Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 9 de 9
Filtrar
Mais filtros










Intervalo de ano de publicação
2.
Iran Endod J ; 14(2): 115-121, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-36855448

RESUMO

Introduction: The aim of the present study was to compare the efficacy of four NiTi instruments with different properties (shape memory and control memory), in both rotary and reciprocating motions, during retreatment procedures. Methods and Materials: Mesial canals of thirty-two mandibular molars were instrumented, obturated, and then scanned with" Cone-beam Computed Tomography" (CBCT). Teeth were randomly divided into 4 groups (n=8) according to each system: "Shape Memory" (SM) instruments including Reciproc (R25 file) and ProTaper Next (X3 and X2 file), "Controlled Memory" (CM) instruments including WaveOne Gold (Primary file) and Hyflex (30.06 and 25.06 file). The specimens were rescanned after retreatment procedures. The volume of the residual material left inside the canals, the operating time and the fractured files were analyzed. ANOVA and student t-tests were used for statistical analysis. Results: There were no significant differences in the percentage of the residual filling material or requiring time amongst different groups of instruments (P>0.05). However, CM instruments presented the highest frequency of fractured files [2 SM instruments (12.5%) and 7 CM instruments (43.75%)] with a significant difference (P=0.023). Conclusions: This ex vivo study showed that CM and SM instruments can remove filling materials from mandibular mesial root canals during retreatment procedures; nonetheless the CM instruments had a higher frequency of fractured files. No system was able to completely remove the filling materials. Therefore, additional procedures and techniques are needed to improve root canal cleanliness.

3.
Int. j. morphol ; 33(3): 895-901, Sept. 2015. ilus
Artigo em Inglês | LILACS | ID: lil-762561

RESUMO

The aims of this study were to determine the frequency of the Ponticulus posticus (PP) in the C1 vertebra and the Sella Turcica Bridge (STB) and Clinoid enlargement (CLEN) variants in two samples of Peruvian cleft lip and palate patients (CLP), determine if there are significant differences between sexes and compare the results with two samples of non-cleft controls. The digital images of the lateral cephalometric radiography of 163 and 150 CLP patients were utilized to determine the frequency of PP and, STB-CLEN respectively. The controls were composed of 1056 and 417 radiography of non-cleft patients. The chi-square statistic was utilized to determine if there were significant differences between genres for the CLP patients, and between the CLP and control samples. The confidence level was set at p<0.05. The frequency of PP (partial and complete) in CLP patients was 11.04% (18 cases) and 6.13% (10 cases) respectively; both of them were more frequent in males and there were no significant differences between sexes and between the CLP and control groups (p>0.05). The frequency of STB and CLEN in CLP patients was 6% (9 cases) and 8.7% (13 cases) respectively; both of them were more frequent in males and there were no significant differences between sexes and between the CLP and control samples for the STB (p>0.05). The frequency of CLEN was significantly lower (p<0.05) in the cleft group and in the female cleft group when compared to the control group. The frequencies of the Ponticulus Posticus, Sella Turcica Bridge and Clinoid Enlargement were similar to the control group and should not be considered as Cleft Lip and Palate associated anomalies; the frequency of the Clinoid Enlargement was significantly lower in cleft patients and this could be confirmed through studies centered on the Clinoid apophysis.


Los objetivos del estudio fueron determinar la frecuencia del Ponticulus Posticus (PP) y Puente selar - Alargamiento clinoideo (PS­AC) en dos muestras de pacientes Peruanos con fisura labiopalatina, junto con determinar si hay diferencias significativas entre sexos y comparar los resultados con dos muestras de controles sin fisura labiopalatina. Imágenes de radiografías cefalométricas laterales fueron utilizadas para determinar la frecuencia de PP (n= 163) y PS­AC (n=150). Los controles estuvieron conformados por 1056 y 417 radiografías de pacientes sin fisura labiopalatina. La prueba chi-cuadrado fue utilizada para determinar si existen diferencias significativas entre los sexos de los pacientes con fisura labiopalatina, y también entre las muestras de fisura labiopalatina y los controles. El nivel de confianza se determinó en p<0,05. En pacientes con fisura labiopalatina, la frecuencia de PP (parcial y completo) fue de 11,04% y 6,13% respectivamente; fue más frecuente en hombres y no se encontraron diferencias significativas entre sexos y entre la comparación entre muestras (p>0,05). La frecuencia de PS y AC fue de 6% y 8,7%, respectivamente; ambos fueron más frecuentes en hombres y no se encontraron diferencias significativas entre sexos; no se encontró diferencias significativas entre las muestras de fisura labiopalatina y los controles en el caso del PS. La frecuencia de AC fue significativamente menor en el grupo de fisura labiopalatina y en las mujeres con fisura labiopalatina respecto a la población sin fisura labiopalatina (p<0,05). Las frecuencias de PP y PS fueron similares a las del grupo control y no deberían ser consideradas como anomalías asociadas a la fisura labiopalatina; la frecuencia del AC fue significativamente menor en pacientes con fisura labiopalatina, y tampoco debería considerarse como una anomalía asociada; este hallazgo podría ser confirmado en futuros estudios centrados en las apófisis clinoides.


Assuntos
Humanos , Fenda Labial/patologia , Fissura Palatina/patologia , Sela Túrcica/patologia , Cefalometria , Atlas Cervical/patologia , Ossificação Heterotópica , Peru/epidemiologia
4.
J Forensic Odontostomatol ; 33(2): 9-17, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26851634

RESUMO

The dental pattern is defined as the combination of distinct codes assigned to describe specific tooth conditions including virgin, missing, and restored teeth that comprise the complete dentition or from discrete groups of teeth. This pattern can be then compared to the dentition of individual/s in an attempt to determine positive identification. The aims of the present investigation were to study and determine the diversity of dental patterns in Peruvian citizens based on a sample of panoramic radiographs. Digital panoramic radiographs of 900 adult Peruvian patients (450 female and 450 male) were evaluated to determine the dental patterns. The most frequent dental patterns found in the complete dentition, maxillae, upper-anterior and lower-anterior sextants were all-virgin-teeth (0.3%), all-extracted teeth (1.9%), all-virgin teeth (1%) and all-virgin-teeth (34.2% and 72.3%) respectively. The diversity was calculated by the use of the Simpson's diversity index, the resulting values for the full-dentition, maxilla and mandible were over the 99.8% value and were similar to those previously reported in the scientific literature. This study demonstrates the positive benefit of dental patterns in the process of identification. Additionally a combination of codes is proposed that could prove useful in cases where a better radiographic description is required.


Assuntos
Dentição , Radiografia Panorâmica , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Peru , Estudos Retrospectivos , Adulto Jovem
5.
Int. j. odontostomatol. (Print) ; 8(3): 377-383, dic. 2014. ilus
Artigo em Inglês | LILACS | ID: lil-734715

RESUMO

The design of the present study was transversal and descriptive, the objective was to determine the prevalence and distribution of supernumerary teeth in panoramic radiography from Peruvians in Lima - Peru. The panoramic radiography of 1754 non-syndromic patients between 3 to 20 years of age were evaluated in order to determine the presence of supernumerary teeth and associated variables like number of supernumerary teeth, affected jaw and region, type according to shape, type according to location, eruption status and complications. The prevalence of supernumerary teeth was 4.62% (81 patients, 113 supernumerary teeth), 2.22% in females (39 patients, 53 supernumerary teeth) and 2.4% and in the males (42 patients, 60 supernumerary teeth). A singly supernumerary tooth (72.8%), in the maxilla (72.8%) and the antero-superior region (55.8%) was the most frequent presentation; the conical (39%) and supplementary shape (25.6%) along with the anterior supernumerary teeth (34.5%) and parapremolar supernumerary teeth (31.9%) were the most frequent shape an location found; the intraosseous (46.9%) and impacted (24.8%) were the most frequent eruption status found; and the malposition of nearby teeth (38.1%) was the most frequent complication. The prevalence of supernumerary teeth in Peruvians was higher than that reported in the literature and the distribution of the supernumerary teeth associated variables was similar to those reported in the literature.


El presente estudio es de tipo transversal y descriptivo. El objetivo fue determinar la prevalencia y distribución de dientes supernumerarios en radiografías panorámicas de pacientes peruanos. Se evaluaron las radiografías panorámicas de 1754 pacientes entre los 3 a 20 años de edad para determinar la prevalencia de dientes supernumerarios así como las variables de cantidad, maxilar afectado, región afectada, forma, ubicación, estatus de erupción y complicaciones. La prevalencia de dientes supernumerarios fue de 4,62% (81 pacientes, 113 dientes supernumerarios), 2,22% en mujeres (39 pacientes, 53 dientes supernumerarios) y 2,4% en hombres (42 pacientes, 60 dientes supernumerarios). Los dientes supernumerarios singulares (72,8%), ubicadas en el maxilar (72,8%) y en zona anterosuperior (55,8%) fue la presentación más frecuentemente encontrada; la forma cónica (39%) y suplementaria (25,6%) junto a los dientes supernumerarios anteriores (34,5%) y para premolares (31,9%); evolución intraósea (46,9%) e impactadas (24,8%); y la alteración de dientes adyacentes (38,1%) fueron las formas, locaciones, estatus de erupción y alteraciones más frecuentementes encontradas. La prevalencia de dientes supernumerarias en peruanos fue mayor que la reportada en la literatura; la distribución de las variables relacionadas a los dientes supernumerarios fue similar a lo reportado en la literatura.

6.
Int. j. morphol ; 32(1): 54-60, Mar. 2014. ilus, tab
Artigo em Inglês | LILACS | ID: lil-708723

RESUMO

The Ponticulus posticus is an anomalous ossification of unknown origin that arches backward from the superior articular process to the posterior arch of the Atlas vertebra, it can be complete or partial and houses vascular and nervous elements; it is diagnosed by lateral cervical radiography, cephalometric radiography or CT scans. The purpose for the present study was to determine the frequency of partial and complete Ponticulus posticus in lateral cephalometric radiography of Peruvian patients and identify any possible genre or age group associations. The study consisted in reviewing 1056 lateral cephalometric radiography of patients between 3­56 years old in search of partial or complete Ponticulus posticus. The mean age of subjects studied was 14.05±7.43 years old. The Ponticulus posticus frequency was 19.79%, the partial Ponticulus posticus frequency was 11.08% and the complete Ponticulus posticus frequency was 8.71%; Cramer´s V and ETA statistics found not significant association between the PP and the genre or the age groups (p>0.05). The Ponticulus posticus is not an infrequent radiographic finding, our results are similar to those reported in the Americas and similar to different for other ethnic groups, we confirm that the Ponticulus posticus is not associated with genre or age and we reviewed the importance of the Ponticulus posticus in the prognosis of the Atlas-Axis surgical stabilization.


El ponticulus posticus es una osificación anómala de origen desconocido en forma de arco que va desde el proceso articular hacia el arco posterior del atlas; puede ser completo o parcial y aloja elementos vasculares y nerviosos; su diagnóstico se realiza mediante la radiografía lateral cervical, radiografía cefalométrica o tomografía computarizada. El propósito del estudio fue determinar la frecuencia del ponticulus posticus parcial y completo en radiografías cefalométricas de pacientes peruanos y determinar las diferencias de acuerdo al sexo y edad. Se revisaron 1056 radiografías cefalométricas de pacientes entre los 3 a 56 años de edad en busca de ponticulus posticus parcial o completo. La edad promedio fue de 14,05±7,43 años. La frecuencia de ponticulus posticus en general fue 19,79%, con el tipo parcial en un 11,08% y de tipo completo en un 8,71%. Se observó una mayor frecuencia en los hombres (10,22%) que en mujeres (9,56%). No se encontraron diferencias significativas entre la presencia de ponticulus posticus parcial o completo con respecto al sexo y a la edad (p>0,05). El ponticulus posticus no es un hallazgo infrecuente, nuestros resultados fueron similares a los reportados para pacientes americanos y similares a distintos para otros grupos étnicos, se confirmo mediante estadística que el ponticulus posticus no se encuentra asociado a la edad y se discute la importancia de la presencia del ponticulus posticus en el pronóstico de la estabilización del complejo vertebral atlas-axis.


Assuntos
Humanos , Masculino , Adolescente , Adulto , Vértebras Cervicais , Vértebras Cervicais/anormalidades , Peru , Atlas Cervical , Atlas Cervical/anormalidades , Fatores Sexuais , Cefalometria , Cefalometria/métodos , Fatores Etários , Ossificação Heterotópica
7.
Int. j. morphol ; 31(2): 373-377, jun. 2013. ilus
Artigo em Inglês | LILACS | ID: lil-687071

RESUMO

The purpose for the present study was to determine the frequency of sella turcica bridge and clinoid enlargement on lateral cephalometric plain film radiography from peruvians patients who attended our radiological center and identify any possible genre or age group associations. The sella turcica from 417 lateral cephalometric plain film radiography was evaluated in order to determine the presence of sella turcica bridge (fusion between the anterior and posterior clinoid process) or clinoid enlargement related to the Sella (S) cephalometric point. The sella turcica bridge and clinoid enlargement frequency was 4.31percent (n=18), and 16.3 percent (n=68). Cramer´s V and ETA statistics found, by separately, non significant association (p > 0.05) between sella turcica bridge and clinoid enlargement with respect to sex, and age groups (under 18 and over 18). The sella turcica bridge and clinoid enlargement are not so infrequent findings in the population studied, our results are similar to those reported in the literature. The existence of a sella turcica bridge or a clinoid enlargement must be considered as a structural anomaly that may influence the prognosis of surgical procedures of the sella turcica.


El propósito del estudio fue determinar la frecuencia de puente selar y alargamiento clinoideo en radiografías laterales cefalométricas de pacientes peruanos que asistieron a nuestro centro radiográfico entre enero a mayo del 2011 e identificar posibles asociaciones de sexo ó edad. El área de la silla turca de 417 radiografías cefalométricas laterales fue evaluada para determinar la presencia de puente selar (fusión entre los procesos clinoides) o alargamiento de los procesos clinoides anterior o posterior en relación con el punto cefalométrico Sella (S). La frecuencia de puente selar fue de 4.31por ciento (n=18), la frecuencia de alargamiento clinoideo fue de 16.3 por ciento (n=68). Los análisis estadísticos V de Kramer y ETA no encontraron asociación significativa entre el puente selar y alargamiento clinoideo con respecto al sexo y a la edad (p>0.05). El puente selar y el alargamiento clinoideo no son hallazgos radiográficos tan infrecuentes en la población estudiada; nuestros resultados son similares a los encontrados en la literatura. La presencia del puente selar y alargamiento clinoideo debe tenerse en cuenta como una anomalía estructural que puede influir en el pronóstico de los procedimientos quirúrgicos en la zona de la silla turca.


Assuntos
Humanos , Masculino , Adolescente , Adulto , Feminino , Pré-Escolar , Criança , Adulto Jovem , Pessoa de Meia-Idade , Calcinose , Cefalometria , Ossificação Heterotópica , Sela Túrcica/anormalidades , Sela Túrcica , Peru
8.
Acta Odontol Latinoam ; 24(3): 265-71, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22550820

RESUMO

AIM: The purpose of the present study was to describe the posteroanterior cephalometric norm values from Hispanic Americans Peruvian non adults patients between years 2009 to 2010, identify possible differences between sexes and compare our results with similar studies in the literature. MATERIAL AND METHODS: Data from posteroanterior cephalograms from 318 patients (177 females and 141 males) between 9 and 18 years old were collected from our database; mean and standard deviation were calculated for each gender and age group. RESULTS: Independent samples T-test found statistically significant differences between males and females results in the intermolar width, right molar to maxillae distance, nasal width, nasal height, maxillary width, mandibular width and facial width. CONCLUSIONS: statistically differences between sexes were found in seven from twelve transversal measurements. The norm values found in this study are similar to those reported by Ricketts'.


Assuntos
Cefalometria , Hispânico ou Latino , Adolescente , Criança , Feminino , Humanos , Masculino , Peru/etnologia , Valores de Referência
9.
Acta odontol. latinoam ; 24(3): 265-271, 2011. ilus
Artigo em Inglês | LILACS | ID: lil-668287

RESUMO

El propósito del presente estudio fue de establecer valores promedio de las medidas transversales del análisis posteroanterior de Ricketts en pacientes Peruanos Hispano Americanos no adultos que asistieron a nuestro centro de radiología entre los años 2009 y 2010, identificar posibles diferencias entre géneros y contrastar nuestros hallazgos con estudios similaresen la literatura. Materiales y método: Se recolectaron los valores de 12 medidas transversales 318 análisis de cefalometría posteroanterior de Ricketts (177 mujeres y 141 hombres) denuestra base de datos; para cada medida se calculó el promedio y la desviación estándar de cada género y cada grupo etáreo. Resultados: La prueba estadística T encontró diferenciasestadísticamente significativas entre las medidas de los géneros masculino y femenino en el ancho intermolar, distancia del molar derecho al maxilar, ancho nasal, altura nasal, anchomaxilar, ancho mandibular y ancho facial. Conclusiones: Se encontraron diferencias estadísticamente significativas en las medidas ancho interpolar (IM), distancia del molarderecho al maxilar (RMMD), ancho nasal (NC-CN), altura nasal (NH), ancho maxilar (JL-JR), ancho mandibular (AG-GA) y ancho facial (ZA-AZ).Los valores encontrados en la población estudiadason similares a los valores promedio reportados por Ricketts.


Assuntos
Humanos , Masculino , Adolescente , Feminino , Criança , Cefalometria/métodos , Características da População , Valores de Referência , Peru , Interpretação Estatística de Dados
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...