Banca de QUALIFICAÇÃO: MONIQUE RODRIGUES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MONIQUE RODRIGUES
DATE: 24/03/2023
TIME: 14:00
LOCAL: remota - https://conferenciaweb.rnp.br/webconf/patricia-16
TITLE:

Q-SWITCHED LASERS IN THE REMINERALIZATION OF RADICULAR RADIATION CARIES: EFFECTS OF WAVELENGTH, ASSOCIATION WITH FLUORIDE OR VITROCERAMIC

PAGES: 152
BIG AREA: Engenharias
AREA: Engenharia Biomédica
SUBÁREA: Engenharia Médica
SPECIALTY: Instrumentação Odontológica e Médico-Hospitalar
SUMMARY:

Radiation caries is one of the most prevalent complications of head and neck radiotherapy, and its rapid progression can lead to tooth loss within a few months. To prevent its development and progression, strategies such as professional application of fluoride, use of mouthwashes with fluoride or chlorhexidine, as well as remineralizing toothpastes have proven to be efficient. However, this requires a lot of patient cooperation, which can be difficult in patients undergoing rehabilitation. Thus, strategies that modify the structure of dental tissue, such as the use of high-intensity lasers, are promising. Also, some biomaterials, such as glass ceramics, can also be efficient in this process due to the formation of carbonated hydroxyapatite on the surfaces. Therefore, the present in vitro study aimed to evaluate the action of the Q-switched Nd:YAG laser (with a pulse duration of 5 ns), emitted in the infrared (1064 nm) or ultraviolet (355 nm), either alone or in combination with the application of acidulated fluorine phosphate (AFF) or Biosilicate®, in the remineralization of incipient lesions of root radiation caries. To this end, blocks of healthy bovine root dentin were used, submitted to in vitro radiotherapy and then demineralized for 32 hours for the development of incipient caries lesions. To carry out the treatments, the samples were distributed into 9 experimental groups and then the remineralization activation was done through pH cycling lasting 8 days. Sample evaluations were performed by Fourier transform infrared absorption spectroscopy (FTIR), optical coherence tomography (OCT) and scanning electron microscopy (SEM) at two different times: before and after pH cycling. For all response variables, statistical analysis was performed at a significance level of 5%. It was observed that both lasers alone modify the dentin microstructure, such as changes in the organic and inorganic matrix, as well as melting and resolidification of the dentin surface; however, the modifications are more evident when using the 1064nm wavelength. In association with Biosilicate®, laser radiation increased its bioactivity and, as a consequence, the formation of carbonated hydroxyapatite. The association of laser irradiation, either with Biosilicate® or with FFA, increased the remineralization of incipient caries lesions. Therefore, it was possible to conclude that the Q-switched Nd:YAG laser can increase the Biosilicate® bioactivity, as well as modify the microstructure of the irradiated dentin. For this, the wavelength of 1064 nm is recommended.

COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 2090031 - ILKA TIEMY KATO PRATES
Membro Titular - Examinador(a) Externo ao Programa - 1764396 - CHRISTIANE RIBEIRO
Membro Titular - Examinador(a) Externo à Instituição - CRISTIANE DE ALMEIDA BALDINI CARDOSO - UNICSUL
Membro Suplente - Examinador(a) Interno ao Programa - 1764675 - CHRISTIANE BERTACHINI LOMBELLO
Membro Suplente - Examinador(a) Externo ao Programa - 2297271 - CAROLINA BENETTI