Wettability modification of human tooth surface by water and UV and electron-beam radiation.
The wettability of the human tooth enamel and dentin was analyzed by measuring the contact angles of a drop of distilled water deposited on the surface. The samples were cut along the transverse and longitudinal directions, and their surfaces were subjected to metallographic mirror-finish polishing. Some samples were also acid etched until their microstructure became exposed. Wettability measurements of the samples were done in dry and wet conditions and after ultraviolet (UV) and electron beam (EB) irradiations. The results indicate that water by itself was able to increase the hydrophobicity of these materials. The UV irradiation momentarily reduced the contact angle values, but they recovered after a short time. EB irradiation raised the contact angle and maintained it for a long time. Both enamel and dentin surfaces showed a wide range of contact angles, from approximately 10° (hydrophilic) to 90° (hydrophobic), although the contact angle showed more variability on enamel than on dentin surfaces. Whether the sample's surface had been polished or etched did not influence the contact angle value in wet conditions.
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France; Unidad Académica de Odontología, Universidad Autónoma de Nayarit, Edificio E7, Ciudad de la Cultura "Amado Nervo", C.P. 63190 Tepic, Nayarit, Mexico. Electronic address: gab0409@gmail.com.
Gaby E
GE
Tiznado-Orozco
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France; Instituto de Física, UNAM, Circuito de la Investigación s/n, Ciudad Universitaria, 04510 Coyoacan, México, D.F., Mexico. Electronic address: jreyes@fisica.unam.mx.
José
J
Reyes-Gasga
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France. Electronic address: elefterie_florina@yahoo.com.
Florina
F
Elefterie
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France. Electronic address: christophe.beyens@ed.univ-lille1.fr.
Christophe
C
Beyens
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France. Electronic address: Ulrich.Maschke@univ-lille1.fr.
Ulrich
U
Maschke
UMET, Bâtiment C6, Université de Lille 1, Sciences et Technologies, 59650 Villeneuve d'Ascq, France. Electronic address: etienne.bres@univ-lille1.fr.
Etienne F
EF
Brès
D000293:Adolescent; D001641:Bicuspid / Q000737:chemistry*; D003743:Dental Enamel / Q000737:chemistry; D003804:Dentin / Q000737:chemistry; D004307:Dose-Response Relationship, Radiation; D004583:Electrons; D005260:Female; D006801:Humans; D008297:Male; D011829:Radiation Dosage; D014070:Tooth / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*; D017155:Wettability / Q000528:radiation effects; D055815:Young Adult
D014867:Water
Dentin; EB radiation; Enamel; UV radiation; Wettability