Fluoride uptake and acid resistance of enamel irradiated with Er:YAG laser

Lasers in Medical Science - Tập 23 - Trang 141-147 - 2007
Flávia M. Bevilácqua1, Denise Maria Zezell2, Romeu Magnani3, Patricia A. da Ana2, Carlos de Paula Eduardo1
1Laboratório Especial de Laser em Odontologia (LELO), Faculdade de Odontologia, Universidade de São Paulo, São Paulo, Brazil
2Centro de Lasers e Aplicações–Laboratório de Biofotônica, Instituto de Pesquisas Energéticas e Nucleares, Cidade Universitária, São Paulo, Brazil
3Instituto de Química, UNESP, Rua Francisco Degni s/n, Araraquara, Brazil

Tóm tắt

This study evaluated the resistance to demineralization and fluoride incorporation of enamel irradiated with Er:YAG. A total of 110 bovine teeth were selected and divided into eight groups: unlased, 37% phosphoric acid, and samples irradiated with the Er:YAG laser at several fluences (31.84 J/cm2, 25.47 J/cm2, 19.10 J/cm2, 2.08 J/cm2, 1.8 J/cm2, and 0.9 J/cm2). The application of acidulated phosphate fluoride was performed after treatments. All samples were immersed in 2 ml of 2.0 M acetic–acetate acid solution at pH 4.5 for 8 h, and fluoride, calcium, and phosphorus ions dissolved were analyzed by atomic absorption spectrometry and spectrophotometry. The phosphoric acid and 31.84 J/cm2 groups presented the lowest dissolution of calcium and phosphorus ions. Higher fluoride incorporation was observed on 1.8 J/cm2 and 0.9 J/cm2 groups. Based on these results, Er:YAG laser was able to decrease acid dissolution and increase fluoride uptake and can be a promissory alternative for preventive dentistry.

Tài liệu tham khảo

Petersen PE, Lennon MA (2004) Effective use of fluorides for the prevention of dental caries in the 21st century: the WHO approach. Community Dent Oral Epidemiol 32:319–321 Bratthall D, Hansel-Petersson G, Sundberg G (1996) Reasons for the caries decline: what do the experts believe? Eur J Oral Sci 104:433–435 Marthaler TM (2004) Changes in dental caries 1953–2003. Caries Res 38:173–181 Lima YBO, Cury JA (2003) Seasonal variation of fluoride intake by children in a subtropical region. Caries Res 37:335–338 Featherstone JDB (2000) The science and practice of caries prevention. J Am Dent Assoc 131:887–899 Feathestone JDB (2004) The continuum of dental caries—evidence for a dynamic process. J Dent Res 83:C39–C42 Ten Cate JM, Featherstone JDB (1991) Mechanistic aspects of the interactions between fluoride and dental enamel. CRC Crit Rev Oral Biol 2:283–296 McCann HG (1968) The solubility of fluorapatite and its relationship to that of calcium fluoride. Arch Oral Biol 13:987–1001 Phan ND, Fried D, Featherstone JDB (1999) Laser-induced transformation of carbonated apatite to fluorapatite on bovine enamel. Proc SPIE 3593:233–240 Dijkman AG, Boer P, Arends J (1983) In vivo investigation on the fluoride content in and on human enamel after topical applications. Caries Res 17:392–402 Fried D, Featherstone JDB, Visuri SR, Seka W, Walsh JT (1996) The caries inhibition potential of Er:YAG and Er:YSGG laser irradiation. Proc SPIE 2672:73–78 Apel C, Meister J, Götz H, Duschner H, Gutknecht N (2005) Structural changes in human dental enamel after subablative erbium laser irradiation and its potential use for caries prevention. Caries Res 39:65–70 Nammour S, Demortier G, Florio P, Delhaye Y, Pireaux J-J, Morciaux Y, Powel L (2003) Increase of enamel fluoride retention by low fluence argon laser in vivo. Lasers Surg Med 33:260–263 Delbem ACB, Cury JA, Nakassima CK, Gouveia VG, Theodoro LH (2003) Effect of Er:YAG laser on CaF2 formation and its anti-cariogenic action on human enamel: an in vitro study. J Clin Laser Med Surg 21:197–201 Boari HGD, Zezell DM, Eduardo CP (2000) Dye enhancing Nd:YAG irradiation on enamel aiming caries prevention. J Dent Res 19:1079 Tepper AS, Zehnder M, Pajarola GF, Schmidlin PR (2004) Increased fluoride uptake and acid resistance by CO2 laser-irradiation through topically applied fluoride on human enamel in vitro. J Dent 32:635–641 Featherstone JBD, Fried D, Bitten ER (1997) Mechanisms of laser induced solubility reduction in dental enamel. Proc SPIE 2973:112–116 Ana PA, Bachmann L, Zezell DM (2006) Lasers effects on enamel for caries prevention. Laser Phys 16:865–875 Stern RH, Sognnaes RF (1972) Laser inhibition of dental caries suggested by first tests in vivo. J Am Dent Assoc 85:1087–1090 Morioka T, Tagomori S, Oho T (1991) Acid resistance of lased human enamel with Er:YAG laser. J Clin Laser Med Surg 9:215–217 Apel C, Meister J, Schmitt N, Gräber H-G, Gutknecht N (2002) Calcium solubility of dental enamel following sub-ablative Er:YAG and Er:YSGG laser irradiation in vitro. Lasers Surg Med 30:337–341 Kantorowitz Z, Featherstone JDB, Fried D (1998) Caries prevention by CO2 laser treatment: dependency on the number of pulses used. J Dent Am Assoc 129:585–591 Seka W, Featherstone JDB, Fried D, Visuri SR, Walsh JT (1996) Laser ablation of dental hard tissue: from explosive ablation to plasma-mediated ablation. Proc SPIE 2672:144–158 Delbem ACB, Cury JA (2002) Effect of application time of APF and NAF gels on microhardness and fluoride uptake of in vitro enamel caries. Am J Dent 15:169–172 Arimoto N, Susaki A, Katada H, Senda A (1998) Acid resistance in lased dentin. Proc. International Congress on Laser in Dentistry, pp 61–62 Cecchini RC, Zezell DM, Oliveira E, Freitas PM, Eduardo CP (2005) Effect of Er:YAG laser on enamel acid resistance: morphological and atomic spectrometry analysis. Lasers Surg Med 37:366–372 Li ZZ, Code JE, Van de Merme WP (1992) Er:YAG laser ablation of enamel and dentin of human teeth: determination of ablation rates at various fluences and pulse repetition rates. Lasers Surg Med 12:625–630 Apel C, Meister J, Ioana RS, Franzen R, Hering P, Gutkanecht N (2002) The ablation threshold of Er:YAG and Er:YSGG laser radiation in dental enamel. Lasers Med Sci 17:246–52 Zach L, Cohen G (1965) Pulp response to externally applied heat. Oral Surg 19:515–530 Gouw-Soares S, Haypek O, Pelino JE, Eduardo CP (2001) Temperature rises in cavities prepared in vitro by Er:YAG laser. J Oral Laser Appl 1:119–123 Hossain M, Nakamura Y, Kimura Y, Yamada Y, Ito M, Matsumoto K (2000) Caries preventive effect of Er:YAG laser irradiation with or without water mist. J Clin Laser Med Surg 18:61–65 Burkers EJ, Hoke J, Gomes E, Wolbarsht M (1992) Wet versus dry enamel ablation by Er:YAG laser. J Prosthet Dent 67:847–851 Apel C, Schafer C, Gutknecht N (2003) Demineralization of Er:YAG and Er,Cr:YSGG laser-prepared enamel cavities in vitro. Caries Res 37:34–37 Stern RH, Sognnaes RF, Goodman F (1966) Laser effect on in vitro enamel permeability and solubility. J Am Dent Assoc 73:838–843 Nelson DGA, Wefel JS, Jongebloed WL, Featherstone JDB (1987) Morphology, histology and cristallography of human dental enamel treated with pulsed low-energy infrared laser irradiation. Caries Res 21:411–426 Fowler BO, Kuroda S (1986) Changes in heated and in laser-irradiated human tooth enamel and their probable effects on solubility. Calcif Tissue Int 38:197–208 Bachmann L, Craievich AF, Zezell DM (2004) Crystalline structure of dental enamel after Ho:YLF laser irradiation. Arch Oral Biol 49:923–929 Oho T, Morioka T (1990) A possible mechanism of acquired acid resistance of human dental enamel by laser irradiation. Caries Res 24:86–92 Hsu J, Fox JL, Wang Z, Powel GL, Otsuka M, Higuchi WI (1998) Combined effects of laser irradiation/solution fluoride ion on enamel demineralization. J Clin Laser Med Surg 16:93–105 Shirasuka T, Kodaka T, Debari K, Matsumoto K (1991) Acid resistance on human dental enamel by laser irradiation and fluoride treatment. J Dent Res 70:350