摘要

A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65mm (diameter)x0.5mm (thick). Aging effects of immersing in 75% ethanol for up to 14h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones. Copyright (C) 2000 Elsevier Science B.V. A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65 mm (diameter)×0.5 mm (thick). Aging effects of immersing in 75% ethanol for up to 14 h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones.
原文英語
頁(從 - 到)1399-1408
頁數10
期刊Biomaterials
21
發行號13
DOIs
出版狀態已發佈 - 2000

指紋

Dental composites
Acoustic emissions
Acoustics
Tooth
Lasers
Fillers
Immersion
Ethanol
Hot Temperature
Thermoacoustics
Continuous wave lasers
Gas Lasers
Large scale systems
Sample Size
Resins
Aging of materials

引用此文

Laser-induced acoustic emissions in experimental dental composites. / Lee, Sheng Yang; Lin, Che Tong; Ke, En Sheng; Pan, Li Chern; Huang, Haw Ming; Shih, Yung Hsun; Cheng, Hsin Chung.

於: Biomaterials, 卷 21, 編號 13, 2000, p. 1399-1408.

研究成果: 雜誌貢獻文章

@article{49ebc95d47d148e4a83aa3be0425810e,
title = "Laser-induced acoustic emissions in experimental dental composites",
abstract = "A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75{\%} ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5vol{\%} of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65mm (diameter)x0.5mm (thick). Aging effects of immersing in 75{\%} ethanol for up to 14h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones. Copyright (C) 2000 Elsevier Science B.V. A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75{\%} ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol{\%} of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65 mm (diameter)×0.5 mm (thick). Aging effects of immersing in 75{\%} ethanol for up to 14 h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones.",
keywords = "Acoustic emissions, Dental composites, Laser, Silanization, Barium compounds, Carbon dioxide lasers, Continuous wave lasers, Laser beam effects, Plastics fillers, Reinforced plastics, Laser-induced acoustic emissions, camphorquinone, filler, methacrylic acid dimethylaminoethyl ester, polymer, resin cement, silicate, triethylene glycol dimethacrylate, unclassified drug, article, carbon dioxide laser, drug analysis, drug formulation, evoked auditory response, in vitro study, materials testing, priority journal, technique, Acoustics, Barium Compounds, Composite Resins, Equipment Design, Ethanol, Heat, Immersion, Lasers, Materials Testing, Microspheres, Silicates",
author = "Lee, {Sheng Yang} and Lin, {Che Tong} and Ke, {En Sheng} and Pan, {Li Chern} and Huang, {Haw Ming} and Shih, {Yung Hsun} and Cheng, {Hsin Chung}",
note = "被引用次數:2 Export Date: 9 August 2016 CODEN: BIMAD 通訊地址: Lee, S.Y.; Graduate Institute, Oral Rehabilitation Sciences, Taipei Medical College, 250 Wu-Hsing Street, Taipei, Taiwan; 電子郵件: sseanlee@tmc.edu.tw 化學物質/CAS: barium borosilicate; Barium Compounds; Composite Resins; Ethanol, 64-17-5; Silicates 商標: bisgma, Shin Nakamura, Japan 製造商: Aldrich, United States; Fluka, Switzerland; Shin Nakamura, Japan 參考文獻: Van Noort, R., Cardew, G.E., Howard, I.C., A study of the interfacial shear and tensile stresses in a restored molar tooth (1988) J Dent, 16, pp. 286-293; Van Noort, R., Noroozi, S., Howard, I.C., Cardew, G.E., A critique of bond strength measurements (1989) J Dent, 17, pp. 61-67; Van Noort, R., Cardew, G.E., Howard, I.C., Noroozi, S., The effect of local interfacial geometry on the measurement of the tensile bond srength to dentin (1991) J Dent Res, 70, pp. 889-893; Fowler, C.S., Swartz, M.L., Moore, B.K., Rhodes, B.F., Influence of selected variables on adhesion testing (1988) Dent Mater, 4, pp. 265-269; Narkis, M., Chen, E.J.H., Pipes, R.B., Review of methods for characterization of interfacial fiber-matrix interactions (1988) Polym Compos, 9, pp. 245-251; Broutman, L.J., Measurements of the fiber-polymer matrix interfacial strength (1968) In: Interface in Composites, 452, pp. 27-41. , STP Philadelphia: American Society for Testing and Materials; McMahon, P.E., Graphite fiber tensile property evaluation (1973) In: Analysis of the Test Methods for High Modulus Fibers and Composites, 521, pp. 367-389. , STP Philadelphia: American Society for Testing and Mateials; Peters, P.W.M., Springer, G.S., Effects of cure and sizing on fiber-matrix bond strength (1987) J Compos Mater, 21, pp. 157-171; Ruff A.W., Jr., Whitenton, E.P., A dynamic microindentation apparatus for materials characterization (1988) J Test Eval, 16, pp. 12-16; Boll, D.J., Jensen, R.M., Cordner, L., Compression behavior of single carbon filaments embedded in an epoxy polymer (1990) J Compos Mater, 24, pp. 208-219; Kondo, S., Ohkawa, S., Hanawa, T., Sugawara, T., Ota, M., Studies on the dynamic durability of dental restorative materials. Part 4: Materials evaluation of initial and fatigue specimen for composite resins by acoustic emission method (1981) J Japan Society Dent Apparatus Mater, 22, pp. 315-322; Narisawa, I., Oba, H., An evaluation of acoustic emission from fiber-reinforced composite (1984) J Mater Sci, 19, pp. 1777-1786; Sachse, W., Kim, K.Y., Quantitative acoustic emission and failure mechanics of composite materials (1987) Ultrasonics, 25, pp. 195-203; Roy, C., El Ghorba, M., Monitoring progression of mode II delamination during fatigue loading through acoustic emission in laminated glass fiber composite (1988) Polym Compos, 9, pp. 345-351; Yuyama, S., Imanaka, T., Ohtsu, M., Quantitative evaluation of microfracture due to disbonding by wave form analysis of acoustic emission (1988) J Acoust Soc Am, 83, pp. 976-983; Kim, K.H., Park, J.H., Imai, Y., Kishi, T., Fracture behavior of dental composite resins (1991) Biomed Mater Engng, 1, pp. 49-61; Williams J.H., Jr., Lee, S.S., Acoustic emission monitoring of fiber composite materials and structures (1978) J Compos Mater, 12, pp. 348-369; Hamstad, M.A., A review: Acoustic emission, a tool for composite-materials studies (1985) Exp Mech, 26, pp. 7-13; Kim, K.H., Park, J.H., Imai, Y., Kishi, T., Microfracture mechanisms of dental resin composites containing spherical-shaped filler particles (1994) J Dent Res, 73, pp. 499-504; Kondo, S., Ohkawa, S., Hanawa, T., Sugawara, T., Ota, M., Evaluation of conventional and microfilled composite resins using an acoustic emission technique (1985) Dent Mater, 4, pp. 81-87; Wu, W., Thermoacoustic technique for determining the interface and/or interply strength in composites (1990) SAMPLE J, 26, pp. 11-15; Duray, S.J., Lee, S.-Y., Menis, D.L., Gilbert, J.L., Lautenschlager, E.P., Greener, E.H., Laser acoustic emission thermal technique (LAETT): A technique for generating acoustic emission in dental composites (1996) Dent Mater, 12, pp. 13-18; Lee, S.-Y., Lin, C.-T., Dong, D.-R., Huang, H.-M., Acoustic emission generated in aged dental composites using a laser thermoacoustic technique (2000) J Oral Rehabil, , in press; (1993) Course Handbook for SNT-TC-1A Qualification/certification Course for Acoustic Emission Personnel, , Physical Acoustics Corporation (Level II). Princeton: Physical Acoustics Corporation; Lee, S.-Y., Greener, E.H., Mueller, H.J., Chiu, C.-H., Effect of food and oral simulating fluids on dentine bond and composite strength (1994) J Dent, 22, pp. 352-359; Lee, S.-Y., Greener, E.H., Mueller, H.J., Effect of food and oral simulating fluids on structure of adhesive composite systems (1995) J Dent, 23, pp. 27-35; Lee, S.-Y., Greener, E.H., Menis, D.L., Detection of leached moieties from dental composites in fluids simulating food and saliva (1995) Dent Mater, 11, pp. 348-353; Lee, S.-Y., Huang, H.-M., Lin, C.-Y., Shih, Y.-H., Leached components from dental composites in oral simulating fluids and the resultant composite strengths (1998) J Oral Rehabil, 25, pp. 575-588; Lin, C.-T., Lee, S.-Y., Keh, E.-S., Dong, D.-R., Huang, H.-M., Influence of silanization and filler fraction on aged dental composites (2000) J Oral Rehabil, , in press; Ferracane, J.L., (1983) The Correlation between the Physical Properties and Degree of Conversion on Unfilled Bis-GMA Based Dental Resin, Dissertation, , Chicago: Northwestern University; Wu, W., McKinney, J.E., Influence of chemicals on wear of dental composites (1982) J Dent Res, 61, pp. 1180-1183; McKinney, J.E., Wu, W., Chemical softening and wear of dental composites (1985) J Dent Res, 64, pp. 1326-1331; Roulet, J.-F., (1987) Degradation of Dental Polymers, pp. 60-90. , Karger: Basel; Spanner, J.C., Brown, A., Hay, D.R., Mustafa, V., Notvest, K., Pollock, A., Fundamental of acoustic emission testing - Part 4: introduction to acoustic emission signal characterization (1987) Nondestructive Testing Handbook - Acoustic Emission Testing, 5, pp. 27-33. , In: Miller RK, McIntire P, editor Columbus; American Society for Nondestructive Testing Inc; Spencer, P., Byerley, T.J., Eick, J.D., Witt, J.D., Chemical characterization of the dentin/adhesive interface by Fourier transform infrared photoacoustic spectroscopy (1992) Dent Mater, 8, pp. 10-15; Jastrzebski, Z.D., (1987) The Nature and Properties of Engineering Materials, , New York: John Wiley; S{\"o}derholm, K.-J., Influence of silane treatment and filler fraction on thermal expansion of composite resins (1984) J Dent Res, 63, pp. 1321-1326",
year = "2000",
doi = "10.1016/S0142-9612(00)00043-0",
language = "English",
volume = "21",
pages = "1399--1408",
journal = "Biomaterials",
issn = "0142-9612",
publisher = "Elsevier Science Ltd",
number = "13",

}

TY - JOUR

T1 - Laser-induced acoustic emissions in experimental dental composites

AU - Lee, Sheng Yang

AU - Lin, Che Tong

AU - Ke, En Sheng

AU - Pan, Li Chern

AU - Huang, Haw Ming

AU - Shih, Yung Hsun

AU - Cheng, Hsin Chung

N1 - 被引用次數:2 Export Date: 9 August 2016 CODEN: BIMAD 通訊地址: Lee, S.Y.; Graduate Institute, Oral Rehabilitation Sciences, Taipei Medical College, 250 Wu-Hsing Street, Taipei, Taiwan; 電子郵件: sseanlee@tmc.edu.tw 化學物質/CAS: barium borosilicate; Barium Compounds; Composite Resins; Ethanol, 64-17-5; Silicates 商標: bisgma, Shin Nakamura, Japan 製造商: Aldrich, United States; Fluka, Switzerland; Shin Nakamura, Japan 參考文獻: Van Noort, R., Cardew, G.E., Howard, I.C., A study of the interfacial shear and tensile stresses in a restored molar tooth (1988) J Dent, 16, pp. 286-293; Van Noort, R., Noroozi, S., Howard, I.C., Cardew, G.E., A critique of bond strength measurements (1989) J Dent, 17, pp. 61-67; Van Noort, R., Cardew, G.E., Howard, I.C., Noroozi, S., The effect of local interfacial geometry on the measurement of the tensile bond srength to dentin (1991) J Dent Res, 70, pp. 889-893; Fowler, C.S., Swartz, M.L., Moore, B.K., Rhodes, B.F., Influence of selected variables on adhesion testing (1988) Dent Mater, 4, pp. 265-269; Narkis, M., Chen, E.J.H., Pipes, R.B., Review of methods for characterization of interfacial fiber-matrix interactions (1988) Polym Compos, 9, pp. 245-251; Broutman, L.J., Measurements of the fiber-polymer matrix interfacial strength (1968) In: Interface in Composites, 452, pp. 27-41. , STP Philadelphia: American Society for Testing and Materials; McMahon, P.E., Graphite fiber tensile property evaluation (1973) In: Analysis of the Test Methods for High Modulus Fibers and Composites, 521, pp. 367-389. , STP Philadelphia: American Society for Testing and Mateials; Peters, P.W.M., Springer, G.S., Effects of cure and sizing on fiber-matrix bond strength (1987) J Compos Mater, 21, pp. 157-171; Ruff A.W., Jr., Whitenton, E.P., A dynamic microindentation apparatus for materials characterization (1988) J Test Eval, 16, pp. 12-16; Boll, D.J., Jensen, R.M., Cordner, L., Compression behavior of single carbon filaments embedded in an epoxy polymer (1990) J Compos Mater, 24, pp. 208-219; Kondo, S., Ohkawa, S., Hanawa, T., Sugawara, T., Ota, M., Studies on the dynamic durability of dental restorative materials. Part 4: Materials evaluation of initial and fatigue specimen for composite resins by acoustic emission method (1981) J Japan Society Dent Apparatus Mater, 22, pp. 315-322; Narisawa, I., Oba, H., An evaluation of acoustic emission from fiber-reinforced composite (1984) J Mater Sci, 19, pp. 1777-1786; Sachse, W., Kim, K.Y., Quantitative acoustic emission and failure mechanics of composite materials (1987) Ultrasonics, 25, pp. 195-203; Roy, C., El Ghorba, M., Monitoring progression of mode II delamination during fatigue loading through acoustic emission in laminated glass fiber composite (1988) Polym Compos, 9, pp. 345-351; Yuyama, S., Imanaka, T., Ohtsu, M., Quantitative evaluation of microfracture due to disbonding by wave form analysis of acoustic emission (1988) J Acoust Soc Am, 83, pp. 976-983; Kim, K.H., Park, J.H., Imai, Y., Kishi, T., Fracture behavior of dental composite resins (1991) Biomed Mater Engng, 1, pp. 49-61; Williams J.H., Jr., Lee, S.S., Acoustic emission monitoring of fiber composite materials and structures (1978) J Compos Mater, 12, pp. 348-369; Hamstad, M.A., A review: Acoustic emission, a tool for composite-materials studies (1985) Exp Mech, 26, pp. 7-13; Kim, K.H., Park, J.H., Imai, Y., Kishi, T., Microfracture mechanisms of dental resin composites containing spherical-shaped filler particles (1994) J Dent Res, 73, pp. 499-504; Kondo, S., Ohkawa, S., Hanawa, T., Sugawara, T., Ota, M., Evaluation of conventional and microfilled composite resins using an acoustic emission technique (1985) Dent Mater, 4, pp. 81-87; Wu, W., Thermoacoustic technique for determining the interface and/or interply strength in composites (1990) SAMPLE J, 26, pp. 11-15; Duray, S.J., Lee, S.-Y., Menis, D.L., Gilbert, J.L., Lautenschlager, E.P., Greener, E.H., Laser acoustic emission thermal technique (LAETT): A technique for generating acoustic emission in dental composites (1996) Dent Mater, 12, pp. 13-18; Lee, S.-Y., Lin, C.-T., Dong, D.-R., Huang, H.-M., Acoustic emission generated in aged dental composites using a laser thermoacoustic technique (2000) J Oral Rehabil, , in press; (1993) Course Handbook for SNT-TC-1A Qualification/certification Course for Acoustic Emission Personnel, , Physical Acoustics Corporation (Level II). Princeton: Physical Acoustics Corporation; Lee, S.-Y., Greener, E.H., Mueller, H.J., Chiu, C.-H., Effect of food and oral simulating fluids on dentine bond and composite strength (1994) J Dent, 22, pp. 352-359; Lee, S.-Y., Greener, E.H., Mueller, H.J., Effect of food and oral simulating fluids on structure of adhesive composite systems (1995) J Dent, 23, pp. 27-35; Lee, S.-Y., Greener, E.H., Menis, D.L., Detection of leached moieties from dental composites in fluids simulating food and saliva (1995) Dent Mater, 11, pp. 348-353; Lee, S.-Y., Huang, H.-M., Lin, C.-Y., Shih, Y.-H., Leached components from dental composites in oral simulating fluids and the resultant composite strengths (1998) J Oral Rehabil, 25, pp. 575-588; Lin, C.-T., Lee, S.-Y., Keh, E.-S., Dong, D.-R., Huang, H.-M., Influence of silanization and filler fraction on aged dental composites (2000) J Oral Rehabil, , in press; Ferracane, J.L., (1983) The Correlation between the Physical Properties and Degree of Conversion on Unfilled Bis-GMA Based Dental Resin, Dissertation, , Chicago: Northwestern University; Wu, W., McKinney, J.E., Influence of chemicals on wear of dental composites (1982) J Dent Res, 61, pp. 1180-1183; McKinney, J.E., Wu, W., Chemical softening and wear of dental composites (1985) J Dent Res, 64, pp. 1326-1331; Roulet, J.-F., (1987) Degradation of Dental Polymers, pp. 60-90. , Karger: Basel; Spanner, J.C., Brown, A., Hay, D.R., Mustafa, V., Notvest, K., Pollock, A., Fundamental of acoustic emission testing - Part 4: introduction to acoustic emission signal characterization (1987) Nondestructive Testing Handbook - Acoustic Emission Testing, 5, pp. 27-33. , In: Miller RK, McIntire P, editor Columbus; American Society for Nondestructive Testing Inc; Spencer, P., Byerley, T.J., Eick, J.D., Witt, J.D., Chemical characterization of the dentin/adhesive interface by Fourier transform infrared photoacoustic spectroscopy (1992) Dent Mater, 8, pp. 10-15; Jastrzebski, Z.D., (1987) The Nature and Properties of Engineering Materials, , New York: John Wiley; Söderholm, K.-J., Influence of silane treatment and filler fraction on thermal expansion of composite resins (1984) J Dent Res, 63, pp. 1321-1326

PY - 2000

Y1 - 2000

N2 - A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65mm (diameter)x0.5mm (thick). Aging effects of immersing in 75% ethanol for up to 14h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones. Copyright (C) 2000 Elsevier Science B.V. A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65 mm (diameter)×0.5 mm (thick). Aging effects of immersing in 75% ethanol for up to 14 h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones.

AB - A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65mm (diameter)x0.5mm (thick). Aging effects of immersing in 75% ethanol for up to 14h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones. Copyright (C) 2000 Elsevier Science B.V. A laser thermoacoustic technique was innovated to evaluate laser-induced acoustic emissions (AEs) in experimental dental composites aged with 75% ethanol solution. Experimental composite systems of 75/25 BisGMA/TEGDMA resin filled with 0, 12.6, 30.0, and 56.5 vol% of 8-μm silanized and unsilanized BaSiO6 were analyzed. The sample size was 4.65 mm (diameter)×0.5 mm (thick). Aging effects of immersing in 75% ethanol for up to 14 h on AEs were then evaluated. A continuous-wave CO2 laser was used to heat the samples. Acoustic emissions were collected as a function of filler fraction, laser power, silanization, and immersion time. Onset of burst-pattern acoustic signals characteristic of fracturing occurred at different laser powers for different tested groups. Acoustic emissions generally increased with laser power, in which lower laser powers produced low-amplitude (45-50 dB) signals; the amplitude distribution (50-85 dB) became more extensive as laser powers increased. After immersion, the lower laser powers could produce the same phenomenon. The higher the filler fraction, the fewer AEs generated. A large percentage AE reduction due to silanization was noted as a function of filler fraction. Unsilanized specimens showed more thermal damages than did silanized ones.

KW - Acoustic emissions

KW - Dental composites

KW - Laser

KW - Silanization

KW - Barium compounds

KW - Carbon dioxide lasers

KW - Continuous wave lasers

KW - Laser beam effects

KW - Plastics fillers

KW - Reinforced plastics

KW - Laser-induced acoustic emissions

KW - camphorquinone

KW - filler

KW - methacrylic acid dimethylaminoethyl ester

KW - polymer

KW - resin cement

KW - silicate

KW - triethylene glycol dimethacrylate

KW - unclassified drug

KW - article

KW - carbon dioxide laser

KW - drug analysis

KW - drug formulation

KW - evoked auditory response

KW - in vitro study

KW - materials testing

KW - priority journal

KW - technique

KW - Acoustics

KW - Barium Compounds

KW - Composite Resins

KW - Equipment Design

KW - Ethanol

KW - Heat

KW - Immersion

KW - Lasers

KW - Materials Testing

KW - Microspheres

KW - Silicates

U2 - 10.1016/S0142-9612(00)00043-0

DO - 10.1016/S0142-9612(00)00043-0

M3 - Article

VL - 21

SP - 1399

EP - 1408

JO - Biomaterials

JF - Biomaterials

SN - 0142-9612

IS - 13

ER -