Effectiveness of methods for cleaning arch wire: an in vitro study

The aim of this study was to evaluate various methods of removing bacterial and fungus biofilm, to simulate orthodontic arch wires cleaning before reinsertion in the patients appliance. Rectangular Nickel Titanium (NiTi), Stainless Steel (SS) and Titanium Molybdenum (TMA) wires were divided into five groups, then contaminated with strains of Streptococcus mutans and Candida albicas. Four segments of each group served as control and were not contaminated. Six cleanings methods were used to remove the biofilm: cotton roll and a chemical agent (chlorhexidine, sodium hypochlorite, 70% alcohol), cotton roll and water, steel woll and immersion on enzymatic detergent. There was a control group not decontaminated Then wires were placed in broth separately, and after an incubation period the optical density (OD) was measured, observing whether there was microbial growth. A wire segment of each subgroup of SS 3M® was taken to the Scanning Electron Microscope (SEM) for visualization of the treatment response. The results were submitted to one-way ANOVA test and Tukey post-test. With the exception of 70% alcohol, the disinfection means behaved similarly regardless the type of wire. Two percent Chlorhexidine and 1% Sodium Hypochlorite totally removed the microorganisms while other agents left a high microbial concentration. Chemical cleaning is necessary to remove biofilm in orthodontic wires; 1% Sodium Hypochlorite and 2% Chlorhexidine are good disinfectants for this purpose.

Quantification of Streptococcus mutans in Different Types of Ligature Wires and Elastomeric Chains.

This study aimed to test the hypothesis that Streptococcus mutans contamination levels differ according to the type of the orthodontic ligature. Thirteen patients were selected. Each quadrant was randomly subjected to one of the following ligature-use protocols: I) elastomeric chain, II) steel ligature crossed over the archwire, III) steel ligature crossed under the archwire, and IV) steel ligature in a figure-eight pattern under the archwire. After seven days, the devices were removed and the Streptococcus mutans colony-forming unit count per mg of biofilm weight was determined. Twelve specimens (n=3) were also processed for scanning electron microscopy analysis. ANOVA and Tukey-Kramer test were used for comparisons to assess S. mutans differences between groups at a 5% significance level. There was no statistical difference in detectable levels of S. mutans among the groups (p=0.294). Scanning electron microscopy results showed abundant biofilms and microbial contamination in all groups. In conclusion, S. mutans contamination levels are similar in the different orthodontic ligatures.

Quantification of Streptococcus mutans in Different Types of Ligature Wires and Elastomeric Chains

Abstract This study aimed to test the hypothesis that Streptococcus mutans contamination levels differ according to the type of the orthodontic ligature. Thirteen patients were selected. Each quadrant was randomly subjected to one of the following ligature-use protocols: I) elastomeric chain, II) steel ligature crossed over the archwire, III) steel ligature crossed under the archwire, and IV) steel ligature in a figure-eight pattern under the archwire. After seven days, the devices were removed and the Streptococcus mutans colony-forming unit count per mg of biofilm weight was determined. Twelve specimens (n=3) were also processed for scanning electron microscopy analysis. ANOVA and Tukey-Kramer test were used for comparisons to assess S. mutans differences between groups at a 5% significance level. There was no statistical difference in detectable levels of S. mutans among the groups (p=0.294). Scanning electron microscopy results showed abundant biofilms and microbial contamination in all groups. In conclusion, S. mutans contamination levels are similar in the different orthodontic ligatures.

Resumo Este estudo teve como objetivo testar a hipótese de que os níveis de contaminação de Streptococcus mutans diferem de acordo com o tipo de ligadura ortodôntica. Treze pacientes foram selecionados. Cada quadrante foi submetido aleatoriamente a um dos seguintes protocolos de uso de ligadura: I) ligadura elastomérica, II) ligadura de aço trançada sobre o arco, III) ligadura de aço trançada sob o arco e IV) ligadura de aço em um padrão de "oito" sob o arco. Após sete dias, os dispositivos foram removidos e a contagem das unidades formadoras de colônia de S. mutans por mg de peso de biofilme foi determinada. Doze espécimes (n = 3) também foram processados para análise por microscopia eletrônica de varredura. Análise de variância e teste de Tukey-Kramer foram utilizados para comparações a fim de avaliar as diferenças de níveis de S. mutans entre os grupos com significância de 5%. Não houve diferença estatisticamente significante em níveis detectáveis de S. mutans entre os grupos (p = 0,294). Os resultados da microscopia eletrônica de varredura mostraram biofilmes abundantes e contaminação microbiana em todos os grupos. Em conclusão, os níveis de contaminação de S. mutans são semelhantes nas diferentes ligaduras ortodônticas.

Effect of time and pH on physical-chemical properties of orthodontic brackets and wires.

OBJECTIVE: To test the hypothesis that treatment time, debris/biofilm, and oral pH have an influence on the physical-chemical properties of orthodontic brackets and arch wires. MATERIALS AND METHODS: One hundred twenty metal brackets were evaluated. They were divided into four groups (n  =  30) according to treatment time: group C (control) and groups T12, T24, and T36 (brackets recovered after 12, 24, and 36 months of treatment, respectively). Rectangular stainless-steel arch wires that remained in the oral cavity for 12 to 24 months were also analyzed. Dimensional stability, surface morphology, composition of brackets, resistance to sliding of the bracket-wire set, surface roughness of wires, and oral pH were analyzed. One-way analysis of variance, followed by a Tukey multiple comparisons test, was used for statistical analysis (P < .05). RESULTS: Carbon and oxygen were shown to be elements that increased expressively and in direct proportion to time, and there was a progressive increase in the coefficient of friction and roughness of wires as a function of time of clinical use after 36 months. Oral pH showed a significant difference between group T36 and its control (P  =  .014). CONCLUSIONS: The hypothesis was partially accepted: treatment time and biofilm and debris accumulation in bracket slots were shown to have more influence on the degradation process and frictional force of these devices than did oral pH.

Monitoreo bacteriológico del instrumental utilizado en la práctica clínica de ortodoncia / Bacteriologic monitoring of the instruments used in orthodontic clinical practice

El objetivo del trabajo fue verificar la efectividad de procedimientos de esterilización en el instrumental de ortodoncia el objetivo del trabajo fue verificar la efectividad de procedimientos de esterilización en instrumental de ortodoncia. Seesterilizaron 10 juegos de instrumentos compuestos por alicates How recto, alicates Weingart, alicates de corte, retractores acrílicos, bastones de ligaduras elastoméricas y rollos decadenas elastoméricas. esterilización previa al trabajo: en autoclavelos alicates, en óxido de etileno los elementos plásticos y elastoméricos. Post esterilización in situ: alicates enesterilizador a bolitas de cuarzo; elementos elastoméricos y plásticos aerolizados en glutaraldehido al 2 por ciento. Se tomaron muestras con tubos de hisopos estériles, en dos momentos, 1: previo a la atención al paciente y 2: después de esterilización in situ. los tubos con turbidez macroscópica se colorearon con gram y cultivaron en medios de maC ConKey y Clde. Para cuantificar la carga microbiana, se realizaron tres siembras por estrías con ansa calibrada. momento 1: se encontrócontaminación con Corynebacterium en alicates Weingart y con Staphylococcus coagulasa negativo en los rollosde cadena.momento 2: contaminación con Corynebacterium en retractores; con Staphylococcus coagulasa negativo en alicates de corte, en retractores acrílicos, en bastones de ligadura;con Micrococcus en alicates How rectos. La presencia de cargas bacterianas no satisfactorias sugiere que los procedimientos habituales de esterilización no fueron eficaces.

Monitoreo bacteriológico del instrumental utilizado en la práctica clínica de ortodoncia / Bacteriologic monitoring of the instruments used in orthodontic clinical practice

El objetivo del trabajo fue verificar la efectividad de procedimientos de esterilización en el instrumental de ortodoncia el objetivo del trabajo fue verificar la efectividad de procedimientos de esterilización en instrumental de ortodoncia. Seesterilizaron 10 juegos de instrumentos compuestos por alicates How recto, alicates Weingart, alicates de corte, retractores acrílicos, bastones de ligaduras elastoméricas y rollos decadenas elastoméricas. esterilización previa al trabajo: en autoclavelos alicates, en óxido de etileno los elementos plásticos y elastoméricos. Post esterilización in situ: alicates enesterilizador a bolitas de cuarzo; elementos elastoméricos y plásticos aerolizados en glutaraldehido al 2 por ciento. Se tomaron muestras con tubos de hisopos estériles, en dos momentos, 1: previo a la atención al paciente y 2: después de esterilización in situ. los tubos con turbidez macroscópica se colorearon con gram y cultivaron en medios de maC ConKey y Clde. Para cuantificar la carga microbiana, se realizaron tres siembras por estrías con ansa calibrada. momento 1: se encontrócontaminación con Corynebacterium en alicates Weingart y con Staphylococcus coagulasa negativo en los rollosde cadena.momento 2: contaminación con Corynebacterium en retractores; con Staphylococcus coagulasa negativo en alicates de corte, en retractores acrílicos, en bastones de ligadura;con Micrococcus en alicates How rectos. La presencia de cargas bacterianas no satisfactorias sugiere que los procedimientos habituales de esterilización no fueron eficaces.(AU)

Biofilm retention by 3 methods of ligation on orthodontic brackets: a microbiologic and optical coherence tomography analysis.

INTRODUCTION: The aim of this study was to evaluate biofilm retention around orthodontic brackets related to the method of ligation by using optical coherence tomography (OCT) and microbiologic sampling. METHODS: Seventy-five plastic central incisors for dentures were divided into 3 groups and used with metal brackets with a 0.022-in slot with elastomeric ligature (n = 25), metal brackets with a 0.022-in slot with steel wire ligature (n = 25), and self-ligating brackets with a 0.022-in slot (n = 25). The samples were submersed in a suspension of Streptococcus mutans, genetically engineered to express green fluorescent protein, at 37°C for 72 hours to allow biofilm formation. The samples were then submitted to microbiologic analysis and OCT imaging. RESULTS: The microbiologic analysis and the OCT showed significant differences in biofilm formation depending on the ligating method. Brackets ligated with elastomeric rings held more S mutans biofilm, and steel wire ligation had less biofilm retention compared with the other brackets. CONCLUSIONS: This study provided validation that OCT can be used as a potential qualitative marker of total plaque bacteria that can be rapidly and reliably visualized around orthodontic brackets.

Periodontal and microbiologic evaluation of 2 methods of archwire ligation: ligature wires and elastomeric rings.

INTRODUCTION: Prophylactic programs to prevent dental biofilm accumulation must be implemented to minimize the risk for periodontal diseases in orthodontic patients. Therefore, we assessed the possible periodontal and microbiologic changes resulting from the use of 2 methods of orthodontic archwire ligation: elastomeric rings and steel ligatures. METHODS: The following parameters were measured: plaque index, gingival bleeding index, probing depth, and biofilm samples from the maxillary second premolars and the mandibular lateral incisors were evaluated in 14 subjects without clinical signs of gingival inflammation before orthodontic appliance placement and after 6 months of treatment. Each orthodontic arch was fixed with elastomeric rings on 1 side of the midline, and steel ligatures were used on the opposite side. Polymerase chain reaction analysis was used to detect Porphyromonas gingivalis, Tannerella forsythia, Actinobacillus actinomycetemcomitans, Prevotella intermedia, and P nigrescens. RESULTS: The elastomeric rings were associated with a higher score for plaque index and bleeding than steel ligatures, as well as many positive sites of T forsythia and P nigrescens (P <0.05). CONCLUSIONS: Elastomeric rings favored these 2 periodontopathogens and harmed gingival conditions.