PMID- 33491373 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Oral Health Prev Dent JT - Oral Health and Preventive Dentistry IS - 1757-9996 (Electronic) IP - 1 VI - 19 PST - epublish DP - 2021 PG - 7-14 LA - en TI - Effects of Bleaching Gels on Dental Enamel Crystallography LID - 10.3290/j.ohpd.b875523 [doi] FAU - Vargas-Koudriavtsev, Tatiana AU - Vargas-Koudriavtsev T FAU - Fonseca-Jiménez, Pamela AU - Fonseca-Jiménez P FAU - Barrantes-Delgado, Patricia AU - Barrantes-Delgado P FAU - Ruiz-Delgado, Berta AU - Ruiz-Delgado B FAU - Conejo-Barboza, Geraldine AU - Conejo-Barboza G FAU - Herrera-Sancho, Óscar-Andrey AU - CN - OT - bleaching agent OT - enamel crystallography OT - X-ray diffraction AB - Purpose: The aim of the present research was to analyse the effects of two bleaching agents, on the enamel crystallography by means of X-ray diffraction. Material and Methods: Twelve human sound posterior teeth, were collected for the present study (n = 12) and from each tooth two enamel slabs were obtained and randomly assigned to one of two different bleaching protocols. The first protocol involved an in-office bleaching agent (hydrogen peroxide 37.5%/ SDI Polaoffice+), and the second an at-home whitening product (carbamide peroxide 16%/ PHILIPS Zoom! NiteWhite). X-ray diffraction readings were made before and after applying the treatments in order to analyse the peak intensity and crystal domain size. Additionally, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were carried out to identify the composition correctly. Statistical analysis included repeated measures analysis of variance (p ≤ 0.05). Results: Peak intensity in spectra obtained by X-ray diffraction had a tendency to diminish, mostly in the at-home bleaching group. The analysed data approximate a decrease in the crystal domain size among the samples treated for longer periods of time. Statistical analysis depicted no statistically significant differences among the experimental groups (p ≥ 0.05). Conclusions: Crystal domain size had a tendency to decrease, mostly when the enamel was treated by bleaching gels that had to be applied by prolonged periods of time. AID - 875523