Banca de DEFESA: PÂMELA TAYNÁ MATIAS BEZERRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PÂMELA TAYNÁ MATIAS BEZERRA
DATE: 06/08/2025
TIME: 08:30
LOCAL: Departamento de Odontologia - AUDITÓRIO
TITLE:

IN VITRO EFFECT OF SIMULATED BRUSHING ON COLOR STABILITY, SURFACE ROUGHNESS AND MICROBIOLOGICAL ADHESION OF CHARACTERIZATION COMPOSITE RESINS FOR 3D PRINTED DENTAL PROSTHESIS BASES

KEY WORDS:

Composite Resins; Printing, Three-Dimensional; Denture base resin.

PAGES: 45
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

With advances in CAD-CAM systems, new digital technologies have optimized the fabrication of complete dentures. In this context, photopolymerizable materials have been introduced for the extrinsic characterization of 3D-printed denture bases. However, studies evaluating the performance of these materials in terms of surface and microbiological properties, especially after mechanical brushing, remain scarce. Therefore, this in vitro study aimed to evaluate the effect of simulated brushing on color stability, surface roughness, and microbial adhesion of characterizing resin composites with different viscosities applied to denture base materials. Discs (10 × 3.0 mm) were fabricated using a 3D-printed denture base resin (Bio Denture; PRIZMA) and a conventional heat-polymerized resin (VIPICRIL; VIPI) (n = 15). Three extrinsic characterizations (2 mm thick) were applied to the printed discs: one regular viscosity (Make Smile Gengiva Fill [RV]) and two low-viscosity composites (Make Smile Pigmento [LV_49] and Lite Art Stain [LV_30]), all light-cured (25W/5 minutes). The heat-polymerized resin was processed and characterized with conventional pink pigment (STG [STG]) using the compression molding technique. Color coordinates and color stability (ΔE₀₀) were measured using a colorimeter, surface roughness (Ra) was assessed by optical profilometry, and microbial adhesion was quantified by counting Candida albicans (log CFU/mL) before and after 20,000 cycles of simulated brushing. Color and roughness data were analyzed using the Kruskal-Wallis test (between materials) and the Wilcoxon test (before and after brushing). Microbial adhesion was evaluated by one-way ANOVA followed by Tukey’s post hoc test (α = 0.05). The STG and LV_49 groups showed greater color change compared to LV_30 and RV (p < 0.05), although all remained within clinically acceptable limits (ΔE₀₀ ≤ 2.25). Simulated brushing increased surface roughness in all groups except STG, and STG and LV_49 maintained the highest roughness values after aging (p < 0.05). Candida albicans adhesion significantly increased after brushing (p < 0.05), with no significant differences among the materials (p > 0.05). Therefore, simulated brushing influenced both surface roughness and color of the tested materials, although changes remained within clinically acceptable thresholds. The LV_30 and RV composites showed superior performance compared to the others, with lower color change and roughness after aging. Additionally, brushing promoted increased fungal adhesion by Candida albicans, regardless of the composite type.

COMMITTEE MEMBERS:
Interna - 1459400 - ADRIANA DA FONTE PORTO CARREIRO
Externa à Instituição - LUANA MARIA MARTINS DE AQUINO - UNINASSAU
Externo à Instituição - MOAN JÉFTER FERNANDES COSTA - UPE