Made available in DSpace on 2014-06-11T19:31:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-09-29Bitstream added on 2014-06-13T18:42:17Z : No. of bitstreams: 1 leonardi_dp_dr_arafo.pdf: 940436 bytes, checksum: 8202788469fea3c9b3976d6749113c75 (MD5) / Universidade Estadual Paulista (UNESP) / A evolução da endodontia ocorre continuamente de modo que sistemas, técnicas e instrumentos endodônticos têm sido criados e estudados por diversos autores por meio de diferentes métodos analisando seu desempenho. O presente estudo teve como objetivo avaliar aspectos relacionados ao preparo do canal radicular assim como também analisar os métodos de estudo empregados para este fim. Foram empregadas 10 raízes mésio-vestibulares de molares superiores humanos extraídos, as quais foram incluídas em blocos de resina e seccionadas transversalmente nos terços médio e apical. Para a instrumentação foi empregado o sistema Race. A análise do preparo foi feita por meio da Plataforma Radiográfica, do Método de Bramante e do Método Histológico. Foi observado que, diante de uma padronização dos métodos de estudo empregados, é possível obter resultados coerentes entre cada um, mesmo quando se avalia aspectos diferentes do preparo do canal radicular. Pesquisas que avaliam o mesmo aspecto do preparo podem apresentar resultados diferentes e estas diferenças podem estar associadas a variáveis inerentes a cada sistema de avaliação empregado. Em relação ao método de estudo concluiu-se que todos forneceram informações importantes para a análise do preparo do canal radicular, no entanto, não devem ser considerados individualmente. De acordo com o aspecto avaliado, um método pode complementar o outro e, desta forma, atingir resultados fidedignos. Em relação aos aspectos do preparo concluiu-se que o sistema Race mostrou ausência de desvio apical, ação sobre todas as paredes dentinárias, deslocamento do preparo em direção às paredes externa da curvatura e vestibular do canal radicular, ampliação da área nos terços médio e apical, superfícies dentinárias regulares, formato irregular e pequena quantidade de resíduos na luz do canal radicular. / There is an usually endodontic evolution thus rotary systems and techniques has been created and evaluated by several authors by different methods. The purpose of this study was to investigate root canal aspects and the methods employed to evaluate the root canal preparation. Mesiobuccal canals of ten maxillary molars extracted human were included in blocks of resin and split across the middle and apical thirds. The root canals were prepared by RaCe rotary files. The prepare analysis was done through the Radiographic Platform, Bramante method and Histological method. It was observed that before the methods standardization it can get consistent results between each one even when assessing different aspects of the root canal preparation. It was concluded that studies that evaluate the same aspect of the preparation may show different results and these are associated with variables inherent in each methodology employee. All the methods supplies important information about root canal preparation. However, it is not should be separately considered. In accord to the evaluated aspect a method can supplies the other one and get reliable results. In relation to the aspects of the preparation it was concluded that the Race system showed apical deviation absence, action on all the walls, displacement to the external curvature walls and vestibular, magnifying of the area, regular surfaces, irregular format and small amount of residues inside the root canal.

Orientador: Paulo Sérgio Cerri / Banca: Paulo Tanomaru filho / Banca: Idomeo Bonetti Filho / Banca: Marco Antônio Húngaro Duarte / Banca: Celso Kenji Nishiyama / Resumo: A evolução da endodontia ocorre continuamente de modo que sistemas, técnicas e instrumentos endodônticos têm sido criados e estudados por diversos autores por meio de diferentes métodos analisando seu desempenho. O presente estudo teve como objetivo avaliar aspectos relacionados ao preparo do canal radicular assim como também analisar os métodos de estudo empregados para este fim. Foram empregadas 10 raízes mésio-vestibulares de molares superiores humanos extraídos, as quais foram incluídas em blocos de resina e seccionadas transversalmente nos terços médio e apical. Para a instrumentação foi empregado o sistema Race. A análise do preparo foi feita por meio da Plataforma Radiográfica, do Método de Bramante e do Método Histológico. Foi observado que, diante de uma padronização dos métodos de estudo empregados, é possível obter resultados coerentes entre cada um, mesmo quando se avalia aspectos diferentes do preparo do canal radicular. Pesquisas que avaliam o mesmo aspecto do preparo podem apresentar resultados diferentes e estas diferenças podem estar associadas a variáveis inerentes a cada sistema de avaliação empregado. Em relação ao método de estudo concluiu-se que todos forneceram informações importantes para a análise do preparo do canal radicular, no entanto, não devem ser considerados individualmente. De acordo com o aspecto avaliado, um método pode complementar o outro e, desta forma, atingir resultados fidedignos. Em relação aos aspectos do preparo concluiu-se que o sistema Race mostrou ausência de desvio apical, ação sobre todas as paredes dentinárias, deslocamento do preparo em direção às paredes externa da curvatura e vestibular do canal radicular, ampliação da área nos terços médio e apical, superfícies dentinárias regulares, formato irregular e pequena quantidade de resíduos na luz do canal radicular. / Abstract: There is an usually endodontic evolution thus rotary systems and techniques has been created and evaluated by several authors by different methods. The purpose of this study was to investigate root canal aspects and the methods employed to evaluate the root canal preparation. Mesiobuccal canals of ten maxillary molars extracted human were included in blocks of resin and split across the middle and apical thirds. The root canals were prepared by RaCe rotary files. The prepare analysis was done through the Radiographic Platform, Bramante method and Histological method. It was observed that before the methods standardization it can get consistent results between each one even when assessing different aspects of the root canal preparation. It was concluded that studies that evaluate the same aspect of the preparation may show different results and these are associated with variables inherent in each methodology employee. All the methods supplies important information about root canal preparation. However, it is not should be separately considered. In accord to the evaluated aspect a method can supplies the other one and get reliable results. In relation to the aspects of the preparation it was concluded that the Race system showed apical deviation absence, action on all the walls, displacement to the external curvature walls and vestibular, magnifying of the area, regular surfaces, irregular format and small amount of residues inside the root canal. / Doutor

Indiana University-Purdue University Indianapolis (IUPUI) / Introduction: During root canal treatment (RCT), an opening is made through the crown of the tooth to access and to disinfect the root canal system (RCS). Traditional endodontic access (TEA) may sacrifice tooth structure and weaken the tooth. Cone beam computed tomography (CBCT) provides information about the exact location of the root canals. This information can be used for the design of a canal-directed endodontic access (CDEA). It may also be used for the 3D printing of an acrylic endodontic stent that could help to create a conservative CDEA. Objective: 1) Evaluate the ability of the Dolphin 3D imaging software to assist in creating a CDEA; 2) Compare tooth structure loss in a CDEA to that in a TEA by measuring the volume of remaining tooth structure, surface area of the access opening at the occlusal, and remaining dentin thickness at the CEJ. Materials and Methods: Thirty extracted human mandibular premolars were used. Teeth with large, wide canals were excluded. CBCT images will be taken for all teeth using Kodak 9000. Fifteen teeth were randomly assigned to the TEA group and 15 teeth were assigned to the CDEA group. The CDEA path was mapped using Dolphin 3D imaging software. Acrylic access stents were designed using Rhino 3D software and printed using a 3D printer. The teeth were accessed through the corresponding stents. The 15 teeth that are part of the traditional access group were accessed without a stent. A CBCT scan was taken post-access for all 30 teeth. Wilcoxon Rank Sum Tests were performed to compare the following outcomes for the two groups: the volume of remaining tooth structure, the surface area of the access opening at the occlusal, and remaining dentin thickness at the CEJ. Results: The remaining dentin thickness (percent loss) was not significantly larger for TEA than for CDEA. The surface area (post-treatment) was significantly larger for TEA than for CDEA, and volume (percent loss) was significantly larger for TEA than for CDEA. Conclusion: The use of the CBCT and Dolphin 3D imaging provided an accurate and more conservative CDEA with the guide of an acrylic stent.

Indiana University School of Dentistry located on the campus of Indiana University-Purdue University Indianapolis (IUPUI) / This in-vitro, prospective, randomized study microscopically compared the debridement efficacy of negative pressure irrigation with the EndoVac (Discus Dental, Culver City, CA) versus the Canal CleanMax (Maximum Dental, Inc., Secaucus, NJ). Sixty extracted human canines were instrumented using a combination of hand-instrumentation with Lexicon K-type files and rotary instrumentation with ProTaper files. All canals were irrigated with 6.0-percent sodium hypochlorite and 17- percent ethylenediaminetetraacetic acid (EDTA). However, the irrigation/aspiration techniques differed among three groups of 20 randomly selected teeth. Group one (control) was irrigated with only a 12-ml Monoject syringe via 30-gauge side-vented, closed-end needle. Group two was irrigated with the EndoVac system. Group three was irrigated similar to group one, but with the adjunct of the Canal CleanMax system. All teeth were sectioned longitudinally, and the more intact sections were divided into coronal, middle, and apical thirds. Each portion of the canal was photographed with a scanning electron microscope (SEM). The photographs were scored by two independent examiners according to relative amount of debris and/or smear layer present, as well as relative number of patent dentinal tubules. These scores were statistically analyzed using a Krustal-Wallis test and Wilcoxon Rank Sum tests to determine differences between groups. The coronal aspect of root canal walls irrigated with the EndoVac system exhibited significantly less debris and/or smear layer present when compared to the coronal aspect of root canals irrigated with only a standard 12-ml Monoject syringe equipped with 30-gauge ProRinse side-vented, closed-end needle (control). There were no other significant differences in scores between any groups at any location. For all locations combined, the EndoVac system produced significantly cleaner root canal walls as compared to the control. No significant differences were seen between the Canal CleanMax and Control or Canal CleanMax and EndoVac. This study suggested negative pressure irrigation delivery with the EndoVac system during and after hand-rotary instrumentation is more effective in removal of debris and smear layer from the coronal third and combined thirds of root canal walls compared to irrigation with a standard 12-ml Monoject syringe equipped with 30-gauge ProRinse side-vented, closed-end needle.