Karina Mundstock - Academia.edu (original) (raw)
Papers by Karina Mundstock
Objective: The purpose of this study was to evaluate the force delivered by different superlastic... more Objective: The purpose of this study was to evaluate the force delivered by different superlastic nickel-titanium wires during vertical displacement, in order to determine whether their stress release meets the criteria for constant and light forces that are usually accredited to these archwires. Method: Ten samples of 6 brands of 0.016-in archwires (Ormco, GAC, Morelli, TP, American Orthodontics e Rocky Mountain) were tested in a complete metal model using Dynalock brackets (3M Unitek™). In the canine position, there was a sliding bracket connected to a pole. This set was related to a load cell of 0.5 kg attached to a universal testing machine (Autograph AG-199kNG, Shimadzu). The crosshead speed was 0.5 mm/min and the maximum displacement was 1.0 mm. The model was submerged in temperature-controlled water. The results were analyzed by ANOVA (p < 0.05), using the software SAS System 8.02, Cry, NC, USA. Results: The TP archwire had the lowest force throughout the test, although the final force was high (277.91 g). The Rocky Mountain archwire had the highest force release (455.41 g). Conclusion: The different brands of wires tested in this study failed in delivering low and constant forces as expected from superlastic nickel-titanium wires. The forces were extremely heavy for a vertical tooth movement.Objetivo: o objetivo deste estudo foi avaliar a força liberada por diferentes fios de níquel-titânio (NiTi) superelástico em deslocamento vertical, a fim de determinar se a liberação de estresse por esses satisfaz o critério de forças suaves e constantes, geralmente atribuído a tais arcos. Métodos: dez amostras de seis arcos de NiTi superelástico 0,016” de marcas comerciais diferentes (Ormco, GAC, Morelli, TP, American Orthodontics e Rocky Mountain) foram testados em um modelo metálico usando braquetes Dynalock (3M Unitek). Na região do canino, havia um braquete móvel conectado a uma haste, a qual estava relacionada com uma célula de carga de 0,5kg de uma máquina universal de ensaios (Autograph AG-199kNG, Shimadzu). O deslocamento do conjunto na região do canino foi realizado a uma velocidade constante de 0,5mm/min e o deslocamento máximo foi de 1,0mm. O conjunto foi submerso em água com temperatura controlada a 37ºC. Resultados: os resultados obtidos foram avaliados por ANOVA (p <0,05), usando o software SAS System 8.02, Cry, NC, EUA. O arco da TP apresentou a menor força durante todo o teste, embora a força final tenha sido elevada (277,91g). O fio da Rocky Mountain demonstrou a maior liberação de força (455,41g). Conclusões: conclui-se que todas as diferentes marcas comerciais testadas nesse estudo falharam em liberar forças baixas e constantes, como é esperado nos fios de níquel-titânio superelástico. As forças foram extremamente pesadas para o movimento vertical de dentes
Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and const... more Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives: To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods: A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion: Among t...
página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relac... more página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relacionados. Id: 510683. Autor: Mundstock, Karina Santos. ... Responsável: BR39.2 - Biblioteca Professora Maria Dilma de Oliveira Gonçalves. BR39.2, M965e. página 1 de 1, ...
É um recurso digital de vídeo desenvolvido com o objetivo de demonstrar o método de confecção dos... more É um recurso digital de vídeo desenvolvido com o objetivo de demonstrar o método de confecção dos grampos ortodônticos de retenção dos aparelhos removíveis e todas as etapas da confecção da dobragem dos fios. São 6 vídeos que incluem os principais exercícios práticos ministrados na área de Ortodontia pré-clínica: Adams, Kennedy, Grade Palatina, Molas, Arco Vestibular de Hawley e Jackson.Não é possível instalar um arquivo de vídeo. Apenas transfira-o para seu computador e abra como um arquivo comum. Arquivos de vídeo não podem ser editados, mas podem ser visualizados em players como o VLC Media Player (que é gratuito), o Windows Media Player ou o QuickTime. Os formatos mais comuns de vídeo serão executados normalmente por estes players (avi, mpeg e mp4).VídeoOs vídeos desse objeto virtual de aprendizagem se destinam a auxiliar os alunos na confecção de grampos ortodônticos após a demonstração prática realizada pelos professores em sala de aula, podendo também fazer uso desse recurso de vídeo fora da sala de aula na realização de exercícios práticos de reforço. Também poderão ser utilizados durante a prática clínica de outras disciplinas que lançam mão dessas alternativas de aparelho para seus tratamentos
Archives of Oral Biology, 2011
Objective: The molecular variation of paired domain box gene 9 (PAX9) was previously investigated... more Objective: The molecular variation of paired domain box gene 9 (PAX9) was previously investigated by our research group and a high degree of evolutionary conservation in coding and non-coding regions was observed except in exon 3. PAX9 is a transcription factor important in tooth development, and we wanted to verify its role in dental agenesis in detail. Since dental development is a complex trait we also decided to examine the influence of another transcription factor, muscle segment homeodomain-homeobox 1 (MSX1) on it. Design: A total of 360 consecutively ascertained patients seeking orthodontic treatment were screened for tooth agenesis and 33% of them were found to have it. Thirty-five of those with agenesis and 15 controls had their DNA studied for PAX9 exons 2, 3, 4 and adjacent regions (total of 1476 base pairs, bp) as well as MSX1 exon 2 (698 bp). A trio (a proband and her parents) was also studied. Results: Six polymorphic sites were found, three in PAX9 exon 3 and three in MSX1 exon2. MSX1 rs1095 derived allele occurred in individuals with agenesis only, and two other mutations in this gene had been earlier associated with tooth agenesis. Homozygosity for the PAX9 Ala240Pro mutation was studied in a family (proband and her parents), suggesting recessive inheritance with variable expressivity for the dental agenesis found. Conclusion: Common variants located out of the DNA binding domain of the two PAX9 and MSX1 genes can also be related to tooth agenesis.
World journal of orthodontics, 2007
To evaluate, via occlusal radiographs, transversal alterations that result from rapid maxillary e... more To evaluate, via occlusal radiographs, transversal alterations that result from rapid maxillary expansion with the Hyrax appliance. The sample consisted of 14 children of both genders, in mixed dentition, with unilateral or bilateral posterior crossbite. Occlusal radiographs were taken at the beginning and at the end of maxillary expansion. The following variables were measured: intermolar distance, interincisal distance, incisor interapex distance, interbase distance, interarm distance, and interincisor inclination. The interapex and interbase distances had their radiographic amplification corrected. A mean opening of 7.65 mm of the expansion screw resulted in an increase of the intermolar distance of 7.40 mm, progressively smaller increases of the interarm distance of the appliance of 6.6 mm, and of the incisor interapex distance of 5.5 mm. The distance between the maxillary incisors increased 1.9 mm, which indicated more posterior than anterior expansion. In addition, some buccal...
Minerva Dental and Oral Science
BACKGROUND The aim of this study was to test the hypothesis that treatment with orthodontic appli... more BACKGROUND The aim of this study was to test the hypothesis that treatment with orthodontic appliances evokes significant functional limitations and emotional stress, which can be detected by salivary biomarkers. METHODS Twenty subjects (10 men and 10 women) who underwent orthodontic treatment were included in this prospective study. Saliva was sampled for detection of alpha-amylase activity and cortisol levels at three different times: before bracket placement (T0), 24 hours after archwire placement (T1), and 30 days after archwire placement (T2). The saliva electrolytes concentrations of calcium, phosphorus, magnesium, sodium and potassium were also evaluated. Moreover, the possible functional limitations of the appliances were evaluated by a masticatory performance test and pain experience registration. All variables were compared with those in a control group with normal occlusion. RESULTS The orthodontic patients exhibited a significant increase in emotional stress as detected by the alpha-amylase activity at T1, the period in which patients reported the higher values of pain and exhibited the lower masticatory performance indices. The basal salivary cortisol was not affect by the treatment and the main change detected in electrolyte concentration was a sodium reduction, when these patients were compared to controls. CONCLUSIONS The present data indicate that orthodontic patients are under emotional stress only during the period of higher pain experience, which could also disrupt the masticatory performance. However, these alterations were not correlated with a single measurement of stress-related biomarkers in saliva, suggesting that these solitary endocrine measurements are not adequate to predict the temporary pain and masticatory limitation experimented by patients undergoing orthodontic treatment.
O objetivo deste artigo e apresentarmos um sistema de avaliacao do uso de aparelhos extrabucais. ... more O objetivo deste artigo e apresentarmos um sistema de avaliacao do uso de aparelhos extrabucais. Este sistema, chamado Compliance Science System (CSS) constitui-se de um modulo eletronico instalado na tala do aparelho extrabucal, de um leitor deste modulo que e conectado ao computador e de um programa especifico para leitura dos registros feitos pelo modulo. O sistema CSS tem a finalidade de quantificar o tempo de uso do aparelho extrabucal, determinando o nivel de cooperacao do paciente durante os periodos do dia em que foi utilizado. Com a finalidade de ilustrar a utilizacao do sistema CSS, apresentamos dois (2) casos clinicos de pacientes portadores de maloclusao de Classe II de Angle esqueletica com overjet acentuado e que foram tratados com a utilizacao de aparelho extrabucal de puxada cervical do tipo KLoehn (AU)
Revista Brasileira de Odontologia Legal
Age estimation for forensic purposes in axial images of the two first cervical vertebraea pilot s... more Age estimation for forensic purposes in axial images of the two first cervical vertebraea pilot study.
Revista da Faculdade de Odontologia de Porto Alegre
Objetivo: Avaliar se o tratamento ortodôntico está associado à presença de desordens temporomandi... more Objetivo: Avaliar se o tratamento ortodôntico está associado à presença de desordens temporomandibulares (DTM) em adolescentes e adultos jovens de idade entre 12 e 24 anos. Materiais e métodos: Foi realizada uma investigação sobre sinais e sintomas de DTM aplicando-se o protocolo RDC/TMD (Critérios de Diagnóstico para Pesquisa das Desordens Temporomandibulares), em pacientes ortodônticos e controles. A amostra foi composta por 70 participantes divididos em dois grupos. O grupo ortodôntico foi composto por 35 voluntários em fase ativa de tratamento ortodôntico fixo e o controle por 35 voluntários sem histórico de tratamento ortodôntico. Resultados: Não ocorreram diferenças estatísticas entre os grupos relacionadas ao auto-relato de sintomas de dor de cabeça, dores na face, ruídos articulares e hábitos parafuncionais anteriores ao exame (p>0,1). Em relação à abertura máxima de boca em milímetros e dor relacionada ao movimento mandibular de abertura também não houve diferença estatí...
Revista da Faculdade de Odontologia de Porto Alegre
Um dente impactado é definido como aquele que apresenta, radiograficamente, dois terços de sua ra... more Um dente impactado é definido como aquele que apresenta, radiograficamente, dois terços de sua raiz desenvolvida e não entra em processo eruptivo. Quando esta condição se estabelece na região anterior, compromete a aparência estética da criança, preocupando os pais e incentivando a procura por um tratamento ortodôntico. O tratamento pode ser feito através de diferentes aparatologias, fixas ou removíveis. Objetivo: relatar dois casos clínicos de tracionamento de incisivo central superior impactado com aparelho removível, os quais foram tratados na Disciplina de Ortodontia Clínica da FO UFRGS. Relato de caso: Em ambos os casos os pacientes eram do sexo masculino, encontravam-se em fase de dentição mista e buscaram atendimento tendo como queixa a ausência do incisivo central superior. O tratamento foi realizado através de tracionamento dos incisivos impactados em ambos os pacientes. O tracionamento foi realizado utilizando-se um aparelho removível superior com arco de Hawley modificado...
Revista da Faculdade de Odontologia - UPF, 2016
Objetivo: verificar a frequência e a ocasião da ingestão de sacarose na dieta de pacientes atendi... more Objetivo: verificar a frequência e a ocasião da ingestão de sacarose na dieta de pacientes atendidos na disciplina de Ortodontia Clínica da Faculdade de Odontologia da Universidade Federal do Rio Grande do Sul. Sujeitos e método: o presente estudo analisou, por intermédio do índice de potencial cariogênico e da solicitação de diário alimentar de três dias, a ingestão de sacarose na dieta de pacientes. Além disso, o índice do potencial cariogênico foi associado ao sexo e à idade dos pacientes. Resultados: do total de 82 questionários enviados, houve retorno de 44 (53,7%). A média total do potencial cariogênico foi de 69 pontos (± 24,5), o que corresponde a um escore moderado. Entretanto, 18 pacientes (40,9%) tiveram escore alto do potencial cariogênico, 22 pacientes (50%) escore médio e, somente, 4 pacientes (9,1%) apresentaram escore baixo. O índice do potencial cariogênico não apresentou associação significativa nem com o sexo (p=0,727) nem com a faixa etária (p=0,742) dos paciente...
Rev Odonto Cienc, Dec 1, 1994
Ortodon Gauch, Dec 1, 2002
Materials and Design, Dec 1, 2009
This study investigates the mechanical properties of alumina-feldspar based ceramics when exposed... more This study investigates the mechanical properties of alumina-feldspar based ceramics when exposed to an aggressive environment (acetic acid 4%). Alumina ceramics containing different concentrations of feldspar (0%, 1%, 5%, 10%, or 40%) were sintered at either 1300, 1600, or 1700°C. Flaws (of width 0%, 30%, or 50%) were introduced into the specimens using a saw. Half of these ceramic bodies were exposed to acetic acid. Their flexural strength, K IC , and porosity were measured and the fractured samples were evaluated using scanning electronic-and optical microscopy. It was found that in the ceramic bodies sintered at 1600°C, feldspar content up to 10% improved flexural strength and K IC, and reduced porosities. Generally, it was found that acetic acid had a weakening effect on the flexural strength of samples sintered at 1700°C but a beneficial effect on K IC of ceramics sintered at 1600°C. It was concluded that alumina-based ceramics with feldspar content up to 10% and sintered at higher temperatures would perform better in an aggressive environment similar to oral cavity.
Stomatos, Nov 6, 2013
Objective: To assess soft tissue changes in the lip area after orthodontic treatment with fi rst ... more Objective: To assess soft tissue changes in the lip area after orthodontic treatment with fi rst bicuspid extraction in 20 Angle class II patients. Methods: A total of 40 profi le cephalograms were digitized and measured: 20 obtained at baseline and 20 after treatment. Eighteen landmarks were marked on the cephalograms and analyzed using the Radiocef software version 4.0 (Radio Memory Ltda.). Linear and angular measurements were used to analyze changes in upper and lower lip position. Statistical analysis included calculation of error. Pre-and post-treatment measurements were compared using the Student t test for paired samples. Results: Upper and lower lips showed a mean retrusion of 2 mm. There was a signifi cant increase in the nasolabial angle, of 5.36°, leading to a decreased facial convexity. The upper lip angle (ULA) retruded-4.74°. Conclusions: Our fi ndings suggest that treatment of class II patients including fi rst bicuspid extraction result in small changes in the patients' facial profi le (increased nasolabial angle and decreased upper lip angle).
American Journal of Orthodontics and Dentofacial Orthopedics, 2015
Orthodontic patients usually complain about masticatory limitations associated with the activatio... more Orthodontic patients usually complain about masticatory limitations associated with the activation of fixed appliances. The aim of this investigation was to evaluate whether orthodontic pain reflects differences in the objective evaluation of mastication and in the levels of proinflammatory cytokines in the crevicular fluid of patients undergoing orthodontic treatment. Twenty patients with malocclusions requiring orthodontic treatment were included in this prospective study. Their pain experience, masticatory performance, and levels of interleukin 1-beta and prostaglandin E2 in crevicular fluid were evaluated at 3 times: before bracket placement, 24 hours after archwire placement, and 30 days after the initial appointment. All variables were compared with those of a control group of 25 subjects with normal occlusion. The masticatory performance of the patients was significantly reduced at 24 hours after bracket placement, the period in which they reported higher values of pain and had higher levels of interleukin 1-beta. The levels of prostaglandin E2 did not change in the periods evaluated, and there were no correlations between the levels of cytokines and the functional limitations observed. The only significant correlation was between pain and decreased masticatory performance. The masticatory performance of orthodontic patients is significantly reduced only during the period of greatest pain. However, these alterations did not correlate with any measurement of interleukin 1-beta or prostaglandin E2 in the crevicular fluid, suggesting that these solitary measurements are inadequate to predict the temporary pain and masticatory limitations experienced by patients undergoing orthodontic treatment.
Objective: The purpose of this study was to evaluate the force delivered by different superlastic... more Objective: The purpose of this study was to evaluate the force delivered by different superlastic nickel-titanium wires during vertical displacement, in order to determine whether their stress release meets the criteria for constant and light forces that are usually accredited to these archwires. Method: Ten samples of 6 brands of 0.016-in archwires (Ormco, GAC, Morelli, TP, American Orthodontics e Rocky Mountain) were tested in a complete metal model using Dynalock brackets (3M Unitek™). In the canine position, there was a sliding bracket connected to a pole. This set was related to a load cell of 0.5 kg attached to a universal testing machine (Autograph AG-199kNG, Shimadzu). The crosshead speed was 0.5 mm/min and the maximum displacement was 1.0 mm. The model was submerged in temperature-controlled water. The results were analyzed by ANOVA (p < 0.05), using the software SAS System 8.02, Cry, NC, USA. Results: The TP archwire had the lowest force throughout the test, although the final force was high (277.91 g). The Rocky Mountain archwire had the highest force release (455.41 g). Conclusion: The different brands of wires tested in this study failed in delivering low and constant forces as expected from superlastic nickel-titanium wires. The forces were extremely heavy for a vertical tooth movement.Objetivo: o objetivo deste estudo foi avaliar a força liberada por diferentes fios de níquel-titânio (NiTi) superelástico em deslocamento vertical, a fim de determinar se a liberação de estresse por esses satisfaz o critério de forças suaves e constantes, geralmente atribuído a tais arcos. Métodos: dez amostras de seis arcos de NiTi superelástico 0,016” de marcas comerciais diferentes (Ormco, GAC, Morelli, TP, American Orthodontics e Rocky Mountain) foram testados em um modelo metálico usando braquetes Dynalock (3M Unitek). Na região do canino, havia um braquete móvel conectado a uma haste, a qual estava relacionada com uma célula de carga de 0,5kg de uma máquina universal de ensaios (Autograph AG-199kNG, Shimadzu). O deslocamento do conjunto na região do canino foi realizado a uma velocidade constante de 0,5mm/min e o deslocamento máximo foi de 1,0mm. O conjunto foi submerso em água com temperatura controlada a 37ºC. Resultados: os resultados obtidos foram avaliados por ANOVA (p <0,05), usando o software SAS System 8.02, Cry, NC, EUA. O arco da TP apresentou a menor força durante todo o teste, embora a força final tenha sido elevada (277,91g). O fio da Rocky Mountain demonstrou a maior liberação de força (455,41g). Conclusões: conclui-se que todas as diferentes marcas comerciais testadas nesse estudo falharam em liberar forças baixas e constantes, como é esperado nos fios de níquel-titânio superelástico. As forças foram extremamente pesadas para o movimento vertical de dentes
Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and const... more Introduction: There is a great variety of orthodontic brackets in the Brazilian market, and constantly evaluating them is critical for professionals to know their properties, so as to be able to choose which product best suits their clinical practice. Objectives: To evaluate the bond strength and the adhesive remnant index (ARI) of different brands of metal brackets. Material and Methods: A total of 105 bovine incisors were used, and brackets of different brands were bonded to teeth. Seven different bracket brands were tested (MorelliTM, American OrthodonticsTM, TP OrthodonticsTM, Abzil-3MTM, OrthometricTM, TecnidentTM and UNIDENTM). Twenty-four hours after bonding, shear bond strength test was performed; and after debonding, the ARI was determined by using an optical microscope at a 10-fold increase. Results: Mean shear bond strength values ranged from 3.845 ± 3.997 (MorelliTM) to 9.871 ± 5.106 MPa (TecnidentTM). The majority of the ARI index scores was 0 and 1. Conclusion: Among t...
página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relac... more página 1 de 1, 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. experimental, Documentos relacionados. Id: 510683. Autor: Mundstock, Karina Santos. ... Responsável: BR39.2 - Biblioteca Professora Maria Dilma de Oliveira Gonçalves. BR39.2, M965e. página 1 de 1, ...
É um recurso digital de vídeo desenvolvido com o objetivo de demonstrar o método de confecção dos... more É um recurso digital de vídeo desenvolvido com o objetivo de demonstrar o método de confecção dos grampos ortodônticos de retenção dos aparelhos removíveis e todas as etapas da confecção da dobragem dos fios. São 6 vídeos que incluem os principais exercícios práticos ministrados na área de Ortodontia pré-clínica: Adams, Kennedy, Grade Palatina, Molas, Arco Vestibular de Hawley e Jackson.Não é possível instalar um arquivo de vídeo. Apenas transfira-o para seu computador e abra como um arquivo comum. Arquivos de vídeo não podem ser editados, mas podem ser visualizados em players como o VLC Media Player (que é gratuito), o Windows Media Player ou o QuickTime. Os formatos mais comuns de vídeo serão executados normalmente por estes players (avi, mpeg e mp4).VídeoOs vídeos desse objeto virtual de aprendizagem se destinam a auxiliar os alunos na confecção de grampos ortodônticos após a demonstração prática realizada pelos professores em sala de aula, podendo também fazer uso desse recurso de vídeo fora da sala de aula na realização de exercícios práticos de reforço. Também poderão ser utilizados durante a prática clínica de outras disciplinas que lançam mão dessas alternativas de aparelho para seus tratamentos
Archives of Oral Biology, 2011
Objective: The molecular variation of paired domain box gene 9 (PAX9) was previously investigated... more Objective: The molecular variation of paired domain box gene 9 (PAX9) was previously investigated by our research group and a high degree of evolutionary conservation in coding and non-coding regions was observed except in exon 3. PAX9 is a transcription factor important in tooth development, and we wanted to verify its role in dental agenesis in detail. Since dental development is a complex trait we also decided to examine the influence of another transcription factor, muscle segment homeodomain-homeobox 1 (MSX1) on it. Design: A total of 360 consecutively ascertained patients seeking orthodontic treatment were screened for tooth agenesis and 33% of them were found to have it. Thirty-five of those with agenesis and 15 controls had their DNA studied for PAX9 exons 2, 3, 4 and adjacent regions (total of 1476 base pairs, bp) as well as MSX1 exon 2 (698 bp). A trio (a proband and her parents) was also studied. Results: Six polymorphic sites were found, three in PAX9 exon 3 and three in MSX1 exon2. MSX1 rs1095 derived allele occurred in individuals with agenesis only, and two other mutations in this gene had been earlier associated with tooth agenesis. Homozygosity for the PAX9 Ala240Pro mutation was studied in a family (proband and her parents), suggesting recessive inheritance with variable expressivity for the dental agenesis found. Conclusion: Common variants located out of the DNA binding domain of the two PAX9 and MSX1 genes can also be related to tooth agenesis.
World journal of orthodontics, 2007
To evaluate, via occlusal radiographs, transversal alterations that result from rapid maxillary e... more To evaluate, via occlusal radiographs, transversal alterations that result from rapid maxillary expansion with the Hyrax appliance. The sample consisted of 14 children of both genders, in mixed dentition, with unilateral or bilateral posterior crossbite. Occlusal radiographs were taken at the beginning and at the end of maxillary expansion. The following variables were measured: intermolar distance, interincisal distance, incisor interapex distance, interbase distance, interarm distance, and interincisor inclination. The interapex and interbase distances had their radiographic amplification corrected. A mean opening of 7.65 mm of the expansion screw resulted in an increase of the intermolar distance of 7.40 mm, progressively smaller increases of the interarm distance of the appliance of 6.6 mm, and of the incisor interapex distance of 5.5 mm. The distance between the maxillary incisors increased 1.9 mm, which indicated more posterior than anterior expansion. In addition, some buccal...
Minerva Dental and Oral Science
BACKGROUND The aim of this study was to test the hypothesis that treatment with orthodontic appli... more BACKGROUND The aim of this study was to test the hypothesis that treatment with orthodontic appliances evokes significant functional limitations and emotional stress, which can be detected by salivary biomarkers. METHODS Twenty subjects (10 men and 10 women) who underwent orthodontic treatment were included in this prospective study. Saliva was sampled for detection of alpha-amylase activity and cortisol levels at three different times: before bracket placement (T0), 24 hours after archwire placement (T1), and 30 days after archwire placement (T2). The saliva electrolytes concentrations of calcium, phosphorus, magnesium, sodium and potassium were also evaluated. Moreover, the possible functional limitations of the appliances were evaluated by a masticatory performance test and pain experience registration. All variables were compared with those in a control group with normal occlusion. RESULTS The orthodontic patients exhibited a significant increase in emotional stress as detected by the alpha-amylase activity at T1, the period in which patients reported the higher values of pain and exhibited the lower masticatory performance indices. The basal salivary cortisol was not affect by the treatment and the main change detected in electrolyte concentration was a sodium reduction, when these patients were compared to controls. CONCLUSIONS The present data indicate that orthodontic patients are under emotional stress only during the period of higher pain experience, which could also disrupt the masticatory performance. However, these alterations were not correlated with a single measurement of stress-related biomarkers in saliva, suggesting that these solitary endocrine measurements are not adequate to predict the temporary pain and masticatory limitation experimented by patients undergoing orthodontic treatment.
O objetivo deste artigo e apresentarmos um sistema de avaliacao do uso de aparelhos extrabucais. ... more O objetivo deste artigo e apresentarmos um sistema de avaliacao do uso de aparelhos extrabucais. Este sistema, chamado Compliance Science System (CSS) constitui-se de um modulo eletronico instalado na tala do aparelho extrabucal, de um leitor deste modulo que e conectado ao computador e de um programa especifico para leitura dos registros feitos pelo modulo. O sistema CSS tem a finalidade de quantificar o tempo de uso do aparelho extrabucal, determinando o nivel de cooperacao do paciente durante os periodos do dia em que foi utilizado. Com a finalidade de ilustrar a utilizacao do sistema CSS, apresentamos dois (2) casos clinicos de pacientes portadores de maloclusao de Classe II de Angle esqueletica com overjet acentuado e que foram tratados com a utilizacao de aparelho extrabucal de puxada cervical do tipo KLoehn (AU)
Revista Brasileira de Odontologia Legal
Age estimation for forensic purposes in axial images of the two first cervical vertebraea pilot s... more Age estimation for forensic purposes in axial images of the two first cervical vertebraea pilot study.
Revista da Faculdade de Odontologia de Porto Alegre
Objetivo: Avaliar se o tratamento ortodôntico está associado à presença de desordens temporomandi... more Objetivo: Avaliar se o tratamento ortodôntico está associado à presença de desordens temporomandibulares (DTM) em adolescentes e adultos jovens de idade entre 12 e 24 anos. Materiais e métodos: Foi realizada uma investigação sobre sinais e sintomas de DTM aplicando-se o protocolo RDC/TMD (Critérios de Diagnóstico para Pesquisa das Desordens Temporomandibulares), em pacientes ortodônticos e controles. A amostra foi composta por 70 participantes divididos em dois grupos. O grupo ortodôntico foi composto por 35 voluntários em fase ativa de tratamento ortodôntico fixo e o controle por 35 voluntários sem histórico de tratamento ortodôntico. Resultados: Não ocorreram diferenças estatísticas entre os grupos relacionadas ao auto-relato de sintomas de dor de cabeça, dores na face, ruídos articulares e hábitos parafuncionais anteriores ao exame (p>0,1). Em relação à abertura máxima de boca em milímetros e dor relacionada ao movimento mandibular de abertura também não houve diferença estatí...
Revista da Faculdade de Odontologia de Porto Alegre
Um dente impactado é definido como aquele que apresenta, radiograficamente, dois terços de sua ra... more Um dente impactado é definido como aquele que apresenta, radiograficamente, dois terços de sua raiz desenvolvida e não entra em processo eruptivo. Quando esta condição se estabelece na região anterior, compromete a aparência estética da criança, preocupando os pais e incentivando a procura por um tratamento ortodôntico. O tratamento pode ser feito através de diferentes aparatologias, fixas ou removíveis. Objetivo: relatar dois casos clínicos de tracionamento de incisivo central superior impactado com aparelho removível, os quais foram tratados na Disciplina de Ortodontia Clínica da FO UFRGS. Relato de caso: Em ambos os casos os pacientes eram do sexo masculino, encontravam-se em fase de dentição mista e buscaram atendimento tendo como queixa a ausência do incisivo central superior. O tratamento foi realizado através de tracionamento dos incisivos impactados em ambos os pacientes. O tracionamento foi realizado utilizando-se um aparelho removível superior com arco de Hawley modificado...
Revista da Faculdade de Odontologia - UPF, 2016
Objetivo: verificar a frequência e a ocasião da ingestão de sacarose na dieta de pacientes atendi... more Objetivo: verificar a frequência e a ocasião da ingestão de sacarose na dieta de pacientes atendidos na disciplina de Ortodontia Clínica da Faculdade de Odontologia da Universidade Federal do Rio Grande do Sul. Sujeitos e método: o presente estudo analisou, por intermédio do índice de potencial cariogênico e da solicitação de diário alimentar de três dias, a ingestão de sacarose na dieta de pacientes. Além disso, o índice do potencial cariogênico foi associado ao sexo e à idade dos pacientes. Resultados: do total de 82 questionários enviados, houve retorno de 44 (53,7%). A média total do potencial cariogênico foi de 69 pontos (± 24,5), o que corresponde a um escore moderado. Entretanto, 18 pacientes (40,9%) tiveram escore alto do potencial cariogênico, 22 pacientes (50%) escore médio e, somente, 4 pacientes (9,1%) apresentaram escore baixo. O índice do potencial cariogênico não apresentou associação significativa nem com o sexo (p=0,727) nem com a faixa etária (p=0,742) dos paciente...
Rev Odonto Cienc, Dec 1, 1994
Ortodon Gauch, Dec 1, 2002
Materials and Design, Dec 1, 2009
This study investigates the mechanical properties of alumina-feldspar based ceramics when exposed... more This study investigates the mechanical properties of alumina-feldspar based ceramics when exposed to an aggressive environment (acetic acid 4%). Alumina ceramics containing different concentrations of feldspar (0%, 1%, 5%, 10%, or 40%) were sintered at either 1300, 1600, or 1700°C. Flaws (of width 0%, 30%, or 50%) were introduced into the specimens using a saw. Half of these ceramic bodies were exposed to acetic acid. Their flexural strength, K IC , and porosity were measured and the fractured samples were evaluated using scanning electronic-and optical microscopy. It was found that in the ceramic bodies sintered at 1600°C, feldspar content up to 10% improved flexural strength and K IC, and reduced porosities. Generally, it was found that acetic acid had a weakening effect on the flexural strength of samples sintered at 1700°C but a beneficial effect on K IC of ceramics sintered at 1600°C. It was concluded that alumina-based ceramics with feldspar content up to 10% and sintered at higher temperatures would perform better in an aggressive environment similar to oral cavity.
Stomatos, Nov 6, 2013
Objective: To assess soft tissue changes in the lip area after orthodontic treatment with fi rst ... more Objective: To assess soft tissue changes in the lip area after orthodontic treatment with fi rst bicuspid extraction in 20 Angle class II patients. Methods: A total of 40 profi le cephalograms were digitized and measured: 20 obtained at baseline and 20 after treatment. Eighteen landmarks were marked on the cephalograms and analyzed using the Radiocef software version 4.0 (Radio Memory Ltda.). Linear and angular measurements were used to analyze changes in upper and lower lip position. Statistical analysis included calculation of error. Pre-and post-treatment measurements were compared using the Student t test for paired samples. Results: Upper and lower lips showed a mean retrusion of 2 mm. There was a signifi cant increase in the nasolabial angle, of 5.36°, leading to a decreased facial convexity. The upper lip angle (ULA) retruded-4.74°. Conclusions: Our fi ndings suggest that treatment of class II patients including fi rst bicuspid extraction result in small changes in the patients' facial profi le (increased nasolabial angle and decreased upper lip angle).
American Journal of Orthodontics and Dentofacial Orthopedics, 2015
Orthodontic patients usually complain about masticatory limitations associated with the activatio... more Orthodontic patients usually complain about masticatory limitations associated with the activation of fixed appliances. The aim of this investigation was to evaluate whether orthodontic pain reflects differences in the objective evaluation of mastication and in the levels of proinflammatory cytokines in the crevicular fluid of patients undergoing orthodontic treatment. Twenty patients with malocclusions requiring orthodontic treatment were included in this prospective study. Their pain experience, masticatory performance, and levels of interleukin 1-beta and prostaglandin E2 in crevicular fluid were evaluated at 3 times: before bracket placement, 24 hours after archwire placement, and 30 days after the initial appointment. All variables were compared with those of a control group of 25 subjects with normal occlusion. The masticatory performance of the patients was significantly reduced at 24 hours after bracket placement, the period in which they reported higher values of pain and had higher levels of interleukin 1-beta. The levels of prostaglandin E2 did not change in the periods evaluated, and there were no correlations between the levels of cytokines and the functional limitations observed. The only significant correlation was between pain and decreased masticatory performance. The masticatory performance of orthodontic patients is significantly reduced only during the period of greatest pain. However, these alterations did not correlate with any measurement of interleukin 1-beta or prostaglandin E2 in the crevicular fluid, suggesting that these solitary measurements are inadequate to predict the temporary pain and masticatory limitations experienced by patients undergoing orthodontic treatment.