9 research outputs found
Desenvolvimento dentário de crianças e adolescentes com fissura labiopalatina
Resumo: A avaliação do desenvolvimento dentário Ă© um recurso importante para o diagnĂłstico e o planejamento ortodĂ´ntico de indivĂduos com fissura labiopalatina. Estudos apontam que o desenvolvimento dentário desses indivĂduos Ă© atrasado. O objetivo deste estudo foi avaliar o desenvolvimento dentário de crianças e adolescentes brasileiros com fissura labiopalatina. A amostra foi constituĂda de 107 pares de radiografias panorâmicas de crianças e adolescentes com e sem fissura labiopalatina, de mesmo gĂŞnero e com uma diferença de idade de atĂ© 60 dias, na faixa etária dos 6 aos 15 anos. As radiografias foram digitalizadas e mascaradas e a idade dentária foi avaliada pelo mĂ©todo de Demirjian et al. (1973). As avaliações foram realizadas por trĂŞs examinadores treinados. Cada examinador avaliou as radiografias trĂŞs vezes, com um intervalo de trĂŞs dias entre as avaliações. Foi calculada a mĂ©dia dos resultados de todas as avaliações para estimar a idade dentária de cada indivĂduo. Os dados foram analisados estatisticamente por meio de testes nĂŁo-paramĂ©tricos (P <0,05). A idade dentária apresentou avanço em relação Ă idade cronolĂłgica nos dois grupos (P <0,0001). Houve atraso na idade dentária no grupo caso quando comparado ao grupo controle de 0,17 anos (2,1 meses) sem significância estatĂstica (P = 0,152). O desenvolvimento dentário das crianças e adolescentes com fissura labiopalatina apresentou atraso quando comparado ao grupo controle, porĂ©m sem significância estatĂstica. A avaliação do desenvolvimento dentário de indivĂduos com fissura labiopalatina deve ter a mesma abordagem utilizada para os indivĂduos sem fissura, com enfoque na individualização do diagnĂłstico e do planejamento do tratamento
Pulp analysis of teeth submitted to different types of forces: a histological study in rats
Objective: The purpose of this study was to histologically evaluate pulp and dentin under induced tooth movement (ITM) with different types of forces. Material and Methods: The maxillary right first molars of rats were submitted to movement with continuous (CF), continuous interrupted (CIF) and intermittent (IF) forces during 5, 7 and 9 days with nickel-titanium (NiTi) closed-coil springs exerting 50cN force magnitude. The groups were histologically evaluated as for cellularity pattern, presence of dystrophic, hemodynamic alterations in the pulp as well dentin alterations. The main observed alterations were related to hemodynamic pulp characteristics, such as presence of thrombosis, vascular congestion and hemorrhages. The hemodynamic alterations were statistically evaluated by Shapiro-Wilk normality test and analysis of variance by the Kruskall-Wallis test. Results: There was no significant differences observed between groups in the different types of applied forces and duration of ITM (vascular congestion, p=1.000; hemorrhage, p=0.305; thrombosis, p=1.000). Conclusions: Pulp tissue alterations resulting from ITM were limited to hemodynamic events, without progressing to irreversible degeneration, regardless of the type of force applied.
 
Assessment of skeletal and dental ages of children and adolescents with type 1 Diabetes Mellitus
The present study aimed to assess the skeletal and dental ages of type 1 diabetes mellitus (T1DM) patients. Therefore, panoramic and hand-wrist radiographs of 82 patients, aged between 5 and 15 years, were collected and divided into case and control groups. The case group consisted of 41 panoramic and 41 hand-wrist radiographs of T1DM patients, whereas the control group consisted of 41 panoramic and 41 hand-wrist radiographs of patients without T1DM. Skeletal age was assessed according to the method of Greulich and Pyle (1999), whereas dental age was assessed according to the method of Nolla (1960). Chi-square tests revealed no statistically significant differences between skeletal and dental ages between the case and control groups (p > 0.05). However, in the case group, the skeletal age of females was greater than that of age-matched males (p = 0.005). Considering that skeletal and dental growth of the case and control groups were closely related, clinical interventions involving orthodontics and dentomaxillofacial orthopedics should be equally performed both for healthy and specific patient groups, such as those with T1DM
Dental development of children and adolescents with cleft lip and palate
Aim: To evaluate the dental development of Brazilian children and adolescents with cleft lip and palate. Methods: The sample consisted of 107 panoramic radiographs of children and adolescents with cleft lip and/or palate (cleft group) and 107 panoramic radiographs of children and adolescents without cleft lip and/or palate (control group), with chronological ages ranging from 6 to 15 years, matched in gender and chronological age within 60 days. Radiographs were digitized and masked and dental age was assessed using the method described by Demirjian et al. (1973). Three trained examiners conducted the assessments. Each examiner evaluated the radiographs three times. Data were statistically analyzed using non-parametric tests and univariate linear regression (p<0.05). Results: The dental age was overestimated in relation to the chronological age in both groups (p<0.0001). Compared to the control group, there was a delay in the dental age in the cleft group of 0.17 years (2.1 months). However, no statistically significant difference in the dental age between the cleft and the control group was found even when considering the different cleft types (p=0.152). Conclusions: There was no statistically significant difference in the dental age between the cleft and the control groups. The evaluation of dental development in individuals with cleft lip and palate should be approached in the same way as in individuals without clefts, with a focus on the individualization of diagnosis and treatment planning.Display Diferencial (DD) Ă© uma tĂ©cnica amplamente utilizada em estudos de expressĂŁo diferencial. A maioria desses estudos envolvendo espĂ©cies de peixes está restrita a espĂ©cies da AmĂ©rica do Norte e Europa ou a espĂ©cies comerciais, como os salmoniformes. Estudos relacionados a peixes da AmĂ©rica do Sul sĂŁo ainda pouco explorados. Desse modo, o presente trabalho teve como objetivo descrever modificações na tĂ©cnica de DD, a fim de melhorar os resultados relacionados ao isolamento de DETs (Transcritos Diferencialmente Expressos), utilizando Leporinus macrocephalus, peixe explorado comercialmente na AmĂ©rica do Sul, como espĂ©cie para tal delineamento. Diferentes abordagens de DDRT-PCR foram desenvolvidas a partir de amostras de tecido cerebral e os produtos das reações foram analisados em gel de poliacrilamida 6% corados com 0,17% de nitrato de Prata (AgNO3). A utilização de reações de PCR sob condições de elevada estringĂŞncia e oligonucleotĂdeos mais longos, com base em sequĂŞncias cerne de VNTR (NĂşmero Variável de Repetições em Tandem), mostrou melhores resultados quando comparada a condições de baixa estringĂŞncia e ao uso de oligonucleotĂdeos decâmeros. A estratĂ©gia empregada permitiu o isolamento de transcritos diferencialmente expressos em machos e fĂŞmeas adultos de L. macrocephalus. Este estudo evidencia que modificações no mĂ©todo de DDRT-PCR garantem o melhor isolamento de DETs a partir de diferentes tecidos de peixes e asseguram a obtenção de dados mais sĂłlidos relacionados a essa abordagem
Dental development of children and adolescents with cleft lip and palate
evaluate the dental development of Brazilian children and adolescents with cleft lip and palate. Methods: The sample consisted of 107 panoramic radiographs of children and adolescentes with cleft lip and/or palate (cleft group) and 107 panoramic radiographs of children and adolescentes without cleft lip and/or palate (control group), with chronological ages ranging from 6 to 15 years, matched in gender and chronological age within 60 days. Radiographs were digitized and masked and dental age was assessed using the method described by Demirjian et al. (1973). Three trained examiners conducted the assessments. Each examiner evaluated the radiographs three times. Data were statistically analyzed using non-parametric tests and univariate linear regression (p<0.05). Results: The dental age was overestimated in relation to the chronological age in both groups (p<0.0001). Compared to the control group, there was a delay in the dental age in the cleft group of 0.17 years (2.1 months). However, no statistically significant difference in the dental age between the cleft and the control group was found even when considering the different cleft types (p=0.152). Conclusions: There was no statistically significant difference in the dental age between the cleft and the control groups. The evaluation of dental development in individuals with cleft lip and palate should be approached in the same way as in individuals without clefts, with a focus on the individualization of diagnosis and treatment plannin
Orthodontic Treatment of Ankylosed Maxillary Incisor through Osteogenic Distraction and Simplified Biomechanics
Ankylosed teeth may have a significant esthetic and functional impact especially at the anterior segment of the upper arch. Treatment of ankylosed teeth is challenging. The objective of this case report is to describe a clinical case in which an ankylosed tooth was treated with the use of osteogenic distraction associated with simplified orthodontic biomechanics. A 17-year-old female Caucasian patient presented with a Class II malocclusion, severe maxillary dental crowding, moderate mandibular dental crowding, anterior open bite, upper midline deviation to the right, and upper right central incisor in infraocclusion due to ankylosis. Treatment involved the use of the ankylosed tooth as anchorage for the distalization of the right upper segment to correct the Class II malocclusion and to create space prior to surgery. After one week of surgical osteotomy, traction of the tooth and bone segment was initiated with the use of intermaxillary elastics. The ankylosed tooth was moved to the desired position. Bone formation and mucogingival tissue adaptation were observed. Thus, esthetic and functional improvement was achieved. Osteogenic distraction associated with simplified orthodontic biomechanics is an alternative to the treatment of ankylosed teeth which can replace the use of distractor screws, making treatment simpler and more accessible
Pulp analysis of teeth submitted to different types of forces: a histological study in rats
Abstract Objective: The purpose of this study was to histologically evaluate pulp and dentin under induced tooth movement (ITM) with different types of forces. Material and Methods: The maxillary right first molars of rats were submitted to movement with continuous (CF), continuous interrupted (CIF) and intermittent (IF) forces during 5, 7 and 9 days with nickel-titanium (NiTi) closed-coil springs exerting 50cN force magnitude. The groups were histologically evaluated as for cellularity pattern, presence of dystrophic, hemodynamic alterations in the pulp as well dentin alterations. The main observed alterations were related to hemodynamic pulp characteristics, such as presence of thrombosis, vascular congestion and hemorrhages. The hemodynamic alterations were statistically evaluated by Shapiro-Wilk normality test and analysis of variance by the Kruskall-Wallis test. Results: There was no significant differences observed between groups in the different types of applied forces and duration of ITM (vascular congestion, p=1.000; hemorrhage, p=0.305; thrombosis, p=1.000). Conclusions: Pulp tissue alterations resulting from ITM were limited to hemodynamic events, without progressing to irreversible degeneration, regardless of the type of force applied