The effects of CO2 laser on the cement of human permanent molar. A scanning electron microscopy study
Efeitos do raio laser CO2 no cemento em molares permanentes humanos. Estudo ao microscópio eletrônico de varredura
Watanabe, I-S; Watanabe, I-S; Azeredo, R.A.; Azeredo, R.A.; Liberti, E.A.; Liberti, E.A.; Sobrinho, A.N.; Sobrinho, A.N.; Goldenberg, S.; Goldenberg, S.
Rev. odontol. UNESP, vol.15, nÚnico, p.91-98, 1986
Abstract
The cervical, medium and apical thirds of the roots of nine superior permanent molars, were irradiated by CO2 laser, with simple and continuous discharges of 10 watts of energy. Afterwards, the roots were dehydrated, dryed, mounted in appropriated stubs and metalized to be examinating in a scanning electron microscope, JSM-P15, Jeol. According to our results, the cervical and medium thirds presented a low groove, smooth surface, high and well delimited borders. On the other hand, when the simple discharge was used, a low depression, of round shape, circular borders and irregular adjacent area were observed. The apical thirds of the root, after CO2 laser irradiation with simple discharge, presented a round foramen deeper than in cervical and medium thirds, smooth borders and irregular adjacent area with continuous discharge. This third showed the same characteristics ofthe cervical and medium thirds. Even in cervical, medium and apical thirds presented small projections ofvcement with various diameters in its borders.
Keywords
CO2 laser, cement, scanning electron microscope
Resumo
Os terços cervical, médio e apical das raízes de 9 molares superiores permanentes foram irradiados pelo laser CO2, com disparos simples e contínuos de intensidade 10 watts. Em seguida, as raízes foram seccionadas e desidratadas. Após a secagem, foram montadas em bases apropriadas e metalizadas para serem examinadas em um microscópio eletrônico de varredura, JSM-P15 , Jeol. Após o disparo contínuo, os terços cervical e médio apresentaram um sulco raso, de superfície lisa, margens elevadas e delimitadas, e quando foi utilizado o disparo simples, uma depressão rasa, de forma esférica, de bordas circulares de superfície lisa e compacta. O terço apical da raiz, após a irradiação pelo laser CO2 com disparo simples, apresentou um forame esférico de profundidade relativamente maior que nos terços cervical e médio, margens lisas e área adjacente irregular. Com disparo contínuo, este terço mostrou as mesmas características dos terços cervical e médio. Tanto os terços cervical, médio e apical apresentaram nas margens pequenas projeções de cemento com diâmetros variados.
Palavras-chave
Laser CO2 , cemento, microscopia eletrônica de varredura
References
1. ADRIAN, J.C.; BERNIER, J.L. & SPRAUGUE, W.G. - Laser and dental pulp. J. amo dento Ass. , 83: 133- 7, 1971.
2. BALESTRE, R. - Laser in Odontology. Actual. odontostomat. (Paris), 27: 785-94, 1973.
3. FISHER, S.E. & FRAME, J.W. - The effects of carbon dioxide surgical laser on oral tissues. Brit. J. oral maxillofac. Surg., 54: 414- 23, 1984.
4. GOLDMAN, L. ; GRAY, J.A. ; GOLDMAN, B. & MAYER, R. - Effect of laser bean impacts on teeth. J. amo dent. Ass., 7: 601-6, 1965.
5. GRASSER, H. - Possibilities for the use of laser in dental surgery. Dtsch. Zahnaerzt/. z., 32: 512-5,1977.
6. KANTOLA, S. - Laser - Induced effects on tooth structure. X-ray diffraction study of dental enamel exposed to a CO2 laser. Acta odont. scand., 31: 369-79, 1973.
7. LENZ, H. & EICHELER, J. - Wirkung des Argonlesers anf die Gefasse,Mikro-Und Ma Krozirkulation der Schleimhaut der Hamster - backentasche. Laryng. Rhinol., 54: 612-9,1975.
8. LENZ, H. ; EICHLER, J. & SCHAFER, A. - Experimental hemiglossectomia with an argon laser on tongues from dead humans and of live rabbits. Acta otolaryngol., 83: 528-35, 1977.
9. LH UISSET, F. - Note à propos d'impacts laser à gaz carbonique sur la dentine. Chir. Dent. France, 49: 37-9,1979.
10. L1BERMAN, R. ; SEGAR, T.H. ; NORDENBERG, D. & SEREBRO, U. - Adhesion of composite materiais to enamel. Comparison between the use of acid and lasing as pretreatment. Laser Surg, med., 4: 232-327, 1984.
11. MELCER, J. ; CHAUMETTE, M.T. ; MELCER, F. ; DEBARDIM, J. ; HASSON, R. ; HERARD, R. ; PINAUDEAU, Y. & WEILL, R. - Treatment of dental decay by CO2 laser bean : Preliminary resu Its. Laser Surg, Med., 4: 311- 21, 1984.
12. PECK, S. & PECK, H. - Laser radiation: some specific dental effects and evaluation of its potential in Dentistry. J. prosth. Dent., 17: 195-203,1967.
13. STERN, R.H. ; RENGER, H.L. & HOWELL, F.V. - Laser effects on vital dental pulps. Brit. dento J., 1: 26-8, 1969.
14. STERN, R.H. & SOGNNAES, R.F. - Laser effect on dental hard tissues - A preliminary reporto J. South Calit.,33: 17-9, 1965.
15. STERN, R.H. ; VAHL, J. & SOGNNAES, R.F. - Lased enamel: ultrastructural observations of pulsed carbon dioxide laser effects. J. dento Res., 51: 455-60, 1972.
16. STRONG, M.S. ; JAKO, G.J. ; POLANJI, T. & WALLACE, R.A. - Laser surgery in the aerodigestive tract. Am. J. Surg., 126: 529, 1973.
17. TAYLOR, R.; SHKLAR, G. & ROEBER, F. - The effects of laser radiation on teeth dental pulp, and oral mucosa of experimental animais" OraISurg., 19: 786-95, 1965.
18. TUFFIN, J.R. & CARRUTH, J.A.S. - The carbon dioxide surgical laser. Brit. dent. J., 149: 255, 1980.
19. VAIL, J. - Electron Microscopical and X-Ray Cristalographic. Investigations of teeth exposed to laser rays. Caries Res. ,2: 10-8,1968.
20. YAMAMOTO, H. ; OKABE, H. ; OOYA, K. & HANAOKA, S. - Laser effect on vital oral tissues: a preliminary investigation. J. oral Path., 1: 256-65, 1972.
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email