Banca de DEFESA: MARCELA EMÍLIO DE ARAÚJO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MARCELA EMÍLIO DE ARAÚJO
DATE: 09/07/2024
TIME: 08:30
LOCAL: Auditório do Departamento de Odontologia
TITLE:

EVALUATION OF THE EFFECTIVENESS OF BLUE LIGHT FILTERS IN PROTECTING ON RETINAS EXPOSED TO HIGH POWER LED EMITTING DIODE: AN IN VIVO STUDY

KEY WORDS:

Dentistry, Dental curing lights, Occupational Injuries, Retina, Wistar Rats, Protective equipment.

PAGES: 63
BIG AREA: Ciências da Saúde
AREA: Odontologia
SUBÁREA: Ortodontia
SUMMARY:

Objective: To evaluate the ocular effects of blue light emitted by a high-power LED curing device on the retina of Wistar rats protected by a blue light filter. Materials and methods: Nine Wistar rats were used in the research, and their ocular structures were the subjects of study. The animals were divided into three groups (n = 6 ocular structures each): GC – control group (without exposure); GEP - exposure over the protection filter of the VALO^® curing; GEI - indirect exposure without protection filter. During the photostimulation of each animal, the eye considered experimental was exposed to the indirect light of the high-intensity LED at 3200mW/cm² (Valo Ortho - Ultradent) for 144 seconds at 30cm. The animals were exposed to the LED light three times a day to investigate if any acute inflammatory changes occurred in the retina. Seven days after the photostimulation sessions, the animals were anesthetized and euthanized. Subsequently, the eyes were dissected and histologically processed. The histological slides were analyzed stereologically and histomorphometrically to measure the investigated retinal parameters. Results: There was a statistically significant increase in the total volume of the retina in the group exposed to unprotected light due to the increased volume of ganglion cell layers (GCL), inner plexiform layers (IPL), outer nuclear layers (ONL), and the extensions of rods and cones. There was no statistically significant difference in terms of density. However, there was a statistically significant increase in the nuclear area of cells in all studied layers in the group exposed to high-intensity unprotected LED light. Conclusion: Exposure to LED light emitted by a dental curing device causes damage to the animal retina structure, and the use of a protective filter can prevent damage caused by exposure.

 

COMMITTEE MEMBERS:
Interno - 1009536 - SERGEI GODEIRO FERNANDES RABELO CALDAS
Externa ao Programa - 3342241 - ARIANE SALGADO GONZAGA - UFRNExterno ao Programa - 1076490 - FERNANDO VAGNER LOBO LADD - UFRNExterno à Instituição - RICARDO CÉSAR MORESCA - UFPR
Externa à Instituição - CLÁUDIA TRINDADE MATTOS - UFF