שבר בתותבת אקרילית שלמה הינו אירוע שכיח .
מקובל לחזק את התותבת עם חלק מתכתי (בצד הלינגואלי).
נעשתה בדיקה של 4 סוגי חומרים שונים המחזקים את התותבת .
עצם המצאות החיזוק תרמה לעליה בחוזק של כ25% כאשר המוט היה בעובי 1.2 ממ.
מבין החומרים השונים לא נמצא הבדל משמעותי:קרום-קובלט,פלדת אלחלד,טיטניום,סיבי זכוכית ארוגים.
Journal of Prosthodontics
Volume 14 Issue 1 Page 12 – March 2005
doi:10.1111/j.1532-849X.2005.00006.x
Basic Science Research
Hiroyuki Minami, DDS, PhD1; Shiro Suzuki, DDS, PhD2; Hisanori Kurashige, DDS3; Yoshito Minesaki, DDS, PhD4; and Takuo Tanaka, DDS, PhD5
Purpose: Fracture of an acrylic denture base is a common problem in prosthodontic practice. Although various reinforcement methods have been used, when a fractured denture base is repaired with autopolymerizing resin recurrent fractures frequently occur at the repairing interface or adjacent areas.
The purpose of this study was to evaluate the maximum flexural load of denture base resin repaired with autopolymerizing resin and several reinforcement systems after thermocycle stressing.
Materials and Methods: Rectangular (10 70 3 mm) flexural specimens were fabricated by repairing a pair of heat-cured denture base resin specimens using autopolymerizing resin and a series of reinforcement materials.
The materials included 4 metal wires and a woven glass fiber.
Each reinforcement was embedded in the center of the specimens.
Flexural specimens repaired without reinforcement were prepared as controls. Specimens were subjected to 50,000 thermocycles (4 60°C, 1-minute dwell time).
A 3-point flexural test was carried out by loading the center of the repaired site at 5 mm/minute crosshead speed with 50 mm span jig supports.
The load necessary to cause fracture was recorded for each specimen.
All data were statistically analyzed using ANOVA and the Bonferroni/Dunn test ( < 0.05).
Results: The average load to fracture of specimens repaired with nonreinforced autopolymerizing resin was 68.4 N after 50,000 thermocycles.
Specimens reinforced with 1.2 mm diameter stainless steel wire exhibited the highest value (89.8 N). The value for specimens reinforced with 1.2 mm diameter Co Cr Ni wire was 86.6 N.
These fracture loads were significantly higher than those for specimens without reinforcement (p< 0.05). Low elasticity reinforcement, such as pure titanium wires, woven metal wire, and woven glass fiber were not effective in increasing the load to fracture values of flexural specimens.
Conclusions: Specimens reinforced with 1.2 mm diameter stainless steel wires or Co Cr Ni wires resulted in significantly higher loads to fracture as compared to specimens without reinforcement. The use of pure titanium wire, woven metal wire, and woven glass fiber did not improve the fracture loads.
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