Magister Chirurgiae Dentium - MChD (Prosthodontics) / Gaps or voids between walls of root canal and obturation material may lead to re-infection of the obturated root canal. Therefore, adaptation of the obturation material to dentine walls is essential for the success of root canal treatment.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 4 uppsatser.

O objetivo do presente estudo foi analisar o preenchimento de canais radiculares após a obturação com sistema RealSeal®, em relação à técnica de condensação lateral, do cone único e termoplastificada, por meio do software Leica Qwin. Para tanto, vinte e sete incisivos centrais inferiores foram preparados com limas rotatórias K 3Endo, hipoclorito de sódio 1,0%, pH 11 associado a Endo PTC e irrigação final relaizada com EDTA 17%. Para a obturação, dividiu-se os espécimes em três grupos, de acordo com a técnica: Grupo I (condensação lateral), Grupo II (cone único), Grupo III (termoplastificada). Após a obturação dos dentes, os mesmos permaneceram em 100% de umidade e 37 graus C, durante 7 dias. Depois disso, os dentes foram incluídos em resina ortoftálica e os blocos de resina contendo os espécimes passaram por micrótomo de tecidos duros, obtendo-se secções tranversais do terço apical, médio e cervical dos canais obturados. Os cortes foram analisados em estereomicroscópio em aumento de 40 vezes, e as imagens obtidas avaliadas no programa Leica Qwin, determinando a porcentagem de área de cimento, material principal e falhas. Os resultados obtidos foram submetidos a análise estatística pelo teste Kruskal-Wallis que determinou diferença estatística ao nível de 5%. Houve diferença entre as técnicas obturadoras, sendo a técnica de cone único a que apresentou maior porcentagem de cimento obturador nos três terços; a termoplastificada apresentou a maior porcentagem de Resilon, mas no terço médio apresentou a maior porcentagem de falhas. / The aim of this study was to compare the proportion of core material, endodontic sealer and voids in the lateral condensation, single cone and thermoplastic techniques, through software Leica QWin. Twenty-seven central mandibular incisors were prepared using K3 Endo with sodium hypochlorite 1,0%, pH 11, Endo-PTC and EDTA 17% for final rising. The roots were, thereafter, randomly assigned into three groups according the filling technique: Group I (lateral condensation), Group II (single cone) and Group III (thermoplastic) and RealSeal® system. After this, the roots were stored for seven days at 37 grays Celsius and 100% relative humidity. Specimens were then embedded in resin and cross-sections were obtained by cervical, middle and apical thirds using a microtome. The samples were analyzed in stereomicroscopy at a magnification of 40 times and the digital image were taken and transferred to software Leica QWin. This software was used to calculate the cross-section area of Resilon, sealer and voids. The results were compared statistically by Kruskall-Wallis test and showed 5% significant difference. The single cone was the most percentage of sealer, thermoplastic was the most of Resilon, but with the most percentage of voids in middle third.

Fluid-tight obturation of the root canal space is an important requirement for successful root canal treatment. Gutta percha, used as a core material in combination with different sealers, is the most commonly used root filling material and is considered the gold standard. However, it does not possess all the properties of the ideal obturation material. Mineral trioxide aggregate (MTA) is a cement material based on calcium silicates (CSC). It sets by hydration, provides excellent sealing ability, is biocompatible/bioactive and has performed successfully in different clinical applications. The use of MTA as an orthograde obturation material has been proposed. However, MTA is difficult to handle and very little is known about the most appropriate technique to ensure good compaction within the shaped root canal. This research aims to investigate the performance of MTA when used as an orthograde obturation material. The effect of different times of ultrasonic activation of unset material on the incidence of voids in root canals was investigated. Manual compaction of MTA using hand pluggers without ultrasonic activation resulted in minimal void formation. Ultrasonic activation resulted in significantly higher incidence of voids. The removal of the smear layer prior to obturation with MTA resulted in a significantly reduced push-out bond strength between the MTA and radicular dentine. The apical sealing ability of MTA orthograde filling was assessed in comparison with gutta percha and sealer using a dye leakage model. It was concluded that MTA provides a better apical seal against dye penetration over a 30-day observation period. The ability of MTA to reinforce the remaining root structure in comparison with gutta percha and sealer was investigated. MTA significantly increased the resistance to vertical root fracture after one month of storage in synthetic tissue fluid. The radiopacity of MTA together with new calcium silicate cements was assessed and it was concluded that MTA was more radiopaque than gutta percha but less radiopaque than AH-plus sealer. The use of MTA as an orthograde obturation material has shown some potential of enhanced clinical performance in comparison with gutta percha and sealer in terms of sealing ability and bioactivity. However, there are certain disadvantages for obturation with this category of materials in its present form. It is important to point out that MTA is still in its early stages of development. With further improvements to its physical properties, MTA can present a valuable option for obturation of the root canal space.

Thesis (M.S.)--University of Michigan, 1989.

Thesis (M.S.)--University of Michigan, 1976.

Thesis (M.S.)--University of Michigan, 1976.

Thesis (M.S.)--University of Michigan, 1989.

Thesis (M.S.)--School of Dentistry. University of Missouri--Kansas City, 2008. / "A thesis in oral biology." Advisor: Mary P. Walker. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Aug. 07, 2009. Includes bibliographical references (leaves 39-45). Online version of the print edition.

Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2013-04-24T13:53:05Z No. of bitstreams: 1 DISS - Ricardo Muniz sec.pdf: 725636 bytes, checksum: 3b21aa104d11b0c1b7a356d87eb76f46 (MD5) / Approved for entry into archive by Rodrigo Meirelles(rodrigomei@ufba.br) on 2013-05-08T12:00:23Z (GMT) No. of bitstreams: 1 DISS - Ricardo Muniz sec.pdf: 725636 bytes, checksum: 3b21aa104d11b0c1b7a356d87eb76f46 (MD5) / Made available in DSpace on 2013-05-08T12:00:23Z (GMT). No. of bitstreams: 1 DISS - Ricardo Muniz sec.pdf: 725636 bytes, checksum: 3b21aa104d11b0c1b7a356d87eb76f46 (MD5) Previous issue date: 2004 / O Propósito deste estudo foi avaliar por meio de radiografias periapicais, o estado atual dos tratamentos endodônticos encontrados em estudantes da Faculdade de Odontologia de Montes Claros ? Funorte (Faculdades Unidas do Norte de Minas). Verificou-se a qualidade das obturações dos canais radicualres, no tocante ao limite apical e condensação da obturação, observando-se o periápice em relação à presença ou ausência de lesões. Os resultados obtidos mostraram que 38,3% de obturações endodônticas, foram considerados de boa qualidade, enquanto 61,7% apresentavam obturação de má qualidade. Quanto ao limite apical da obturação, 40,4% mostraram-se subobturadas; 44,7% respeitavam o limite cemento dentina canal, 8,5% foram obturados ao nível do ápice radiográfico radicular e apenas 6,4% apresentaram-se sobreobturados. Em relação à condensação da obturação endodôntica, 50,2% foram inadequadas. Enquanto que a presença de lesão na periápice foi da ordem de 76,6% dos casos. É necessário haver uma investigação sobre as causas que conduzem a má qualidade das obturações de modo que medidas corretivas sejam tomadas no sentido de reverter a situação / Salvador