Efeitos de diferentes tratamentos de braquetes cerâmicos na resistência de união à resina para colagem ortodôntica
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Data
2021-07-08
Autores
Barbosa, Alexandre Reis Costa Murad
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Uma adesão estável e duradoura entre a superfície do braquete cerâmico e a resina para colagem ortodôntica define o sucesso do tratamento ortodôntico. Clinicamente, no entanto, ainda se observa falha adesiva recorrente desses braquetes; o que torna essa adesão um desafio na Ortodontia atual. O objetivo do estudo foi investigar a efetividade de três novos tratamentos da base de braquetes cerâmicos na resistência de união, imediata e após envelhecimento, à resina para colagem ortodôntica: (1) aplicação de plasma atmosférico não térmico (PA), (2) deposição por camadas atômicas (ALD) e (3) infiltração de vidro (IV). Foram utilizados 48 terceiros molares humanos, faces vestibular e lingual, divididos em 8 grupos de acordo com o tratamento e o tempo de armazenamento, imediato (48h) e tardio (após envelhecimento artificial acelerado): grupo BCI, grupo controle, teste imediato; grupo BCT grupo controle, teste tardio; grupo PAI, aplicação do plasma por 1minuto, teste imediato; grupo PAT, aplicação do plasma por 1minuto, teste tardio; grupo ALDI, deposição da camada atômica de dióxido de titânio, teste imediato; grupo ALDT, deposição da camada atômica de dióxido de titânio, teste tardio; grupo IVI, infiltração de vidro, teste imediato; e, grupo IVT, infiltração de vidro, teste tardio. Após os tratamentos, os braquetes foram colados nas áreas delimitadas do esmalte das faces dos dentes com a resina ortodôntica (Transbond XT Plus 3M) e testados quanto à resistência de união ao cisalhamento nos tempos estipulados. Os dados foram submetidos a Anova 2 fatores de medidas repetidas e teste de Tukey (5%). Os valores médios obtidos de resistência de união em Mpa foram: BRI: 13,75; PAI: 15,66; ALDI: 9,73; IVI:13,65 e BRT: 5,71; PAT: 4,36; ALDT: 4,74 IVT: 5,58. Não houve diferença estatisticamente significante entre os grupos, independente do tempo; porém houve diferença estatisticamente significante entre os tempos (imediato e tardio); com a resistência de união apresentando redução significativa após o envelhecimento. Os espécimes foram analisados em esteromicroscópio, sendo constatada fratura adesiva entre a resina e a superfície do braquete. em todos eles. Os tratamentos não influenciaram na resistência de união da resina para colagem ortodôntica à superfície do braquete cerâmico, sendo que o envelhecimento promoveu redução da resistência de união independentemente do tratamento realizado.
A stable and lasting adhesion between the ceramic bracket and the resin for orthodontic bonding dictates the success of orthodontic treatment. Clinically, however, recurrent adhesive failure of these brackets is still observed, which makes this bonding a challenge in current Orthodontics. The aim of the study was to investigate immediate and long term effectiveness of three new treatments for the base of ceramic brackets in the bond strength to orthodontic bonding resin: (1) application of non-thermal atmospheric plasm (PA), (2) atomic layer deposition (ALD) and (3) glass infiltration (IV). The buccal and lingual surfaces of 48 human third molars were selected and divided into 8 groups according to treatment and storage time, immediate (48h) and late (after accelerated artificial aging): BCI group, control group, immediate test; BCT group, control group, late test; PAI group, plasma application for 1 minute, immediate test; PAT group, plasma application for 1 minute, late test; ALDI group, atomic layer deposition of titanium dioxide, immediate test; ALDT group, atomic layer deposition of titanium dioxide, late test; group IVI, glass infiltration, immediate test, and group IVT, glass infiltration, late test. . After treatments, the brackets were bonded to the delimited enamel surface area of the teeth with the orthodontic bonding resin (Transbond XT Plus 3M) and tested for shear bond strength within the stipulated times. Data were submitted to Two-way Repeated Measures Anova and Tukey's test (5%). The average values obtained for bond strength in Mpa were: BRI: 13.75; PAI: 15.66; ALDI: 9.73; IVI: 13.65 and BRT: 5.71; PAT: 4.36; ALDT: 4.74 IVT: 5.58. There was no statistically significant difference among groups, regardless of time; however, there was a statistically significant difference between the times (immediate and late). The specimens were analyzed in a stereomicroscope, and adhesive fracture was found between the resin and the bracket surface in all of them. The treatments did not influence the bond strength of the bonding resin to the surface of the ceramic bracket, but aging promoted a significant reduction in bond strength regardless of treatment.
A stable and lasting adhesion between the ceramic bracket and the resin for orthodontic bonding dictates the success of orthodontic treatment. Clinically, however, recurrent adhesive failure of these brackets is still observed, which makes this bonding a challenge in current Orthodontics. The aim of the study was to investigate immediate and long term effectiveness of three new treatments for the base of ceramic brackets in the bond strength to orthodontic bonding resin: (1) application of non-thermal atmospheric plasm (PA), (2) atomic layer deposition (ALD) and (3) glass infiltration (IV). The buccal and lingual surfaces of 48 human third molars were selected and divided into 8 groups according to treatment and storage time, immediate (48h) and late (after accelerated artificial aging): BCI group, control group, immediate test; BCT group, control group, late test; PAI group, plasma application for 1 minute, immediate test; PAT group, plasma application for 1 minute, late test; ALDI group, atomic layer deposition of titanium dioxide, immediate test; ALDT group, atomic layer deposition of titanium dioxide, late test; group IVI, glass infiltration, immediate test, and group IVT, glass infiltration, late test. . After treatments, the brackets were bonded to the delimited enamel surface area of the teeth with the orthodontic bonding resin (Transbond XT Plus 3M) and tested for shear bond strength within the stipulated times. Data were submitted to Two-way Repeated Measures Anova and Tukey's test (5%). The average values obtained for bond strength in Mpa were: BRI: 13.75; PAI: 15.66; ALDI: 9.73; IVI: 13.65 and BRT: 5.71; PAT: 4.36; ALDT: 4.74 IVT: 5.58. There was no statistically significant difference among groups, regardless of time; however, there was a statistically significant difference between the times (immediate and late). The specimens were analyzed in a stereomicroscope, and adhesive fracture was found between the resin and the bracket surface in all of them. The treatments did not influence the bond strength of the bonding resin to the surface of the ceramic bracket, but aging promoted a significant reduction in bond strength regardless of treatment.
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Palavras-chave
Adesão, Tratamento de Superficie, Braquetes Cerâmicos, Ceramic brackets, Adhesion, Surface treatment