4 research outputs found
Impacted Maxillary Canines - Etiology, Diagnosis, Radiologic and Orthodontic Clinical
No full textCanine maxillary teeth are aesthetically most dominant teeth which can present a smile as either holy or evi. They define the mouth’s corner, are involved in the aesthetic smile, maintain occlusal stability, and design the shape of the dental arch. As the position of the impacted canines is amidst vital anatomical structures like the nasal cavity and sinuses in the maxilla and mental nerve in the mandible, a thorough radiographic evaluation to determine the position of the impacted canines is of utmost importance prior to any treatment planning. By using a radiographic image, a clinician can clearly identify its location. The present paper aimed to determine the prevalence, etiology, and clinical diagnosis of impacted maxillary canines in orthodontic patients. Keywords: Canine impaction, Etiology, Inspection, Palpation, Radiographs, CT, CBCT, Transtomograph
Impacted Maxillary Canines - Etiology, Diagnosis, Radiologic and Orthodontic Clinical
No full textCanine maxillary teeth are aesthetically most dominant teeth which can present a smile as either holy or evi. They define the mouth’s corner, are involved in the aesthetic smile, maintain occlusal stability, and design the shape of the dental arch. As the position of the impacted canines is amidst vital anatomical structures like the nasal cavity and sinuses in the maxilla and mental nerve in the mandible, a thorough radiographic evaluation to determine the position of the impacted canines is of utmost importance prior to any treatment planning. By using a radiographic image, a clinician can clearly identify its location. The present paper aimed to determine the prevalence, etiology, and clinical diagnosis of impacted maxillary canines in orthodontic patients. Keywords: Canine impaction, Etiology, Inspection, Palpation, Radiographs, CT, CBCT, Transtomograph
Risk behaviours associated with hepatitis C infection among persons who inject drugs in Prince George, British Columbia
No full textPersons who inject drugs (PWIDs) are at high-risk of hepatitis C virus (HCV) infection due to blood-to-blood contact when sharing injection equipment (World Health Organization, 2014). To investigate this health concern, the current thesis research obtained the 2008 and 2012 Prince George I-Track survey datasets from the Public Health Agency of Canada (2012). Multivariate logistic regression analyses were conducted to determine risk behaviours and characteristics associated with HCV infection among PWIDs living in Prince George, British Columbia (BC). Two independent variables were significantly associated with HCV infection among Prince George PWIDs: injecting for more than two years, Adjusted Odds Ratio (AOR) 7.87, p < .001, 95% CI [3.60, 17.18], and injecting alone (versus with others), AOR 2.49, p = .004, 95% CI [1.35, 4.59]. The study results provide health practitioners with a highly sensitive (94.1%) predictive tool to identify PWIDs in Prince George, BC who are most likely to be infected with HCV
Flexural behavior of concrete beams prestressed with bonded and unbonded tendons
No full textThe use of unbonded tendons in prestressed concrete beams has been widely utilized in bridges, parking structures, and residential buildings for strengthening, rehabilitation or repair of such members. With the growth of live load and the increase of damaged concrete members, there is a need to develop and utilize new techniques for more efficient and improved designs in prestressed concrete members. This research presents an experimental and analytical investigation for the use of combination of bonded and unbonded tendons in the same concrete members. With the availability of high strength concrete, as well as the development of new prestressing technologies, the process can be easily performed at the site for repair or capacity upgrading resulting in longer spans for the same section depth or shallower sections. There is a knowledge gap on the behavior of concrete beams prestressed with hybrid tendons and a need to fully understand their overall behavior under full service loads. The hybrid technique introduces unbonded CFRP tendons, which is resistant to corrosion. In addition, CFRP tendons exhibit linear stress-strain relationship resulting in more accurate predictions for the tendon stress at ultimate. This hybrid system presents a challenge in developing an analytical model that could predict their behavior since the unbonded tendon is not bonded with the concrete. This investigation included the testing of 15 High Strength Concrete (HSC) beams prestressed with hybrid tendons. Results from the experimental study included number of cracks, load-deflection behavior, and strains in prestressing strand, reinforcing steel, and concrete. This study emphasizes the prediction of the ultimate stress of the unbonded tendon (fps) in unbonded or hybrid system for computing the ultimate moment resistance. Finite element modeling and analysis of various beams is performed. Based on a comparison of equations available in the literature as well as code provisions with the experimental results, a simplified prediction equation for predicting the stress in the unbonded tendons at ultimate is recommended.Ph.D.Includes bibliographical referencesby Adi Abu-Obeida
