The Invention of…. LOW TEMPERATURE THERMOPLASTICS (LTT). The story of Lester Larson and Dorothy Kester. Most Common Uses…. Splints - removable, comfortable casts for almost any part of the body. Foot Orthotics – custom-made shoe inserts to relieve back and knee pain. HISTORY.
LOW TEMPERATURE THERMOPLASTICS (LTT)
The story of Lester Larson and Dorothy Kester
Splints - removable, comfortable casts for almost any part of the body
Foot Orthotics – custom-made shoe inserts to relieve back and knee pain
3000 BC - bark and palm ribs held together with egg whites or clay
860 AD - predecessor to plaster: lime/egg white mixture
Early 19th century - leather and straw treated with wine, acetate, spirits and egg whites - hardened quickly, but cast was very heavy
1835 - lighter-weight, removable bandage made of cardboard and starch - took several days to harden
Plaster of Paris - natural plaster deposits found near Paris, France - plaster powder rubbed into cotton, soaked in water and applied - cast had to be kept dry - very cumbersome
1970’s – fiberglass: light, durable and waterproof, still used today
Invented Low Temperature Thermoplastics (LTT)
Long Search/Little Apparent Progress:
Short process. Aware there was a problem, but no documentation of if there was other experimentation or ideas.
Visit with OT and receives uncomfortable Lucite splint
Seeing the warm, moldable golf ball covers – that could be a splint
Acceptance by the OT community
Supplying the product to Orthopedic Shoe Company in NY
HOW LTT IS USED:
Question 1: What was the metaphor used by Lester Larson?
Question 2: True plastic must meet three conditions. What are they?