Oral PresentationsP37 drawings using this method. The authors suggest a recording system using a mobile device and have found it useful in storing and transmitting the drawings.Methods: Based on iPad 4.0, the rhinoplasty record application program (Rhinograph) was developed. The SQLite was used as an internal database, and the program was developed using XCode 4. The authors kept the operation records of 10 patients who had undergone rhinoplasty and confirmed the usefulness and convenience of this system. Results:The program was divided into 6 parts: 1) the operation sheet (operation registration, surgical details, and notations), 2) looking up, modifying, and converting the system to PDF/ JPG files with email transmissions, 3) the template developing system with frequently used techniques, 4) the database backup and conversion to Excel files, 5) registering user emails and signatures, and 6) the description of the applications. The program resulted in equal convenience and accuracy as hand-drawing among the 10 patients. In addition, the mobile device was easily carried in the operating room and outpatient clinics.Conclusions: The rhinoplasty recording system using a mobile device was found to be as effective as the traditional way of recording and helped remove the constraints of place. In addition, it was shown to be convenient to store and analyze the data.
Objective: 1) Determine the flexural modulus (intrinsic flexibility) of tissue-engineered human septal neocartilage constructs using 3 point bending mechanical testing. 2) Compare the flexibility of native human septal cartilage to human tissue-engineered septal cartilage constructs using 3-point bending mechanical testing. Method: Strips of tissue-engineered human septal neocartilage and native septal cartilage were subjected to 3-point bending using a testing apparatus with axial load cell and actuator. Uniform stress was applied while displacement and strain were recorded. The flexural rigidity or bending modulus was calculated for each sample. Results: After 10 weeks in culture, the flexural modulus of tissue-engineered human septal neocartilage constructs was 0.462 N/mm2 versus 3.28 N/mm2 for native tissue ( P = .002). No samples fractured or demonstrated plastic deformation. Conclusion: Tissue-engineered septal neocartilage was 7.1-fold more flexible than native septal cartilage. This study demonstrates that flexural moduli of tissue engineered septal cartilage can be determined after 10 weeks in culture, providing a useful measure of construct properties relative to native tissue.
Objectives: 1) Characterize biochemical and biomechanical properties of New Zealand White rabbit septal cartilage for future utilization in rabbit septal cartilage tissue engineering studies. 2) Determine whether tensile and bending properties vary when measured in different axes. Methods: Nasal septa were harvested from adult New Zealand White rabbits post-mortem. Confined compression testing was performed. Samples cut in the vertical and anterior-posterior (AP) plane were subjected to tensile testing and 3-point bending. Biochemical assays determined the Glycosaminoglycans (GAG), total collagen, and DNA concentrations in each sample. Results: Confined compression demonstrated an average compressive modulus (HAO) of 0.82 (±0.23 MPa). In tensile testing, peak stress of samples cut in the vertical plane (6.61±1.28 MPa) were significantly greater (p=0.02) than in the AP plane (5.22±1.31 MPa). Tensile stiffness at failure strain for vertical (22.90±5.51 MPa) and AP (18.67±9.56 MPa) samples did not differ significantly (p > 0.05). The flexural moduli of samples cut in the vertical plane (39.31±16.6 MPa) and AP plane (39.32±20.24 MPa) were also not significantly different (p > 0.05). Biochemical characterization demonstrated an average concentration of 43.81±8.34 µg GAG, 104.71±21.52 µg total collagen, and 0.23±0.05 µg DNA per mg wet weight. Conclusions: Rabbit septal cartilage is anisotropic; tensile strength was higher in the vertical plane than in the AP plane. Compared with published properties of human septal cartilage, rabbit septal cartilage is mechanically stronger, stiffer, and less flexible. Rabbit septal cartilage has a similar DNA content, with higher GAG and total collagen levels than values published for human septal cartilage.
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