Banca de DEFESA: Lucas Simino de Melo

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Lucas Simino de Melo
DATE: 22/12/2023
TIME: 13:00
LOCAL: Sala de reuniões 5, Faculdade de Ciências da Saúde, Universidade de Brasília - UnB
TITLE:

Evaluation of shear bond strength of repairing materials for 3D printed occlusal splints

KEY WORDS:

3D Printing; Occlusal splints; Shear strength

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

Recently, Temporomandibular disfunctions and bruxism are common complaints to a large portion of population. Among the treatments, we can highlight the occlusal splints. The materials used to produce occlusal splints, such as acrylic resins or 3D printed resins, presents adequate mechanical properties to control bruxism, however, due to daily use, cracks or small chips may occur, creating the need for repairs. The aim of the present study is to evaluate the shear bond resistance of 4 repairing materials for occlusal splints produced on 3D printers: Flow resin, Selfcuring acrylic resin, Bisacrylic resin and Splint resin for 3D printers. 33 discs with 18mm diameter and 3mm thickness were produced. After polishing, regularizing the surface, and placing the repairing materials, the samples were divided in 2 groups: Group 1 and 2. On group 1, the samples were stored in 32°C distilled water for 24 hours and on Group 2 the samples were thermocycled for 10.000 cycles, alternating 5°C and 55°C water. Afterwards, the shear bond test was performed with a knife-edge load unit, with 5 KN load and 0,5 mm/min crosshead speed until specimen failure. The shear bond strength was recorded, then, converted to tensile bond strength (MPa). A two-way ANOVA (for each material and time) was used, followed by the Tukey test, with a significance level of 5%. After the tests, on group 1, the Bisacrylic resin showed better shear bond strength results (P<0.05), however, this performance did not sustain when the sample was thermocycled. On group 2, all materials, except the Bisacrylic resin, kept the shear bond strength results close to group 1 (P<0.05). The Self-curing acrylic resin displayed the best results when tested on group 1, enhancing them after thermocycling (group 2). Considering the results, we can conclude that, among the materials tested, the Self-curing acrylic resin presented better shear bond strength results and should be eligible for repairing occlusal splints manufactured on Splint resin for 3D printers.

COMMITTEE MEMBERS:
Interna - 3493627 - FERNANDA CRISTINA PIMENTEL GARCIA
Interna - 1877052 - LILIANA VICENTE MELO DE LUCAS REZENDE
Externa à Instituição - MARCELA FILIE HADDAD DANZIGER - UNIFAL-MG
Presidente - 1291230 - RODRIGO ANTONIO DE MEDEIROS