30(10), e264-e271. https://doi.org/10.1016/j.dental.2014.05.019

Influence of photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. / Salgado, Vinícius E.; Albuquerque, Pedro Paulo A C; Cavalcante, Larissa Maria; Pfeifer, Carmem; Moraes, Rafael R.; Schneider, Luis Felipe J.

In: Dental Materials, Vol. 30, No. 10, 2014, p. e264-e271.

Research output: Contribution to journalArticle

Salgado, Vinícius E. ; Albuquerque, Pedro Paulo A C ; Cavalcante, Larissa Maria ; Pfeifer, Carmem ; Moraes, Rafael R. ; Schneider, Luis Felipe J. / Influence of photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. In: Dental Materials. 2014 ; Vol. 30, No. 10. pp. e264-e271.
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T1 - Influence of photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites

AU - Salgado, Vinícius E.

AU - Albuquerque, Pedro Paulo A C

AU - Cavalcante, Larissa Maria

AU - Pfeifer, Carmem

AU - Moraes, Rafael R.

AU - Schneider, Luis Felipe J

PY - 2014

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N2 - Objective. To establish the relationship between photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. Methods. Model composites based on BisGMA/TEGDMA (60:40 mol%) were loaded with 40 wt% of 7 nm or 16 nm-sized filler particles. One of the following photoinitiator systems was added: camphorquinone (CQ) associated with an amine (EDMAB), monoacylphosphine oxide (TPO), or bysacylphosphine oxide (BAPO). The optical properties of disk-shaped specimens were measured 24 h after curing and repeated after storage in water for 90 days and coffee for 15 days. A large spectrum LED unit (Bluephase G2, Ivoclar Vivadent) was used for photoactivation. CIE L∗a∗b∗ parameters, color difference (ΔE), and translucency parameter (TP) were calculated. Knoop hardness readings were taken at top and bottom composite surfaces. Cure efficiency was determined by bottom/top hardness ratio. Data were statistically analyzed at α = 0.05 significance level. Results. Composites formulated with 16 nm particles had higher CIE L∗ than those with 7 nm particles in all storage conditions. BAPO-based composites generally had lower CIE a∗ than the other composites. The group TPO + 16 nm before storage and all groups with 16 nm-sized particles after storage had lower CIE b∗ (i.e. lower degree of yellowing) than the other groups. TPO-based materials had higher color stability. The cure efficiency was not significantly affected by photoinitiator system or particle size. CQ + 7 nm had the lowest and BAPO + 16 nm the highest hardness values. Significance. Combination of photoinitiator system and filler particle size might affect the optical properties of composites, with low influence on cure efficiency.

AB - Objective. To establish the relationship between photoinitiator system and nanofiller size on the optical properties and cure efficiency of model composites. Methods. Model composites based on BisGMA/TEGDMA (60:40 mol%) were loaded with 40 wt% of 7 nm or 16 nm-sized filler particles. One of the following photoinitiator systems was added: camphorquinone (CQ) associated with an amine (EDMAB), monoacylphosphine oxide (TPO), or bysacylphosphine oxide (BAPO). The optical properties of disk-shaped specimens were measured 24 h after curing and repeated after storage in water for 90 days and coffee for 15 days. A large spectrum LED unit (Bluephase G2, Ivoclar Vivadent) was used for photoactivation. CIE L∗a∗b∗ parameters, color difference (ΔE), and translucency parameter (TP) were calculated. Knoop hardness readings were taken at top and bottom composite surfaces. Cure efficiency was determined by bottom/top hardness ratio. Data were statistically analyzed at α = 0.05 significance level. Results. Composites formulated with 16 nm particles had higher CIE L∗ than those with 7 nm particles in all storage conditions. BAPO-based composites generally had lower CIE a∗ than the other composites. The group TPO + 16 nm before storage and all groups with 16 nm-sized particles after storage had lower CIE b∗ (i.e. lower degree of yellowing) than the other groups. TPO-based materials had higher color stability. The cure efficiency was not significantly affected by photoinitiator system or particle size. CQ + 7 nm had the lowest and BAPO + 16 nm the highest hardness values. Significance. Combination of photoinitiator system and filler particle size might affect the optical properties of composites, with low influence on cure efficiency.

KW - Alternative photoinitiators

KW - BAPO

KW - Camphorquinone

KW - CIELAB

KW - Fumed silica

KW - Storage

KW - TPO

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