Thesis (M.S.)--West Virginia University, 2002. / AH26 is a registered trademark. Title from document title page. Document formatted into pages; contains vii, 55 p. : ill. (some col.). Includes a video file in the AVI format. Vita. Includes abstract. Includes bibliographical references (p. 48-53).

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains vii, 38 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 27-30).

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains vii, 47 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 35-38).

Orientador: Léa Assed Bezerra da Silva / Banca: Mario Roberto Leonardo / Banca: Jesus Djalma Pécora / Resumo: Foram utilizados 115 dentes pré molares inferiores de humanos, que foram divididos em 5 grupos de 16 dentes cada; sendo 5 grupos com 5 dentes cada, utilizados como controle positivo e, 5 grupos de 2 dentes como controle negativo. Em todos os dentes após a abertura coronária, foi realizado o desbridamento foraminal com uma lima tipo Kerr no 15 até 1mm além do forame apical e o preparo biomecânico a 1mm aquém comprimento real do dente. Foram utilizados para a instrumentação dos canais radiculares, os sistemas de limas rotatórias de níquel titânio ProFile 0.4/.06 e Quantec, e a técnica Clássica Modificada; sendo o batente apical preparado até a lima 45 de cada técnica de instrumentação. A cada troca de lima, foi utilizado o hipoclorito de sódio à 1% como solução irrigadora. Posteriormente os dentes foram obturados pelos sistemas de guta-percha termoplastificada Thermafil, Microseal e pela técnica da Condensação Lateral Ativa; utilizando como cimento obturador; AH Plus. Após as obturações os dentes foram impermeabilizados com esmalte de unha, exceto, o 1mm ao redor do forame apical; imersos no corante de azul de metileno à 2% sob vácuo e fraturados de maneira a serem obtidas duas hemi-partes. A penetração do corante foi medida com auxílio de um perfilômetro, e os dados, após análise estatística mostraram que, o grupo de dentes instrumentados pelo sistema ProFile 0.4/.06 e obturados com o sistema Thermafil, apresentaram menor infiltração apical, quando comparado com os demais grupos. / Abstract: It was evaluated 115 mandibular premolars of humans, that were divided in 5 groups of 16 teeth each; 5 groups with 5 teeth each, used as positive control and 5 groups of 2 teeth as negative control. After coronary acess, the apical patency was accomplished with a file type Kerr no 15 up to 1mm after the apical foramen and prepared to 1mm short of working length. Instrumentation wasdone, using ProFile 0,04 and 0,06 and Quantec, stotary files and the Modified Classic technique; The apical preparation used a file 45 as memory file. After each file change, sodium hypochlorite was used at 1% as irrigation solution. The teeth were filled using systems of thermoplasticized gutta-percha Thermafil, Microseal and the technique of the Active Lateral Condensation. The sealer used was the AH Plus root canal sealer. After obturation the teeth were waterproof with fingernail enamel, except, the 1mm short of the apical foramen; immerged in the coloring of methylene blue at 2% under vacuum and fractured in a way where it was obtained two hemi-parts. The penetration of the coloring was measured with aid of a Nikon Profile Projector, and the data, after statistical analysis showed that, the group of teeth under the system ProFile 0,04 and 0,06 and filled with the system Thermafil, presented lower leakage apical, when compared with other groups. / Mestre

Indiana University-Purdue University Indianapolis (IUPUI) / Introduction: One of the challenges of non-surgical root canal treatment (NSRCT) is determining the working length of the canal which indicates the exact end point of root canal preparation and obturation. The development of the Electronic Apex Locator (EAL) has helped the clinician to determine the location of the apical foramen, and hence the working length, when performing NSRCT. Objective: The objective of this in vitro study was to determine the accuracy of a new EAL, the E-PEX (Changzhou Eighteeth Medical Technology Co., China), and compare it to a commonly used EAL, the Root ZX II (J. Morita Corp, Kyoto, Japan), for determining the location of the apical foramen. Materials and Methods: Twenty extracted single rooted teeth were used in this study. The crowns were removed and the distance from a coronal reference point to the apical foramen was measured utilizing a k-file and direct visualization under magnification. Teeth were then mounted in alginate and measurements for the apical foramen were made using the Root ZX II and the E-PEX. The difference between the actual canal length and the electronic length was then calculated and compared. Results: The mean true difference was -0.20, and -0.19 for the E-PEX and Root ZX II respectively. The mean absolute difference was 0.28, and 0.26 for the E-PEX and Root ZX II respectively. Paired t-tests done separately for true differences (p = 0.45) and absolute differences (p = 0.21) showed no significant difference among EALs. The percentage of measurements falling within 0.5 mm of the actual canal lengths for each EAL were 95% and 90% for the E-PEX and Root ZX II respectively. McNemar’s test was used to compare between the two test methods for the percentage within 0.5 mm and revealed no significant difference (p = 0.32). Conclusion: The Root ZX II had an average measurement that was slightly closer to the actual length of the canal when compared to the E-PEX, while the E-PEX had a higher percentage of measurement within 0.5 mm of the apical foramen. However, these differences were not statistically significant.

No description available.

Thesis (MMed)--Stellenbosch University, 2014 / ENGLISH ABSTRACT: Background With recent literature indicating certain clavicle shaft fracture types are best treated surgically; there is renewed interest in the anatomy of the clavicle. lntramedullary fixation of clavicle shaft fractures requires an adequate medullary canal to accommodate the fixation device used. This computer tomography anatomical study of the clavicle and its medullary canal describes its general anatomy and determines the suitability of its medullary canal to intramedullary fixation. Description of methods Four hundred and eighteen clavicles in 209 patients were examined using computer tomography imaging. The length and curvatures as well as the height and width of the clavicle and its canal at various pre-determined points were measured. ln addition the start and end of the medullary canal from the sternal and acromial ends of the clavicle were determined. The data was grouped according to age, gender and lateralization. Summary of results The average length of the clavicle was 151.15 mm with the average stemal and acromial curvature being 146 and 133 respectively. The medullary canal starts on average 6.59 mm from the sternal end and ends 19.56 mm from the acromial end with the average height and width of the canal at the middle third being 5.61 mm and 6.63 mm respectively. Conclusion The medullary canal of the clavicle is large enough to accommodate commonly used intramedullary devices in the nraprity of cases. The medullary canal extends far enough medially and laterally for an intramedullary device to adequatet'y bridge most middte third clavicle fractures. An alternative surgical option should be avalable in theatre when treating females as the medullary canal is too small to pass an intranedullary device past the fracture site on rare occasions.

published_or_final_version / Dentistry / Master / Master of Dental Surgery

published_or_final_version / Paediatric Dentistry / Master / Master of Dental Surgery

No description available.