The thermomechanical properties of gutta-percha. Part IV. A thermal profile of the warm gutta-percha packing procedure.

By Goodman A, Schilder H, Aldrich W

Date: 01/1982
Journal: Oral Surg Oral Med Oral Pathol

Summary:  ​

Purpose:  demonstrate crystalline phase transformations in the gutta-percha material and to determine at what points in the thermal cycle they take place. ​

N= 8 single-rooted human teeth ​

Materials/Methods:  ​

  • Teeth were prepared for the warm gutta-percha packing procedure by cleaning and shaping the root canals with serial reaming and filing. teeth were then sectioned longitudinally. ​
  • In a single half of each specimen, channels were bored through the dentin from the internal pulpal wall to the external surface of the root for thermocouple . The two halves of each specimen were then cemented back together.​
  • Endodontists were asked to fit a master GP cone, evaluate it radiographically and pack it while being monitored. ​  ​

Most highlighted Results:

  1. There was variations in thermal patterns resulted from individual differences in timing and instrumentation. Certain clinically accepted patterns of activity produced consistent, representative temperature ranges to which the gutta-percha was subjected. ​
  2. The representative maximum regional temperature to which bulk gutta-percha is subjected in the body of the canal during the warm gutta-percha packing procedure is 80o C. ​
  3. Maximal temperature range to which gutta- percha is elevated in the apical region is 40o to 42o C.​
  4. Thermal penetration of gutta-percha is limited during the packing procedure, with significant thermal effects rarely exhibited more than 4 to 6 mm into the material from the point of entry of the heat source, or more than 2 to 3 mm. from the point of deepest penetration. ​

Clinical significance:​

Clinically relevant to any warm GP obturation technique.​