Mechanical Strength of Synthetic Casting Tape for Application to Fracture Treatment of Farm Animals

S. Hara; Y. Kawamoto; S. Nuta; N. Tomizawa

doi:10.1055/s-0038-1632507

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 1996; 09(02): 79-83
DOI: 10.1055/s-0038-1632507

Original Research

Schattauer GmbH

Mechanical Strength of Synthetic Casting Tape for Application to Fracture Treatment of Farm Animals

Authors

S. Hara

¹From the Department of Veterinary Surgery, Faculty of Agriculture, Iwate University, Morioka, Japan
Y. Kawamoto

²Research and Department Laboratory, Sagamihara, Japan
S. Nuta

¹From the Department of Veterinary Surgery, Faculty of Agriculture, Iwate University, Morioka, Japan
N. Tomizawa

¹From the Department of Veterinary Surgery, Faculty of Agriculture, Iwate University, Morioka, Japan

Abstract

Summary

Compressive and torsional strength of cyclindrically formed synthetic casting tape for animals (Vetcast Plus™), composed of polyurethane-impregnated glass fibres, was investigated to determine its adequate application to fracture treatment of farm animals. After the completion of curing reaction, six-layered samples of the synthetic casting tape tolerated a compressive load of 6630 N (680 kgf). The sixlayered casting tape had also a torsional strength of 64 N · m. The compressive strength increased with time after the initiation of curing reaction. The time required for practical curing (achieving more than 60% of a final strength) was only 30 min, and that for complete curing 120 min. It was demonstrated that efficacious and safe fracture treatment of farm animals could be carried out using the synthetic casting tape for animals when a layer number appropriate to the total body weight of the patient animal was employed. The information obtained in this study is thought to be very useful in clinical practice.

Mechanical strength of poly-urethane-impregnated synthetic casting tape was investigated to determine its adequate application to fracture treatment of farm animals. It was demonstrated that mechanical strength of cylindrically formed samples of the casting tape depended upon the layer number, and the six-layered sample tolerated a compressive load of 6630 N and a torsional load of 64 N · m when completely cured.

Keywords

Compressive strength - torsional strength - synthetic casting tape - plaster of paris bandage - farm animals

Full Text

References

REFERENCES
1 Dorkery GL, Diana JL, Dice DR. A new thermoplastic casting system. J Am Podatry Assoc 1978; 68: 198-200.
2 Fleming LL, Miller K, Sinback M. Clinical experience with a new casting tape. South Med J 1980; 73: 569-71.
3 Davie B, Dooly B. New fiberglass casting system in orthopedic practice. Med J Aust 1976; 1: 1010-2.
4 Dockery GL, Tozzi MA, Spencer AM. A fiberglass casting material for use in podiatry. J Am Podiatry Assoc 1976; 67: 436-40.
5 Velazco A, Pierrer RST, Fleming LL. Clinical experience with a water activated fiberglass casting material. Orthopedics 1983; 5: 1186-91.
6 Houlton JEF, Brearley MJ. A comparison of some casting materials. Vet Rec 1985; 117: 55-8.
7 Ferguson JG. Traum and critical care of the large animal patient. In: Veterinary Trauma and Critical Care. Zaslow IM. ed Philadelphia: Lea & Febiger; 1984: 443-6.
8 ST-Jean G, Clem MF, DeBowes RM. Transfixation pinning and casting of tibial fractures in calves: Five cases (1985–1989). J Am Vet Med Assoc 1991; 198: 139-43.
9 Wilson DG, Vanderby R. An evaluation of six synthetic casting materials: Strength of cylinders in bending. Vet Surg 1995; 24: 55-9.
10 3M Data. “Technical Bulletin of Vetcast (Veterinary Casting Tape), Comparative study of Commonly Used Cast Materials”, 1981.
11 Shames IH. Torsion of thin-walled, noncircular shatts. In: Introduction to solid mechanics. 2nd Ed. Chapter 14 “Torsion”, Prentice-Hall, Inc. New Jersey, U.S.A; Englewood Cliffs: 1989: 441-6.
12 Bartel DL, Schryver HF, Lowe JE, Parker RA. Locomotion in the horse: A procedure for computing the internal forces in digit. Am J Vet Res 1978; 39: 1721-7.