Banca de DEFESA: RAFAELA MONTEIRO DE ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RAFAELA MONTEIRO DE ARAÚJO
DATA : 10/12/2018
HORA: 09:30
LOCAL: Departamento de Odontologia da UFRN
TÍTULO:

EVALUATION OF TENSILE STRENGTH WITH DIFFERENT TYPES OF SURGICAL FIXATION HOOK PREFABRICATED ON ORTHODONTICS WIRES

PALAVRAS-CHAVES:

Tensile strength, Surgical instruments, Orthognathic surgery.

PÁGINAS: 72
GRANDE ÁREA: Ciências da Saúde
ÁREA: Odontologia
SUBÁREA: Ortodontia
RESUMO:

OBJECTIVES: This research was realized in vitro assay to evaluate the traction resistance of prefabricated surgical hook, threaded prefabricated hooks, hooks made of stainless-steel wire and surgical hook made of brass wire comparing different ways of fixing them and different commercial brands. MATERIAL AND METHODS: The sample consisted of 340 segments of orthodontic wire associated to surgical hooks divided into 34 groups. One of them was the control group with 10 hooks made of brass wire fixated with silver weld and the others 33 experimental groups were composed of 10 surgical hooks in each group. In 25 groups, the hooks were prefabricated, fixed to the orthodontic wires by means of manual pressure made with appropriate pliers associated to different quantities of electric welding points. In one group, the pressure was performed with heavy-cut pliers and in another group the base of the hook was distempered and then the pressure was made with appropriate orthodontic pliers. The brands compared were Morelli, TP orthodontics, American Orthodontics and MAO MidAtlantic Ortho and the types of fixation were manual pressure made with appropriate pliers and manual pressure associated with 2,3,4 and 5 point of electric solder. In 5 groups, the hooks were made of stainless-steel wire, one group being fixed with silver solder or with 1, 2, 3, and 4 electric soldering points respectively. The last group consisted of 10 threaded surgical hooks. Topography of the sample was evaluated by scanning electron microscopy before and after the experiment. The Kruskal-Wallis and Mann-Whitney analyzes were used to compare the groups at a significance level of 0.05 to identify the differences between the measures of each group. RESULTS: The control group was better than all the other groups (p <0.0001 / Kruskal-Wallis). The group of steel hooks was independent of the control group (p <0.0001 / Kruskal-Wallis). American Orthodontics hooks were also found in relation to the other brands, regardless of the form of fixation (p <0.05 / Mann-Whitney). The rosquetics were those that improved with the difference between them (p <0.05 / Mann-Whitney). CONCLUSIONS: There was no increase in the resistance of the pressable hooks when different solder exposure points were saved. The best mark was an American Orthodontics. Welding wire hooks with soldering points have the same efficacy to welding with silver soldering, and can replace them. The threaded hooks are successful results with the clips.

MEMBROS DA BANCA:
Presidente - 2665455 - HALLISSA SIMPLICIO GOMES PEREIRA
Interno - 1009536 - SERGEI GODEIRO FERNANDES RABELO CALDAS
Externo à Instituição - LEONARDO EULER ANDRADE GOMES DO NASCIMENTO - UESPI