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Er:YAG laser pulse width influence in dentin and esthetic restorative materials


The laser use in dentistry deserves to be explored in its potential. Some parameters have not yet been assessed for its effect on the interaction between dentin and aesthetic materials, whether direct or indirect. This study aims to assess the influence of Er:YAG laser temporal width pulse on the constituents of the adhesive interface in dentin and in Y-TZP zirconia. This project includes two different experiments due to preparation and test sample characteristics. However, the same variation factor will be tested in both - surface treatment (7 levels for each substrate - dentin and zirconia), comprising 14 experimental groups: G1 dentin (D) no irradiation; G2 (D 200mJ / 20Hz- 1) (50 in microseconds - ms); G3 (D) (1-300ms); G4 (D) (1-600ms); G5 (D 80mJ / 2Hz - 2) (50ms); G6 (D) (2-300ms); G7 (D) (2-600ms); G8 zirconia (Z) without irradiation; G9 (Z) tribochemical abrasion; G10 (Z 100mJ / 10Hz- 3) (50ms); G11 (Z) (3-100ms); G12 (Z) (3- 300ms); G13 (Z) (3- 600ms); G14 (Z) (3-1000ms). Response variables to be analyzed will be: 1) dentin - morphology by transmission electron microscopy (TEM) (n=3); organic and inorganic components by means of micro-Raman spectroscopy (n=3); micromorphology of the adhesive interface by means of confocal microscopy (n=1); and bond strength (BS) per microshear assay (¼SBS) (n=11); and 2) Zirconia Y-TZP - morphology by electron microscopy of high resolution scan (SEM) (n=3), percentage of phase transformation by diffraction of x-rays (n=1), surface loss and surface roughness by optical profilometry and BS by ¼SBS (n=8). For mounting of the specimens will be used for ¼SBS a self etching system in conjunction with a composite resin in dentin and resin cement on zirconia. Quantitative data obtained will be analyzed statistically (p <0.05) and qualitative will be described in comparison. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DA SILVA, BEATRIZ TOGORO FERREIRA; TREVELIN, LIVIA TOSI; SCHROETER, ANANDA CAROLINA; WILLERS, AMANDA ENDRES; CESAR, PAULO FRANCISCO; MATOS, ADRIANA BONA. Effect of silica coating and laser treatment on the flexural strength, surface characteristics, and bond strength of a dental zirconia. European Journal of Oral Sciences, JAN 2021. Web of Science Citations: 0.
TREVELIN, LIVIA TOSI; FERREIRA DA SILVA, BEATRIZ TOGORO; DE FREITAS, PATRICIA MOREIRA; MATOS, ADRIANA BONA. Influence of Er:YAG laser pulse duration on the long-term stability of organic matrix and resin-dentin interface. Lasers in Medical Science, v. 34, n. 7, p. 1391-1399, SEP 2019. Web of Science Citations: 0.
FERREIRA DA SILVA, BEATRIZ TOGORO; CESAR, PAULO FRANCISCO; DE FREITAS, PATRICIA MOREIRA; PALMA-DIBB, REGINA GUENKA; MATOS, ADRIANA BONA. Three-dimensional profilometric assessment of Er:YAG laser irradiated unsintered zirconia. Journal of Materials Science, v. 51, n. 15, p. 7266-7275, AUG 2016. Web of Science Citations: 0.

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