gum elastic การใช้

In 1819, Delabarre introduced the wire crib, which marked the birth of contemporary orthodontics, and gum elastics were first employed by Maynard in 1843.
The Eschmann tracheal tube introducer ( often incorrectly referred to as a " gum elastic bougie " ) is specialized type of stylet used to facilitate difficult intubation.
Until that time the material was known as " gum elastic " or by its Native American name ( via French ) " caoutchouc ".
The material of Venn's design was different from that of a gum elastic bougie in that it had two layers : a core of tube woven from polyester threads and an outer resin layer.
Other differences were the length ( the new introducer was, which is much longer than the gum elastic bougie ) and the presence of a 35?curved tip that let it be steered around obstacles.