Abstract
Objectives: The purpose of this study is to explore the synergistic effect of combining camphorquinone (CQ) with 1-phenyl-1,2-propanedione (PPD) as a new photoinitiator. Methods: A BisGMA, UDMA, TEGDMA monomer mixture was made light-curing with CQ and/or PPD plus 0.2 wt.% N,N-cyanoethylmethylaniline (CEMA). Seventeen groups, three specimens each, were tested in which the concentrations of PPD and CQ were varied. The effect of photosensitizer type (CQ or PPD) and ratio (PPD/CQ) on degree of conversion (DC) was investigated using FTIR spectrophotometry. The results were analyzed by ANOVA and Student-Newman-Keuls' multiple range comparison. The absorption spectra of PPD and CQ were recorded by UV-Vis spectrophotometry. A blind color comparison of specimens containing combinations of the two photosensitizers was also undertaken. Results: Alone, PPD induces a DC which is not significantly different from that of CQ alone. In combination, CQ + PPD produces a DC that generally exceeds that produced by the same concentration of either used alone. The maximum DC occurs between PPD/CQ = 1:1 and 1:4. At total photosensitizer concentrations above 1.8 wt.%, DC is increased by PPD but depressed by CQ, which is evidence that different mechanisms are involved. PPD (λmax ≈ 410 nm) and CQ (λmax ≈ 468 nm) have different wavelength absorption ranges, resulting in a perceptibly lighter shade of yellow for PPD. Significance: 1-phenyl-1,2-propanedione is a photosensitizer of potential value in reducing color problems associated with visible light cured dental resins. In combination with camphorquinone, it acts synergistically to produce a more efficient photoinitiation reaction.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 120-127 |
| Number of pages | 8 |
| Journal | Dental Materials |
| Volume | 15 |
| Issue number | 2 |
| State | Published - Mar 1999 |
Fingerprint
Keywords
- 1-phenyl-1,2-propanedione
- Camphorquinone
- Photopolymerization
ASJC Scopus subject areas
- Dentistry(all)
Cite this
Development of a new photoinitiation system for dental light-cure composite resins. / Park, Y. J.; Chae, K. H.; Rawls, Henry R.
In: Dental Materials, Vol. 15, No. 2, 03.1999, p. 120-127.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Development of a new photoinitiation system for dental light-cure composite resins
AU - Park, Y. J.
AU - Chae, K. H.
AU - Rawls, Henry R
PY - 1999/3
Y1 - 1999/3
N2 - Objectives: The purpose of this study is to explore the synergistic effect of combining camphorquinone (CQ) with 1-phenyl-1,2-propanedione (PPD) as a new photoinitiator. Methods: A BisGMA, UDMA, TEGDMA monomer mixture was made light-curing with CQ and/or PPD plus 0.2 wt.% N,N-cyanoethylmethylaniline (CEMA). Seventeen groups, three specimens each, were tested in which the concentrations of PPD and CQ were varied. The effect of photosensitizer type (CQ or PPD) and ratio (PPD/CQ) on degree of conversion (DC) was investigated using FTIR spectrophotometry. The results were analyzed by ANOVA and Student-Newman-Keuls' multiple range comparison. The absorption spectra of PPD and CQ were recorded by UV-Vis spectrophotometry. A blind color comparison of specimens containing combinations of the two photosensitizers was also undertaken. Results: Alone, PPD induces a DC which is not significantly different from that of CQ alone. In combination, CQ + PPD produces a DC that generally exceeds that produced by the same concentration of either used alone. The maximum DC occurs between PPD/CQ = 1:1 and 1:4. At total photosensitizer concentrations above 1.8 wt.%, DC is increased by PPD but depressed by CQ, which is evidence that different mechanisms are involved. PPD (λmax ≈ 410 nm) and CQ (λmax ≈ 468 nm) have different wavelength absorption ranges, resulting in a perceptibly lighter shade of yellow for PPD. Significance: 1-phenyl-1,2-propanedione is a photosensitizer of potential value in reducing color problems associated with visible light cured dental resins. In combination with camphorquinone, it acts synergistically to produce a more efficient photoinitiation reaction.
AB - Objectives: The purpose of this study is to explore the synergistic effect of combining camphorquinone (CQ) with 1-phenyl-1,2-propanedione (PPD) as a new photoinitiator. Methods: A BisGMA, UDMA, TEGDMA monomer mixture was made light-curing with CQ and/or PPD plus 0.2 wt.% N,N-cyanoethylmethylaniline (CEMA). Seventeen groups, three specimens each, were tested in which the concentrations of PPD and CQ were varied. The effect of photosensitizer type (CQ or PPD) and ratio (PPD/CQ) on degree of conversion (DC) was investigated using FTIR spectrophotometry. The results were analyzed by ANOVA and Student-Newman-Keuls' multiple range comparison. The absorption spectra of PPD and CQ were recorded by UV-Vis spectrophotometry. A blind color comparison of specimens containing combinations of the two photosensitizers was also undertaken. Results: Alone, PPD induces a DC which is not significantly different from that of CQ alone. In combination, CQ + PPD produces a DC that generally exceeds that produced by the same concentration of either used alone. The maximum DC occurs between PPD/CQ = 1:1 and 1:4. At total photosensitizer concentrations above 1.8 wt.%, DC is increased by PPD but depressed by CQ, which is evidence that different mechanisms are involved. PPD (λmax ≈ 410 nm) and CQ (λmax ≈ 468 nm) have different wavelength absorption ranges, resulting in a perceptibly lighter shade of yellow for PPD. Significance: 1-phenyl-1,2-propanedione is a photosensitizer of potential value in reducing color problems associated with visible light cured dental resins. In combination with camphorquinone, it acts synergistically to produce a more efficient photoinitiation reaction.
KW - 1-phenyl-1,2-propanedione
KW - Camphorquinone
KW - Photopolymerization
UR - http://www.scopus.com/inward/record.url?scp=0033096556&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033096556&partnerID=8YFLogxK
M3 - Article
C2 - 10551103
AN - SCOPUS:0033096556
VL - 15
SP - 120
EP - 127
JO - Dental Materials
JF - Dental Materials
SN - 0109-5641
IS - 2
ER -