Plastic and nonmetallic article shaping or treating: processes – Treating shaped or solid article – By a temperature change
Patent
1990-09-26
1992-06-30
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Treating shaped or solid article
By a temperature change
264345, B29C 7102
Patent
active
051260948
ABSTRACT:
A crystalline orthodontic bracket which has been subjected to a machining operation having improved fracture toughness and a heat treatment method for obtaining such improved fracture toughness. The method includes the steps of placing the machined orthodontic bracket in an oven and heating the bracket at an elevated temperature above normal annealing temperatures and slightly below the melting point of the brackets which is capable of healing surface microcracks. The bracket is maintained at this temperature for a predetermined period of time so as to heal microcracks on the surface. The bracket is then removed and allowed to cool to room temperature.
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Farzin-Nia Farrokh
Sterrett Terry L.
Aftergut Karen
Silbaugh Jan H.
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