以纖維或不銹鋼線強化前牙壓克力樹酯暫用固定局部義齒之折斷負荷

Fracture Load of Anterior Acrylic Resin Provisional Fixed Partial Denture Reinforced with Fiber or Stainless Steel Wire

10.7059/TJOMS.200808.0161

吳育琦(Yu-Chi Wu)；王震乾(Jen-Chyan Wang)；洪純正(Chun-Cheng Hung)；楊奕馨(Yi-Shing Yang)

暫用固定局部義齒 ； 纖維 ； 壓克力樹脂 ； Provisional fixed partial denture ； Fiber ； Acrylic resin

Taiwan Journal of Oral Medicine Sciences

24卷2期（2008 / 08 / 01）

161 - 172

繁體中文

Fracture of acrylic provisional restorations is a common clinical problem. The functional and esthetic demands of anterior provisional fixed partial dentures (FPDs) are essential. The purpose of this study was to measure the fracture load of anterior acrylic resin provisional FPD5 reinforced with fibers or stainless steel wire, and to evaluate the effect of different types and lengths of reinforcements on fracture load and fracture patterns of samples. A total of 70 standardized 4-unit bridges over the maxillary anterior region were fabricated with PMMA resin. These were then divided into 7 equal groups (n=10); un-reinforced samples formed the control group. The experiment samples were reinforced with different length (4, 15mm) of three types of reinforcements (stainless steel wire, FibreKor, Consruct). All samples were subjected to thermocycling (600×5~55℃, 1mm dwell time), following which the load was applied to samples using a universal testing machine until initial fracture. The fracture load and fracture pattern were recorded and the fracture surfaces of selective samples were observed under SEM. The results revealed that the group reinforced with 15mm stainless steel wire showed the highest fracture load 16.98±3.45kg and the control group exhibited the lowest value 10.31±2.37kg. Statistical analysis by two-way ANDVA analysis of variance showed that the type and length of the reinforced material significantly influence fracture load p＜.0001) and fracture pattern (p＜.0001). We conclude that samples reinforced with 15mm stainless steel wire result in a significantly higher fracture load as compared with samples reinforced with fibers. The use of 15mm stainless steel wire and fibers can change the mode of fractures of samples from catastrophic or flexural fractures to partial ones that easily repaired.

Fracture of acrylic provisional restorations is a common clinical problem. The functional and esthetic demands of anterior provisional fixed partial dentures (FPDs) are essential. The purpose of this study was to measure the fracture load of anterior acrylic resin provisional FPD5 reinforced with fibers or stainless steel wire, and to evaluate the effect of different types and lengths of reinforcements on fracture load and fracture patterns of samples. A total of 70 standardized 4-unit bridges over the maxillary anterior region were fabricated with PMMA resin. These were then divided into 7 equal groups (n=10); un-reinforced samples formed the control group. The experiment samples were reinforced with different length (4, 15mm) of three types of reinforcements (stainless steel wire, FibreKor, Consruct). All samples were subjected to thermocycling (600×5~55℃, 1mm dwell time), following which the load was applied to samples using a universal testing machine until initial fracture. The fracture load and fracture pattern were recorded and the fracture surfaces of selective samples were observed under SEM. The results revealed that the group reinforced with 15mm stainless steel wire showed the highest fracture load 16.98±3.45kg and the control group exhibited the lowest value 10.31±2.37kg. Statistical analysis by two-way ANDVA analysis of variance showed that the type and length of the reinforced material significantly influence fracture load p＜.0001) and fracture pattern (p＜.0001). We conclude that samples reinforced with 15mm stainless steel wire result in a significantly higher fracture load as compared with samples reinforced with fibers. The use of 15mm stainless steel wire and fibers can change the mode of fractures of samples from catastrophic or flexural fractures to partial ones that easily repaired.