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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo in vitro de um protocolo de retratamento endodôntico realizado com o Sistema Protaper Next em molares inferiores

Arruda, Etienny da Silva, 92-99170-4047 12 April 2017 (has links)
Submitted by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2017-08-16T15:02:36Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação - Etienny S. Arruda.pdf: 1036150 bytes, checksum: da9374202f42a247cfc89a0badd0cee2 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2017-08-16T15:04:58Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação - Etienny S. Arruda.pdf: 1036150 bytes, checksum: da9374202f42a247cfc89a0badd0cee2 (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2017-08-16T15:05:24Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação - Etienny S. Arruda.pdf: 1036150 bytes, checksum: da9374202f42a247cfc89a0badd0cee2 (MD5) / Made available in DSpace on 2017-08-16T15:05:24Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Dissertação - Etienny S. Arruda.pdf: 1036150 bytes, checksum: da9374202f42a247cfc89a0badd0cee2 (MD5) Previous issue date: 2017-04-12 / FAPEAM - Fundação de Amparo à Pesquisa do Estado do Amazonas / The purpose of this study was to evaluate a protocol for endodontic retreatment, using Protaper Next instruments, to evaluate the occurrence of apical transportation using CT. To perform the experiment, 40 mandibular molars were selected, with mesial root canal curvature between 30° and canal curvature radius less than or equal to 10 mm. Size 10 K-type instruments were used to determine the presence of independent foramen. In order to standardize the samples, the crowns were partially sectioned in 16 mm and all the specimens were inserted in resin blocks, to standardize the tomographies in the same position before, during and after instrumentation and retreatment. They were also submitted to the same instrumentation and obturation process, and were then randomly separated (n = 10) into four experimental groups: PTU group, in which the instrument used to remove gutta-percha was Protaper F2 (25.08); Group R25 and Group X2 where the Reciproc - R25 (25.08) and Protaper Next - X2 (25.06) instruments were used for the same purpose, respectively; And Group X3, where the X2 instruments were used sequentially for the removal of gutta-percha and X3 (30.07) for channel remodeling, both belonging to the Protaper Next system. Apical deviation was assessed by applying formulas to values obtained before and after instrumentation, and with the data obtained it was also possible to analyze centering ratio and percentual area increase. Data were subjected to the Kruskal-Wallis Test and the Dunn Multiple Comparisons Test. The results of the apical deviation presented no significant difference between the experimental groups (p <0.05). The methodology and the results lead to the conclusion that the experimental groups did not produce a statistically significant difference in apical deviation. / O objetivo do presente estudo foi avaliar a viabilidade de um protocolo de retratamento endodôntico, utilizando instrumentos Protaper Next, avaliando a ocorrência de transporte apical em raízes mesiais curvas de molares inferiores. Foram selecionados 40 molares inferiores com grau de curvatura da raiz mesial de aproximadamente 30° e raio de curvatura menor ou igual a 10 mm. Com o auxílio de instrumentos tipo K #10, avaliou-se a presença de forames independentes. Com o objetivo de padronizar o as amostras, as coroas foram parcialmente seccionadas em 16 mm e todos os corpos de prova foram inseridos em blocos de resina, para padronização das tomografias na mesma posição antes, durante e após a instrumentação e retratamento. Também foram submetidas ao mesmo processo de instrumentação e obturação, e só depois foram separadas aleatoriamente (n=10) em quatro grupos experimentais: Grupo Protaper Universal (PTU), no qual o instrumento utilizado para a remoção da gutta-percha era a Protaper F2 – 25.08; Grupo Reciproc e Grupo Protaper Next X2 onde para a mesma finalidade eram empregados os instrumentos Reciproc R25 – 25.08 e Protaper Next X2 – 25.06, respectivamente; e o Grupo Protaper Next X3, onde eram utilizados sequencialmente os instrumentos X2 para a remoção da gutta-percha e o X3 (30.07) para remodelação do canal, ambos pertencentes ao sistema Protaper Next. A análise do desvio apical se deu pela aplicação de fórmulas aos valores obtidos antes e após a instrumentação e com os dados obtidos também foi possível analisar o índice de centralização dos intrumentos bem como o aumento percentual da área proporcionado por eles. Os dados obtidos foram submetidos a testes de Kruskall-Wallis e teste de Múltiplas Comparações de Dunn. Os resultados do desvio apical não mostraram diferenças significantes entre os grupos avaliados (p < 0,05). Com base na metodologia empregada e nos resultados obtidos, concluiu-se que não houve, entre os grupos experimentais, diferença significante em relação à produção de desvio apical.
2

M?todos de mensura??o de curvaturas radiculares e a influ?ncia do glide path na manuten??o da centraliza??o e no transporte apical preparos endod?nticos : revis?es sistem?ticas e an?lise cr?tica

Hartmann, Rafael Chies 12 November 2018 (has links)
Submitted by PPG Odontologia (odontologia-pg@pucrs.br) on 2018-12-12T18:58:35Z No. of bitstreams: 1 RAFAEL_CHIES_HARTMANN_TESE.pdf: 1515467 bytes, checksum: 0787dc0b8180f2af60c74c918444dab7 (MD5) / Approved for entry into archive by Sheila Dias (sheila.dias@pucrs.br) on 2018-12-14T13:33:17Z (GMT) No. of bitstreams: 1 RAFAEL_CHIES_HARTMANN_TESE.pdf: 1515467 bytes, checksum: 0787dc0b8180f2af60c74c918444dab7 (MD5) / Made available in DSpace on 2018-12-14T16:01:26Z (GMT). No. of bitstreams: 1 RAFAEL_CHIES_HARTMANN_TESE.pdf: 1515467 bytes, checksum: 0787dc0b8180f2af60c74c918444dab7 (MD5) Previous issue date: 2018-11-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The great majority of the roots present curvatures and the knowledge of these curves allows the clinician a better choice for endodontic therapy. Therefore, it is necessary to use methods that can measure these curvatures with good accuracy levels. The preparation of a glide path prior to root canal instrumentation is widely suggested because can avoid possible operative errors, such as loss of centralization and apical transportation, especially in curved root canals. There is no consensus concerning the methods that can be used to measure radicular curvatures, nor regarding the efficacy of glide path. The present investigation has the objective of performing two systematic reviews in order to answer the following questions: 1- What are the methods, described in the literature, used to measure the angles and other characteristics of the curvatures of the root canals? 2- The glide path is able to reduce the apical transportation and the loss of centralization of the endodontic preparation? Also, how does the glide path - manual or engine-driven - result in minor operative errors? Methods: Using the appropriate terms for each review, electronic searches were performed on six databases: PubMed, PubMed Central (PMC), Embase, Scopus, EBSCO Dentistry & Oral Sciences Source (DOSS) and Virtual Health Library (VHL). We used studies published in English or in any language with Latin alphabet. There was no time limit for publications. In addition, in the second review, the included studies, the risk of biases was analyzed. Results: In review 1, about the methods of measurement of curvatures, 6,336 studies were obtained and of these, 31 articles that described innovative methods. Eleven studies described the methods used to measure only the angle of the radicular curvatures, for which they used 2D images. 13 studies also used 2D images, however, in addition to the angles, evaluated other features of the root canal curvatures (position, length, direction, height and shape). In addition, seven studies evaluated curvatures using 3D methods. In review 2, regarding glide path, 2,146 articles were obtained, and 18 studies fulfilled the inclusion criteria, composing the final analysis. 9 studies evaluated the glide path per se and 11 evaluated the impact of glide path on final engine-driven endodontic preparation. Conclusion: Revision 1 suggested that most methods for root canal curvature measurement have potential clinical applications; however, there is a lack of consensus on the ideal technique. In addition to the angle, other features, such as radius and position of curvature, need to be measured and should be considered when evaluating root canal curvature in both clinical and research purposes. Revision 2 revealed that engine-driven confection of glide path, when compared to manual, presents similar or better results of apical transportation and maintenance of root canal centralization. It was also observed that the preparation of glide path, prior to endodontic preparation, is associated with similar results or with a reduction of the apical transportation and the maintenance of the preparation centralization. It was also observed that deviations occur in all situations. / A grande maioria dos condutos apresenta curvaturas e o conhecimento destas curvaturas permite ao cl?nico uma melhor escolha da terap?utica endod?ntica. Para tanto, faz-se necess?rio o emprego de m?todos que possam medir essas curvaturas com bons n?veis de acur?cia. A confec??o de um glide path pr?vio ? instrumenta??o dos canais radiculares ? amplamente sugerida, pois pode evitar poss?veis erros operat?rios, tais como a perda de centraliza??o do preparo e o transporte apical, especialmente em canais radiculares curvos. Como n?o h? consenso quanto aos m?todos que podem ser utilizados na medi??o das curvaturas radiculares, tampouco referente a efic?cia do glide path, a presente investiga??o tem o objetivo de realizar duas revis?es sistem?ticas, a fim de responder ?s seguintes quest?es: 1- Quais s?o os m?todos, descritos na literatura, empregados na mensura??o dos ?ngulos e demais caracter?sticas das curvaturas dos canais radiculares? 2- O glide path ? capaz de reduzir o transporte apical e a perda de centraliza??o do preparo endod?ntico? Al?m disso, qual a forma de confec??o do glide path ? manual ou motorizada ? resulta em menores erros operat?rios? M?todos: Utilizando os termos apropriados para cada revis?o, foram realizadas buscas eletr?nicas em seis bases de dados: PubMed, PubMed Central (PMC), Embase, Scopus, EBSCO Dentistry & Oral Sciences Source (DOSS) e Virtual Health Library (VHL). Foram utilizados estudos publicados em ingl?s ou em qualquer idioma com alfabeto latino n?o houve qualquer limite temporal para as publica??es. Al?m disso, na segunda revis?o, os estudos inclu?dos tiveram o risco de vieses analisado. Resultados: Na revis?o 1, acerca dos m?todos de mensura??o das curvaturas, foram obtidos 6.346 estudos e destes, restaram 31 artigos que descreviam m?todos inovadores. Onze estudos foram descritos a fim de mensurar apenas o ?ngulo das curvaturas radiculares, para isso utilizaram 9 imagens em 2D. 13 estudos utilizaram tamb?m imagens em 2D, entretanto, al?m dos ?ngulos avaliaram outras caracter?sticas das curvaturas dos canais radiculares (posi??o, comprimento, dire??o, altura e forma). Al?m disso, sete estudos avaliaram as curvaturas atrav?s de m?todos em 3D. J? na revis?o 2, a respeito do glide path, obteve-se 2.146 artigos, sendo que 18 estudos preencheram os crit?rios de inclus?o, compondo a an?lise final. 9 pesquisas avaliaram a confec??o do glide path per se e 11 avaliaram a repercuss?o do glide path no preparo endod?ntico motorizado final. Conclus?o: a revis?o 1 sugeriu que a maioria dos m?todos de mensura??o de curvaturas dos canais radiculares tem potenciais aplica??es cl?nicas, no entanto, h? uma falta de consenso sobre a t?cnica ideal. Al?m do ?ngulo, outros fatores, como raio e posi??o da curvatura, precisam ser mensurados e devem ser levados em considera??o ao se avaliar a curvatura do canal radicular tanto em tratamentos cl?nicos como em ambientes de pesquisa. J? a revis?o 2 revelou que a confec??o motorizada, quando comparada com a confec??o manual, do glide path apresenta resultados similares ou melhores de transporte apical e manuten??o da centraliza??o do canal radicular. Observou-se, tamb?m, que a confec??o do glide path, previamente ao preparo endod?ntico, est? associada com resultados similares ou com a redu??o do transporte apical e a manuten??o da centraliza??o do preparo. Tamb?m foi observado que ocorrem desvios em todas as situa??es.

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