Evaluation of the Mechanical Strength Properties of a Bioresorbable Osteosynthesis System Bent in a Staircase Pattern: Comparison of PLLA and Titanium Osteosynthesis Systems:Comparison of PLLA and Titanium Osteosynthesis Systems
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The aim of this study was to evaluate the mechanical strength properties of a poly-L-lactide (PLLA) bioresorbable osteosynthesis system (Neofix<SUP>®</SUP>) that was bent in a staircase pattern and to compare the mechanical strength of this system with the mechanical strengths of conventional titanium osteosynthesis systems (Modus<SUP>®</SUP> 1.5 and Modus<SUP>®</SUP> 2.0) that were bent in the same way.<BR>A straight 4-hole plate of Neofix<SUP>®</SUP> was bent in a staircase pattern with step height of 5mm using a heated bender and fixed to artificial bones with 8-mmlong screws. Straight 4-hole titanium plates were bent in the same pattern and fixed to artificial bones with 8-mmlong screws. Plate thicknesses of Modus<SUP>®</SUP> 1.5 and Modus<SUP>®</SUP> 2.0 were 0.6mm and 1.0mm, respectively. Artificial bones were mounted in a mechanical testing machine (Autograph, Shimadzu Corporation) and forces were applied at a rate of 2mm/min to determine tensile strengths, bending strengths and shear strengths. Eachtest was repeated three times, and critical forces and patterns of hardware failure were recorded.<BR>Mean tensile strength of Neofix<SUP>®</SUP> was 19.1±2.0 kgf, which was about half the value of Modus<SUP>®</SUP> 1.5 (38.2±0.6 kgf). Mean bending strength of Neofix<SUP>®</SUP>, which was bent more than 45 degrees, was 1.56±0.08kgf, which was slightly higher than that (1.39±0.11kgf) of Modus<SUP>®</SUP> 1.5 and 43% of that (3.63±0.24kgf) of Modus<SUP>®</SUP> 2.0. Mean shear strength of Neofix<SUP>®</SUP> was 19.9±0.8kgf, which was 38% of that (52.8±1.5kgf) of Modus<SUP>®</SUP> 1.5 and 14% of that (142.0±3.8kgf) of Modus<SUP>®</SUP> 2.0.<BR>Neofix<SUP>®</SUP> bent in a staircase pattern showed lower tensile strength and lower shear strength than those of the two types of titanium plates bent in the same way, although the bending strength of Neofix<SUP>®</SUP> was similar to that of the titanium plates.
- 特定非営利活動法人 日本顎変形症学会の論文
特定非営利活動法人 日本顎変形症学会 | 論文
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