Banca de DEFESA: MARIANA DE ANDRADE NOGUEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIANA DE ANDRADE NOGUEIRA
DATE: 16/07/2026
TIME: 14:00
LOCAL: departamento de ODONTOLOGIA
TITLE:

Influence of the Translucency and Thickness of Permanent 3D-Printed Resins on the Microhardness and Degree of Conversion of Resin Cements

KEY WORDS:

Printing Three-Dimensional; Resin Cements; Polymerization.

PAGES: 38
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

Objective: To evaluate the influence of the thickness and translucency of 3D-printed permanent restorative resins on the microhardness and degree of conversion of resin cements. Materials and Methods: Three-dimensional printed resin blocks measuring 9 mm × 7 mm were fabricated with thicknesses of 0.5, 1.0, and 2.0 mm and three translucency levels (high, medium, and low) using a FlashForge Foto 6.0 (FlashForge) printer and a permanent restorative resin (Voxelprint Ceramic, FGM). Cement specimens were prepared using a custom-made mold designed to standardize the light-curing area, as well as the positioning and angulation of the printed resin blocks and cement specimens. Two resin cements were evaluated: a dual-cure resin cement (All Cem, FGM) and a light-cure resin cement (All Cem Venner, FGM) (N = 200). Specimens (3 × 3 × 1 mm) were light-cured using a Polywave Bluephase NG4 curing unit (Ivoclar) at an irradiance of 1200 mW/cm² for 40 s and allocated according to resin translucency (high, medium, and low), cement type (dual-cure and light-cure), and resin thickness (control, 0.5, 1.0, and 2.0 mm). In the control group, the resin cement was light-cured without the interposition of a 3D-printed resin block (n = 10). Vickers microhardness was measured using a microhardness tester (402 MVD, Wolpert) with a 300-g load applied for 5 s. Three indentations were performed on both the top and bottom surfaces of each cement specimen. The degree of conversion was determined by Fourier-transform infrared spectroscopy (FTIR). Data were analyzed using the Shapiro–Wilk test, three-way analysis of variance (ANOVA), and one-way ANOVA to compare the top and bottom surfaces. Results: Three-way ANOVA showed that, on the top surface, the DMT-0.5 (54.23 ± 1.73)^A, DHT-0.5 (53.39 ± 2.18)^A, and DLT-0.5 (52.40 ± 1.56)^A groups exhibited the highest Vickers microhardness values. On the bottom surface, the highest microhardness values were also observed in the DMT-0.5 (54.23 ± 1.73)^A, DHT-0.5 (53.39 ± 2.18)^A, and DLT-0.5 (52.40 ± 1.56)^A groups, whereas the lowest value was found for the FLT-2.0 group (26.70 ± 3.22)^F. Conclusion: The thickness and translucency of the 3D-printed resin significantly influenced the microhardness and degree of conversion of the resin cements. Greater resin thickness and lower translucency were associated with reduced mean values of both properties.

COMMITTEE MEMBERS:
Presidente - 1640419 - RODRIGO OTHAVIO DE ASSUNCAO E SOUZA
Interna - 1678126 - PATRICIA DOS SANTOS CALDERON
Externa à Instituição - LUANA MARIA MARTINS DE AQUINO - UNINASSAU