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Are torque values of preadjusted brackets precise?

STREVA, Alessandra Motta; COTRIM-FERREIRA, Flávio Augusto; GARIB, Daniela Gamba; CARVALHO, Paulo Eduardo Guedes
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
37.3%
OBJECTIVE: The aim of the present study was to verify the torque precision of metallic brackets with MBT prescription using the canine brackets as the representative sample of six commercial brands. MATERIAL AND METHODS: Twenty maxillary and 20 mandibular canine brackets of one of the following commercial brands were selected: 3M Unitek, Abzil, American Orthodontics, TP Orthodontics, Morelli and Ortho Organizers. The torque angle, established by reference points and lines, was measured by an operator using an optical microscope coupled to a computer. The values were compared to those established by the MBT prescription. RESULTS: The results showed that for the maxillary canine brackets, only the Morelli torque (-3.33º) presented statistically significant difference from the proposed values (-7º). For the mandibular canines, American Orthodontics (-6.34º) and Ortho Organizers (-6.25º) presented statistically significant differences from the standards (-6º). Comparing the brands, Morelli presented statistically significant differences in comparison with all the other brands for maxillary canine brackets. For the mandibular canine brackets, there was no statistically significant difference between the brands. CONCLUSIONS: There are significant variations in torque values of some of the brackets assessed...

Avaliação da resistência ao deslocamento na sobreposição de fios de níquel e titânio superelásticos termoativados em braquetes autoligáveis passivos; Assessment of the displacement resistance of overlapped heat-activated superelastic nickel titanium wires in passive self-ligating brackets

Galvão, Mariana de Aguiar Bulhões
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 22/08/2014 PT
Relevância na Pesquisa
37.39%
Objetivos: O objetivo desta pesquisa foi comparar a resistência ao deslocamento de fios de níquel e titânio superelásticos termoativados sobrepostos, em braquetes ortodônticos metálicos autoligáveis passivos. Material e Métodos: Foram utilizadas três espessuras de fios de níquel e titânio superelásticos termoativados (NiTi-TA): 0,014 sobreposto ao 0,016 e 0,020 (FlexyNiTi Thermal - Orthometric, Marília, SP, BR), associados a dois tipos de braquetes metálicos autoligáveis passivos: SmartClip SL3® (3M Unitek, Monrovia, CA, EUA) e OrthoClip SLB® (Orthometric, Marília, SP, BR). Um dispositivo que continha 5 braquetes de cada tipo (do incisivo central superior direito ao 2º pré-molar superior direito) foi desenvolvido para realização dos testes. O braquete do canino foi colado em uma barra de aço inoxidável móvel que permitia alterar sua posição vertical, enquanto os demais braquetes foram colados a uma barra fixa de acrílico. As forças obtidas por meio do deslocamento vertical do braquete do canino de 0mm para 1,5mm, 3,0 mm, 4,5mm e 6,0 mm foram registradas. O ambiente de teste foi seco com temperatura controlada de 36,5º C ± 1º C. Um total de 160 testes foi realizado na máquina de ensaios universal Instron. Os testes estatísticos de Shapiro-Wilk...

Staining of esthetic brackets by plaque disclosing solutions

Ismael,Luiza Novelino Acatauassú; Nunes,Mauro de Amorim Acatauassú; Nunes,Ana Maria Novelino Acatauassú; Motta,Rogério Heládio Lopes; Demasi,Ana Paula Dias; Flório,Flávia Martão
Fonte: Faculdade de Odontologia de Piracicaba - UNICAMP Publicador: Faculdade de Odontologia de Piracicaba - UNICAMP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
37.42%
AIM: To evaluate the staining of esthetic orthodontic brackets by plaque disclosing solutions. METHODS: Two types of brackets manufactured by GAC/DENTSPLY(r) were evaluated: ceramic (n=30) and polycarbonate (n=30). The brackets were divided into 6 groups. Two control groups (n=6) were immersed in absolute ethanol: GI - ceramic brackets and GII - polycarbonate brackets. Four experimental groups (n=12) were immersed in different plaque disclosing solutions: GIII (ceramic brackets) and GIV (polycarbonate brackets) were immersed in Replak(r); GV (ceramic brackets) and GVI (polycarbonate brackets) were immersed in Replasul "S"(r). Relative quantitative analysis of the influence of plaque disclosing tablets on bracket staining was performed using reflectance spectrophotometry of stain deposition. Exploratory analysis of the data was performed using Analysis of Variance (ANOVA) in a 2x2 factorial setup (bracket x immersion) with additional treatments (controls). RESULTS: The results demonstrated that the ceramic brackets presented the highest amount of staining when Replasul "S"(r) was used (pd"0.05). However, when Replak(r) was used, no statistically significant difference was found in comparison with the control group (p>0.05). For polycarbonate brackets...

Are torque values of preadjusted brackets precise?

Streva,Alessandra Motta; Cotrim-Ferreira,Flávio Augusto; Garib,Daniela Gamba; Carvalho,Paulo Eduardo Guedes
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2011 EN
Relevância na Pesquisa
37.3%
OBJECTIVE: The aim of the present study was to verify the torque precision of metallic brackets with MBT prescription using the canine brackets as the representative sample of six commercial brands. MATERIAL AND METHODS: Twenty maxillary and 20 mandibular canine brackets of one of the following commercial brands were selected: 3M Unitek, Abzil, American Orthodontics, TP Orthodontics, Morelli and Ortho Organizers. The torque angle, established by reference points and lines, was measured by an operator using an optical microscope coupled to a computer. The values were compared to those established by the MBT prescription. RESULTS: The results showed that for the maxillary canine brackets, only the Morelli torque (-3.33º) presented statistically significant difference from the proposed values (-7º). For the mandibular canines, American Orthodontics (-6.34º) and Ortho Organizers (-6.25º) presented statistically significant differences from the standards (-6º). Comparing the brands, Morelli presented statistically significant differences in comparison with all the other brands for maxillary canine brackets. For the mandibular canine brackets, there was no statistically significant difference between the brands. CONCLUSIONS: There are significant variations in torque values of some of the brackets assessed...

Physical and chemical properties of orthodontic brackets after 12 and 24 months: in situ study

MENDES,Bernardo de Azevedo Bahia; FERREIRA,Ricardo Alberto Neto; PITHON,Matheus Melo; HORTA,Martinho Campolina Rebello; OLIVEIRA,Dauro Douglas
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
37.3%
Objective: The aim of this article was to assess how intraoral biodegradation influenced the surface characteristics and friction levels of metallic brackets used during 12 and 24 months of orthodontic treatment and also to compare the static friction generated in these brackets with four different methods of the ligation of orthodontic wires. Material and Methods: Seventy premolar brackets as received from the manufacturer and 224 brackets that were used in previous orthodontic treatments were evaluated in this experiment. The surface morphology and the composition of the deposits found in the brackets were evaluated with rugosimetry, scanning electron microscopy, and energy dispersive X-ray spectroscopy. Friction was analyzed by applying tensile tests simulating sliding mechanics with a 0.019x0.025" steel wire. The static friction levels produced by the following ligation methods were evaluated: loosely attached steel ligature around all four bracket wings, steel ligature attached to only two wings, conventional elastomeric ligation around all 4 bracket wings, and non-conventional Slide® elastomeric ligature. Results: The results demonstrated the presence of biodegradation effects such as corrosion pits, plastic deformation...

Frictional resistance of self-ligating versus conventional brackets in different bracket-archwire-angle combinations

MONTEIRO,Maria Regina Guerra; SILVA,Licinio Esmeraldo da; ELIAS,Carlos Nelson; VILELLA,Oswaldo de Vasconcellos
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
37.4%
Objective: To compare the influence of archwire material (NiTi, beta-Ti and stainless steel) and brackets design (self-ligating and conventional) on the frictional force resistance. Material and Methods: Two types of brackets (self-ligating brackets - Smartclip, 3M/Unitek - and conventional brackets - Gemini, 3M/Unitek) with three (0, 5, and 10 degrees) slot angulation attached with elastomeric ligatures (TP Orthodontics) were tested. All brackets were tested with archwire 0.019"x0.025" nickel-titanium, beta-titanium, and stainless steel (Unitek/3M). The mechanical testing was performed with a universal testing machine eMIC DL 10000 (eMIC Co, Brazil). The wires were pulled from the bracket slots at a cross-head speed of 3 mm/min until 2 mm displacement. Results: Self-ligating brackets produced significantly lower friction values compared with those of conventional brackets. Frictional force resistance values were directly proportional to the increase in the bracket/ wire angulation. With regard to conventional brackets, stainless steel wires had the lowest friction force values, followed by nickel-titanium and beta-titanium ones. With regard to self-ligating brackets, the nickel-titanium wires had the lowest friction values, significantly lower than those of other materials. Conclusion: even at different angulations...

Evaluation of frictional forces between ceramic brackets and archwires of different alloys compared with metal brackets

Guerrero,Ariana Pulido; Guariza Filho,Odilon; Tanaka,Orlando; Camargo,Elisa Souza; Vieira,Sérgio
Fonte: Sociedade Brasileira de Pesquisa Odontológica - SBPqO Publicador: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2010 EN
Relevância na Pesquisa
37.35%
The aim of this study was to evaluate, in vitro, frictional forces produced by ceramic brackets and arch wires of different alloys. Frictional tests were performed on three ceramic brackets: monocrystalline (Inspire ICE), polycrystalline (InVu), polycrystalline with metal slot (Clarity), and one stainless steel bracket (Dyna-Lock). Thirty brackets of each were tested, all with .022" slots, in combination with stainless steel and nickel-titanium wires .019" × .025", at 0° and 10° angulation, in artificial saliva. Arch wires were pulled through the slots at a crosshead speed of 10 mm/min. There were statistically significant differences between the groups of brackets and wires studied (p < .05). The polycrystalline brackets with metal slots had values similar to those of conventional polycrystalline brackets, and the monocrystalline brackets had the highest frictional forces. The nickel-titanium wires produced the lowest friction. The addition of metal slots in the polycrystalline brackets did not significantly decrease frictional values. Nickel-titanium wires produced lower friction than those of stainless steel.

Assessment of surface friction of self-ligating brackets under conditions of angulated traction

Buzzoni,Roberta; Elias,Carlos N.; Fernandes,Daniel J.; Miguel,José Augusto M.
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2012 EN
Relevância na Pesquisa
37.39%
OBJECTIVE: The aim of this study was to assess resistance to sliding of stainless steel passive self-ligating brackets with 0° and 2.5° angulations and to compare them to active self-ligating brackets at zero angulation. The hypothesis to be tested was that passive self-ligating brackets produce lower frictional forces than active self-ligating brackets. METHODS: Twenty five 0.022 x 0.028-in slot maxillary canine brackets were divided into 5 groups of 5 brackets: Damon SL II (Ormco, CA, USA) self-ligating bracket and Gemini (3M/Unitek, CA, USA) conventional bracket with angulation of 0 and 2.5° and a group of Speed 2 (American Orthodontics, WI, USA) active clip self-ligating system with zero angulation. Twenty five segments of stainless steel 0.020-in archwire (TP Orthodontics, IN, USA) were tested and each bracket/wire interface was evaluated at 4 successive points during sliding. Overall, 100 frictional values were analyzed by parametric analysis of variance and Bonferroni tests. RESULTS AND CONCLUSION: Frictional tests were performed with an Emic DL 10000 testing machine (Emic, Brazil) with a load cell of one kilogram. Passive self-ligating brackets produced lower frictional forces than active self-ligating brackets (p < 0.01). Under angulation...

Evaluation of the friction force generated by monocristalyne and policristalyne ceramic brackets in sliding mechanics

Pimentel,Roberta Ferreira; Oliveira,Roberto Sotto Maior Fortes de; Chaves,Maria das Graças Afonso Miranda; Elias,Carlos Nelson; Gravina,Marco Abdo
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2013 EN
Relevância na Pesquisa
37.37%
OBJECTIVE: To evaluate and compare "in vitro" the maximum friction force generated by three types of esthetic brackets, two types of polycrystalline conventional ceramic brackets (20/40 and InVu) and one type of sapphire monocrystalline bracket (Radiance) in dry and artificial saliva wet settings. Also, to evaluate the influence exerted by artificial saliva on the friction forces of those brackets. METHODS: Tests were performed in dry and artificial saliva wet setting (Oral Balance) by using an EMIC DL 10000 testing machine, simulating a 2 mm slide of 0.019 x 0.025-in rectangular stainless steel wires over the pre-angulated and pre-torqued (right superior canine, Roth prescription, slot 0.022 x 0.030-in) brackets (n = 18 for each bracket). In order to compare groups in dry and wet settings, the ANOVA was used. For comparisons related to the dry versus wet setting, the student t test was used for each group. RESULTS: The results showed that in the absence of saliva the Radiance monocrystalline brackets showed the highest friction coefficients, followed by the 20/40 and the InVu polycrystalline brackets. In tests with artificial saliva, the Radiance and the 20/40 brackets had statistically similar friction coefficients and both were greater than that presented by the InVu brackets. The artificial saliva did not change the maximum friction force of the Radiance brackets...

Corrosion behavior of self-ligating and conventional metal brackets

Maia,Lúcio Henrique Esmeraldo Gurgel; Lopes Filho,Hibernon; Ruellas,Antônio Carlos de Oliveira; Araújo,Mônica Tirre de Souza; Vaitsman,Delmo Santiago
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2014 EN
Relevância na Pesquisa
37.33%
Objective: To test the null hypothesis that the aging process in self-ligating brackets is not higher than in conventional brackets. Methods: Twenty-five conventional (GN-3M/Unitek; GE-GAC; VE-Aditek) and 25 self-ligating (SCs-3M/Unitek; INs-GAC; ECs-Aditek) metal brackets from three manufacturers (n = 150) were submitted to aging process in 0.9% NaCl solution at a constant temperature of 37 ± 1ºC for 21 days. The content of nickel, chromium and iron ions in the solution collected at intervals of 7, 14 and 21 days was quantified by atomic absorption spectrophotometry. After the aging process, the brackets were analyzed by scanning electron microscopy (SEM) under 22X and 1,000X magnifications. Results: Comparison of metal release in self-ligating and conventional brackets from the same manufacturer proved that the SCs group released more nickel (p < 0.05) than the GN group after 7 and 14 days, but less chromium (p < 0.05) after 14 days and less iron (p < 0.05) at the three experimental time intervals. The INs group released less iron (p < 0.05) than the GE group after 7 days and less nickel, chromium and iron (p < 0.05) after 14 and 21 days. The ECs group released more nickel, chromium and iron (p < 0.05) than the VE group after 14 days...

Influ??ncia de br??quetes e tipos de ligadura no ac??mulo microbiano e na desmineraliza????o do esmalte adjacente a dispositivos ortod??nticos; Influence of brackets and types of ligation in plaque accumulation and on enamel demineralization adjacent to orthodontic appliances

PACCE, Marcos Antonio
Fonte: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR Publicador: Universidade Federal de Pelotas; Odontologia; Programa de P??s-Gradua????o em Odontologia; UFPel; BR
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
37.45%
The orthodontic treatment has been related to caries lesions development, since the devices used are biofilm retentive. This thesis aimed to evaluate the effect of ligation type and type of orthodontic bracket in the mineral loss and biofilm accumulation to these devices. To accomplish this goal, three studies were conducted. The first study consisted in a systematic literature review, where electronic databases (PubMed, Embase, Cochrane Central Register of Controlled Trials, ISI Web of Knowledge, TRIP, Scopus, and SciELO) were searched up to July 2011. Clinical trials or in situ studies that assessed the effect of types of brackets or ligatures on biofilm accumulation and/or enamel demineralization were selected. Non-controlled studies, in vitro studies, or studies not reporting on the established outcomes were excluded. The second study assessed the enamel demineralization around six types of brackets/archwire ligation combinations. In that study, microcosm plaque biofilms were grown in 24-well microplates on enamel discs for 14 days in artificial saliva. Growth condition comprised cariogenic challenge. The groups (n=10 per group) were: self-ligating brackets (SL); conventional brackets ligated with stainless steel wires (CW); conventional brackets (CE)...

Compósitos cerâmicos alumina-zircônia para aplicação em bráquetes estéticos de ortodontia; Ceramic composites alumina-zirconia for application in orthodontic aesthetic brackets

Fabiano Costa Almeida
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 20/02/2015 PT
Relevância na Pesquisa
37.33%
Os bráquetes são suportes utilizados pelos ortodontistas para controlar o posicionamento dos dentes nos tratamentos ortodônticos. Por eles, mais precisamente por seus slots, passam os fios ortodônticos e ambos são responsáveis pela biomecânica dos movimentos. O bráquete pode ser confeccionado por diversos materiais, sendo o mais comum o metal pela praticidade, preço e resistência. Recentemente, com a maior demanda por aparelhos estéticos, devido ao aumento de adultos utilizando estes dispositivos, aumentou o uso de bráquetes estéticos, feitos geralmente de polímeros ou cerâmicas. As maiores dificuldades encontradas estão relacionadas a estética, resistência, capacidade de coloração por alimentos e maior atrito com o fio. O propósito deste estudo foi a obtenção de compósitos cerâmicos de alumina e zircônia (ZTA) a partir de pós finamente cominuídos em diferentes proporções 70/30, 80/20 e 90/10 provenientes de materiais cerâmicos de alumina e zircônia separadamente. Os compósitos cerâmicos (ZTA) foram submetidos a processos de análises do tamanho de partículas, moagens, prensagens, conformações de corpos de provas (c.p.), difração de raio X, ensaios de compressão diametral, análises das propriedades mecânicas...

Avaliação clinica e laboratorial da colagem de braquetes metalicos com compositos ortodonticos; Clinical and laboratory evaluation of metallic brackets bonded with orthodontic composites

Fabio Lourenço Romano
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 23/04/2009 PT
Relevância na Pesquisa
37.33%
O objetivo neste estudo foi avaliar clinicamente e em laboratório, a taxa de descolagem e a resistência ao cisalhamento de bráquetes metálicos colados com compósitos ortodônticos. O experimento clínico consistiu de 20 pacientes (10,5-15,1 anos de idade), que procuraram tratamento ortodôntico corretivo. Nestes pacientes foram colados bráquetes de 2° pré-molar a 2° pré-molar no arco superior e inferior com os sistemas adesivos: Concise Ortodôntico, Transbond XT convencional, Transbond XT sem agente de união e Transbond XT em esmalte preparado com ácido-primer Transbond Plus Self Etching Primer (TPSEP). Todos os sistemas foram utilizados em todos os pacientes, em rodízio pelos quadrantes, sendo que, a mesma sequência de colagem se repetiu em cada cinco pacientes. Arcos iniciais foram inseridos uma semana após a colagem dos bráquetes. Os pacientes foram avaliados durante seis meses para quantificar o número de bráquetes descolados. Ao final do período de observação ocorreram 8 descolagens com Concise Ortodôntico, 2 com Transbond XT convencional, 9 com Transbond XT sem agente de união e 1 com TPSEP + Transbond XT. Pelo Método de Kaplan-Meier foram encontradas diferenças estatísticas significantes na taxa de descolagem entre os materiais (P=0...

Shear bond strength of new and recycled brackets to enamel

Tavares,Stenyo Wanderley; Consani,Simonides; Nouer,Darcy Flávio; Magnani,Maria Beatriz Borges de Araújo; Nouer,Paulo Roberto Aranha; Martins,Laura Moura
Fonte: Fundação Odontológica de Ribeirão Preto Publicador: Fundação Odontológica de Ribeirão Preto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2006 EN
Relevância na Pesquisa
37.39%
The purpose of this study was to evaluate in vitro the shear bond strength of recycled orthodontic brackets. S2C-03Z brackets (Dental Morelli, Brazil) were bonded to the buccal surfaces of 50 extracted human premolars using Concise Orthodontic chemically cured composite resin (3M, USA). The teeth were randomly assigned to 5 groups (n=10), as follows. In group I (control), the bonded brackets remained attached until shear testing (i.e., no debonding/rebonding). In groups II, III and IV, the bonded brackets were detached and rebonded after recycling by 90-mum particle aluminum oxide blasting, silicon carbide stone grinding or an industrial process at a specialized contractor company (Abzil-Lancer, Brazil), respectively. In group V, the bonded brackets were removed and new brackets were bonded to the enamel surface. Shear bond strength was tested in an Instron machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. There was no statistically significant difference (p>0.05) between the control brackets (0.52 kgf/mm²), brackets recycled by aluminum oxide blasting (0.34 kgf/mm²) and new brackets attached to previously bonded teeth (0.43 kgf/mm²). Brackets recycled by the specialized company (0.28 kgf/mm²) and those recycled by silicon carbide stone grinding (0.14 kgf/mm²) showed the lowest shear strength means and differed statistically from control brackets (0.52 kgf/mm²) (p<0.05). In conclusion...

Effects of silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets

Atsü,Saadet; Çatalbaş,Bülent; Gelgör,Ibrahim Erhan
Fonte: Faculdade De Odontologia De Bauru - USP Publicador: Faculdade De Odontologia De Bauru - USP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2011 EN
Relevância na Pesquisa
37.3%
OBJECTIVE: The aim of this study was to evaluate the effects of tribochemical silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets. MATERIAL AND METHODS: Twenty debonded metal and 20 debonded ceramic brackets were randomly assigned to receive one of the following surface treatments (n=10 for each group): (1) sandblasting (control); (2) tribochemical silica coating combined with silane. Brackets were rebonded to the enamel surface on the labial and lingual sides of premolars with a light-polymerized resin composite. All specimens were stored in distilled water for 1 week and then thermocycled (5,000 cycles) between 5-55ºC. Shear bond strength values were measured using a universal testing machine. Student's t-test was used to compare the data (α=0.05). Failure mode was assessed using a stereomicroscope, and the treated and non-treated bracket surfaces were observed by scanning electron microscopy. RESULTS: Rebonded ceramic brackets treated with silica coating followed by silanization had significantly greater bond strength values (17.7±4.4 MPa) than the sandblasting group (2.4±0.8 MPa, P<0.001). No significant difference was observed between the rebonded metal brackets treated with silica coating with silanization (15±3.9 MPa) and the sandblasted brackets (13.6±3.9 MPa). Treated rebonded ceramic specimens primarily exhibited cohesive failure in resin and adhesive failure at the enamel-adhesive interface. CONCLUSIONS: In comparison to sandblasting...

Assessment of torque angle of brackets from different brands

Anjos,Anelisa dos; Pompeo,Daniela Daufenback; Anjos,Gilson José Enricone dos; Oliveira,Gustavo Mussi Stefan; Rosário,Henrique Damian
Fonte: Faculdade de Odontologia de Piracicaba - UNICAMP Publicador: Faculdade de Odontologia de Piracicaba - UNICAMP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2015 EN
Relevância na Pesquisa
37.33%
AIM: To measure torque angle values of brackets designed for canines, comparing it to their prescription values. METHODS: One hundred and sixty maxillary -2o and mandibular -11o canine brackets of Roth prescription from the following brands were selected: Abzil, Eurodonto, Morelli and Ormco. The brackets were set in wax and images were obtained by scanning. Reference points were determined over these images, lines drawn and the torque angle was measured. The Student's t-test and the Wilcoxon signed-rank test were used at a significance level of 5%. RESULTS: For maxillary canine brackets, the medium torque angle values were: Abzil -0.93o ± 0.88o; Eurodonto 0.13o ± 0.34o; Morelli -2.56o ± 0.50o, and Ormco -1.16o ± 1.27o. For mandibular canine brackets, the values were: Abzil -11.76o ± 0.40o; Eurodonto -10.40o ± 0.25o; Morelli -11.18o ± 0.56o, and Ormco -11.36o ± 0.30o. For maxillary canine brackets, the brands Abzil, Morelli, and Ormco presented statistically diferente values from those indicated for prescription. For mandibular canine brackets, the brands Abzil, Eurodonto, and Ormco presented statistically different values from the prescribed ones. CONCLUSIONS: Some marketed brands present differences between the torque angle found in the brackets and those recommended in the prescription. However...

Comparison of frictional resistance between self-ligating and conventional brackets tied with elastomeric and metal ligature in orthodontic archwires

Leite,Vanessa Vieira; Lopes,Murilo Baena; Gonini Júnior,Alcides; Almeida,Marcio Rodrigues de; Moura,Sandra Kiss; Almeida,Renato Rodrigues de
Fonte: Dental Press International Publicador: Dental Press International
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2014 EN
Relevância na Pesquisa
37.33%
OBJECTIVE: To compare the frictional resistance between self-ligating and conventional brackets tied to different types of wire. MATERIAL AND METHODS : Abzil Kirium Capelozza (Pattern I) and Easy Clip (Roth prescription) incisor brackets were used. An elastomeric ligature or a ligating wire 0.10-in was used to ligate the wire to the Abzil bracket. Three types of orthodontic archwire alloys were assessed: 0.016-in NiTi wire, 0.016 x 0.021-in NiTi wire and 0.019 x 0.025-in steel wire. Ten observations were carried out for each bracket-archwire angulation combination. Brackets were mounted in a special appliance, positioned at 90 degrees in relation to the wire and tested in two angulations. Frictional test was performed in a Universal Testing Machine at 5 mm/min and 10 mm of displacement. The means (MPa) were submitted to ANOVA and Tukey's test set at 5% of significance. The surfaces of wires and brackets were observed at SEM. RESULTS: Steel-tied brackets (16.48 ± 8.31) showed higher means of frictional resistance than elastomeric-tied brackets (4.29 ± 2.16 ) and self-ligating brackets (1.66 ± 1.57) (P < 0.05), which also differed from each other (P < 0.05). As for the type of wire, 0.019 x 0.025-in steel wire (5.67 ± 3.97) showed lower means (P < 0.05) than 0.16-in NiTi wire (8.26 ± 10.92) and 0.016 x 0.021-in NiTi wire (8.51 ± 7.95)...

Assessment of torque angle of brackets from different brands

Anjos, Anelisa dos; Pompeo, Daniela Daufenback; Anjos, Gilson José Enricone dos; Oliveira, Gustavo Mussi Stefan; Rosário, Henrique Damian
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ;
Publicado em 30/03/2015 POR
Relevância na Pesquisa
37.33%
Aim: To measure torque angle values of brackets designed for canines, comparing it to their prescription values. Methods: One hundred and sixty maxillary (-2o ) and mandibular (-11o ) canine brackets of Roth prescription from the following brands were selected: Abzil, Eurodonto, Morelli and Ormco. The brackets were set in wax and images were obtained by scanning. Reference points were determined over these images, lines drawn and the torque angle was measured. The Student’s t-test and the Wilcoxon signed-rank test were used at a significance level of 5%. Results: For maxillary canine brackets, the medium torque angle values were: Abzil - 0.93o (± 0.88o ); Eurodonto 0.13o (± 0.34o ); Morelli -2.56o (± 0.50o ), and Ormco -1.16o (± 1.27o ). For mandibular canine brackets, the values were: Abzil -11.76o (± 0.40o ); Eurodonto -10.40o (± 0.25o ); Morelli -11.18o (± 0.56o ), and Ormco -11.36o (± 0.30o ). For maxillary canine brackets, the brands Abzil, Morelli, and Ormco presented statistically diferente values from those indicated for prescription. For mandibular canine brackets, the brands Abzil, Eurodonto, and Ormco presented statistically different values from the prescribed ones. Conclusions: Some marketed brands present differences between the torque angle found in the brackets and those recommended in the prescription. However...

Staining of esthetic brackets by plaque disclosing solutions

Ismael, Luiza Novelino Acatauassú; Nunes, Mauro de Amorim Acatauassú; Nunes, Ana Maria Novelino Acatauassú; Motta, Rogério Heládio Lopes; Demasi, Ana Paula Dias; Flório, Flávia Martão
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ;
Publicado em 07/10/2015 POR
Relevância na Pesquisa
37.42%
Aim: To evaluate the staining of esthetic orthodontic brackets by plaque disclosing solutions. Methods: Two types of brackets manufactured by GAC/DENTSPLY® were evaluated: ceramic (n=30) and polycarbonate (n=30). The brackets were divided into 6 groups. Two control groups (n=6) were immersed in absolute ethanol: GI - ceramic brackets and GII - polycarbonate brackets. Four experimental groups (n=12) were immersed in different plaque disclosing solutions: GIII (ceramic brackets) and GIV (polycarbonate brackets) were immersed in Replak®; GV (ceramic brackets) and GVI (polycarbonate brackets) were immersed in Replasul “S”®. Relative quantitative analysis of the influence of plaque disclosing tablets on bracket staining was performed using reflectance spectrophotometry of stain deposition. Exploratory analysis of the data was performed using Analysis of Variance (ANOVA) in a 2x2 factorial setup (bracket x immersion) with additional treatments (controls). Results: The results demonstrated that the ceramic brackets presented the highest amount of staining when Replasul “S”® was used (pd”0.05). However, when Replak® was used, no statistically significant difference was found in comparison with the control group (p>0.05). For polycarbonate brackets...

Do self-ligating brackets favor greater bacterial aggregation?

Pithon, Matheus M.; Santos, Rogério L. dos; Nascimento, Leonard Euller; Ayres, Amanda Osorio; Alvian, Daniela; Bolognese, Ana Maria
Fonte: UNICAMP/FOP Publicador: UNICAMP/FOP
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; Formato: application/pdf
Publicado em 09/11/2015 POR
Relevância na Pesquisa
37.39%
Aim: To verify the hypothesis that self-ligating brackets favor greater aggregation of microorganisms when compared with conventional brackets. Methods: Four types of self-ligating metal brackets were evaluated. Initially, 50 brackets were divided into five groups (n=10): Morelli Conventional, GAC (In-Ovation R, Dentsply Caulk), Aditek (Easy Clip), Ormco (Damon System) and 3M Unitek (Smart Clip). An in vivo evaluation was carried out in which the brackets were bonded to the mandibular teeth of five healthy individuals who had not undergone previous orthodontic treatment. The right hemiarch brackets were used for bacterial plaque collection and those on the left side were examined by scanning electron microscopy (SEM). Before bracket bonding, the bacterial plaque material aggregated to the tooth surfaces was collected, with the areas of choice being the cervical-buccal and mesial and distal interproximal regions. After 21 days had elapsed since bonding, the plaque adhered to the winglet, channel and cervical regions of the bracket bases was collected. The materials collected were diluted and seeded on Petri dishes onto Mitis salivarius medium specific for S. mutans and non-specified BHI culture medium. Colony forming unit (CFU) counts were performed visually after 24...