Banca de DEFESA: LARISSA MENDONCA DE MIRANDA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LARISSA MENDONCA DE MIRANDA
DATE: 26/09/2024
TIME: 14:00
LOCAL: Departamento de Odontologia - Auditório
TITLE:

CLINICAL PERFORMANCE, MARGINAL AND INTERNAL DISCREPANCY OF ULTRA TRANSLUCENT ZIRCONIA MONOLITHIC CROWNS: A RANDOMIZED, CONTROLLED CLINICAL TRIAL

KEY WORDS:

CAD/CAM, Ultratranslucent zirconia, Dissilicate ceramic, Marginal discrepancy, Internal discrepancy, Replica technique, Dental prosthesis, ceramics, quality of life, crown.

PAGES: 144
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Clínica Odontológica
SUMMARY:

Objective: To evaluate the clinical longevity, marginal discrepancy (MD), and internal discrepancy (ID) of monolithic posterior full crowns fabricated from two CAD/CAM ceramic materials, as well as the impact of oral rehabilitation on aesthetic satisfaction and patient quality of life. Materials and Methods: A total of 24 crowns were installed in 18 participants, allocated into two groups: Control (LD, Lithium Disilicate - IPS e.max CAD; Ivoclar AG) and Experimental (Zr, Zircon FitPlus-Talmax, Curitiba, Paraná). The crowns were evaluated before treatment (T0) and after 1 (T1), 6 (T2), 12 (T3), and 24 (T4) months using modified United States Public Health Service (USPHS) criteria, visual analog scales (VAS), and Oral Impacts on Daily Performances (OIDP). Ten units of each material were selected for the evaluation of ID and MD using the replica technique. The internal part of each crown was filled with fluid consistency addition silicone (X-light, 3M ESPE) and placed in position in the mouth under constant pressure until the silicone polymerized. The crown was then removed, leaving the fluid silicone adhered inside. Next, a small portion of dense consistency silicone (Express XT, 3M ESPE) was inserted inside the crown, in intimate contact with the fluid silicone. After final setting, the silicone die formed by the two materials was removed from the crown's interior. The die was then sectioned into 8 hemi-faces. For ID analysis, the thickness of the fluid silicone was measured in four regions (O: occlusal, C: cusp, A: axial, CH: chamfer), with 5 measurements taken per region. For MD analysis, measurements were taken in the finish line area, with 5 measurements performed on each hemi-face, totaling 20 measurements per crown. Measurements were taken using an optical stereomicroscope (Stereo Discovery V20) at 40x magnification with software assistance. Shapiro-Wilk normality tests, one-factor ANOVA for MD, two-factor ANOVA and Tukey's test (5%) for ID were performed. Survival analysis was conducted using Kaplan-Meier followed by the log-rank test (α = .05). OIDP and USPHS data were descriptively analyzed, while VAS for aesthetic satisfaction was statistically assessed using Mann-Whitney, Friedman, and Wilcoxon post hoc tests. Results: For the 18 participants with a mean age of 38.5 years, 11 crowns were made of LD and 13 of Zr. The overall survival rate after 60 months was 95.8%, with 100% for the control group and 92.3% for the zirconia group. The log-rank test did not indicate a significant difference between the two groups (p=0.450). Mann-Whitney testing revealed no differences between the groups, regardless of satisfaction criteria or follow-up times (P>0.05). For both groups, aesthetic satisfaction across all criteria was significant (P<0.05). For MD, one-factor ANOVA showed that the "ceramic" factor was not significant (p=0.297). MD was similar between the Zr group (108.4±34.6 µm) and the LD group (95.7±13.6 µm). As for the ID analysis, two-factor ANOVA revealed that only the "region" factor (p=0.00) was significant, meaning the type of ceramic did not influence the results (p=0.4). In the experimental group analysis, ZrO (124.1±34.9A µm) and DLO (154.6±33.7Aµm) were similar to each other and showed higher ID values than other regions. Conclusion: The survival rates between the evaluated materials were not significantly different, demonstrating acceptable clinical performance after 24 months of follow-up. The MD and ID were similar between the evaluated materials, with values within clinically acceptable parameters. Additionally, for both materials, the occlusal region showed the highest ID.

COMMITTEE MEMBERS:
Presidente - 1640419 - RODRIGO OTHAVIO DE ASSUNCAO E SOUZA
Interna - 1678126 - PATRICIA DOS SANTOS CALDERON
Externo à Instituição - AMANDA MARIA DE OLIVEIRA DAL PIVA
Externa à Instituição - DAYANNE MONIELLE DUARTE MOURA - UERN
Externa à Instituição - RENATA MARQUES DE MELO