A comparative study on the dislodging force of magnetic attachment to the denture resin by magnetic design and fixing materials / 대한치과보철학회지

STATEMENT OF PROBLEM: Detachment of the magnetic assembly from the denture base has been a problem in magnetic overdenture patients. PURPOSE: The objectives of this study were to compare the dislodging force by the fixing materials and the designs of the magnetic assembly, and to compare the effect between the fixing materials and the designs of the magnetic assembly. MATERIAL AND METHODS: Two fixing materials, Jet denture repair acrylic(R) and Super-Bond C&B(R) and two types of magnetic assembly designed with or without wing were used. Each magnetic assembly was fixed in the chamber of the denture base resin block (Lucitone(R)199) with each fixing material respectively. These specimens were thermocycled 2,000 cycles in the water held at 4degrees C and 60degrees C with a dwell time of 1 min each time. Each specimen was seated in a testing jig and then a push-out test was performed with a universal testing machine at a cross head speed of 0.5 mm/min to measure the maximum dislodging forces. RESULTS: Comparing the fixing materials, Super-Bond C&B(R) showed superior dislodging force than Jet denture repair acrylic(R). Comparing the design of the magnetic assemblies, the wing design magnetic assembly showed better dislodging force. Combination of the Super-Bond C&B(R) as a fixing material and wing design magnetic assembly revealed a greatest dislodging force. The kind of fixing material was more influential than the type of magnetic assembly. CONCLUSION: The dislodging force of Super-Bond C&B(R) was significantly higher than Jet denture repair acrylic(R). And the dislodging force of magnetic assembly which have wing design was significantly higher than magnetic assembly which have no wing design.

Development and application of a new orthopedic fixing material / 医学研究生学报

The development of orthopedic fixing materials is a most basic and active aspect in orthopedic injury treatment.Their invention and application of early manual splints,gypsum bangs,hot-shaped splints,polymeric bangs and so on,greatly promoted orthopedic fixing performance and varied the strategies of orthopedic injury treatment.By repeated experiments and clinical trials,we developed a new orthopedic fixing material using polymeric materials.Convenient to operate,easy to remove,auto-shaped,X ray transmittable,water proof and durable,it not only satisfies the needs of fixing different parts of the body,but also remedies the defects of earlier fixing materials,and therefore has gained an extensive application as the best fixing material for the treatment of clinical and battle-field bone fractures.Further studies on it will surely better its properties,reduce its cost and lead it to a wider application.