Banca de DEFESA: Allyne de Oliveira Souza

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Allyne de Oliveira Souza
DATE: 22/01/2024
TIME: 09:00
LOCAL: Plataforma Teams
TITLE:

Assessment of 3D-printed Resin Repairs on Occlusal Devices with Varied Materials and Surface Preparations

KEY WORDS:

TMJ; OCCLUSION SPLINT; SHEAR BOND STRENGTH; 3D PRINTING; DIGITAL DENTISTRY

PAGES: 100
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUMMARY:

Bruxism is a repetitive activity of the chewing muscles characterized by grinding, clenching, tooth contact, or sustained jaw tension, manifests during both waking and sleeping periods. This hyperactive behavior poses deleterious effects on the oral cavity and serves as a potential risk factor for Temporomandibular Disorders (TMD). Among the frequently employed interventions for managing both bruxism and TMD symptoms is the use of occlusal splints. The imperative expectation for dental materials is to mimic the structural and mechanical properties of natural teeth. Within this framework, occlusal devices are subject to occlusal forces, wear, and structural fractures, necessitating subsequent repair. Hence, the primary aim of this study was to assess and compare the adhesive interfaces in repairs made with diverse materials and distinct surface treatments applied to 3D printed resins for occlusal devices. The adopted methodology involved the assessment of the adhesive interface through shear testing on 85 3D-printed resin discs for occlusal devices. Each disc, measuring 18mm in diameter by 3mm in thickness, underwent three distinct repairs using various resins [Group R: R1 - flow; R2 - bisacrylic; R3 - PMMA] and four different surface treatments (N= 17) [TS Group: TS1 - abrasive paper (CONTROL); TS2 - abrasive paper + alcohol; TS3 - abrasive paper + silane; TS4 - abrasive paper + aluminum oxide blasting; TS5 - abrasive paper + aluminum oxide blasting + Silane]. After a 24-hour immersion in distilled water at 37°C, the bond strength data, measured in megapascals (MPa), underwent a two-factor Analysis of Variance (ANOVA) considering both surface treatment and repair material as factors. Post hoc analysis was conducted using the Tukey test, and a significance level of 5% was applied to determine statistical differences among the groups. Results: the factors of surface treatment, repair material, and their interaction significantly influenced the outcomes (p<0.001). In the control group, no statistically significant difference was observed among the various repair materials assessed. However, when considering surface treatments involving abrasive paper + alcohol or abrasive paper + aluminum oxide blasting, the flow resin (P< 0,05) demonstrated superior performance for repair. Additionally, more favorable results were evident in the abrasive paper + silane and abrasive paper + aluminum oxide blasting + silane groups, particularly when opting for bisacrylic resin (P< 0,05) or flow resin (P< 0,05) as the chosen repair materials. Conclusion: resinous materials, specifically bisacrylic and flow resins, exhibited superior repair performance, particularly in groups subjected to silanization as a surface treatment. This bond strength increase was notably pronounced when a combination of mechanical treatment (aluminum oxide blasting) and chemical treatment (silane) was applied.”

COMMITTEE MEMBERS:
Externa à Instituição - KARINA HELGA TURCIO DE CARVALHO - UNESP
Interna - 3493627 - FERNANDA CRISTINA PIMENTEL GARCIA
Interno - 3157955 - LEONARDO FERNANDES DA CUNHA
Presidente - 1877052 - LILIANA VICENTE MELO DE LUCAS REZENDE