The investigation of composition and thermal behavior of two types of backfilling gutta-percha

Pai Chun Huang, Yi Ting Wu, Yung Hao Hsu, Szu Chin Liao, Ya Hsuan Wang, James L. Gutmann, Haw Ming Huang, Sung Chih Hsieh

Research output: Contribution to journalArticlepeer-review


Background/purpose: In the warm gutta-percha technique, soft-type and regular-type gutta-percha are using for backfilling thermoplasticized injection system. However, there are limited reports about the properties of these backfilling gutta-percha. This study aimed to analyze and compare the composition, thermal behavior and compact force of two types of backfilling gutta-percha. Materials and methods: Soft-type and regular-type backfilling gutta-percha (B&L BioTech, Fairfax, VA, USA) were investigated. The inorganic and organic fractions of these gutta-perchas were separated by quantitative chemical analysis (n = 6). Their composition was analyzed using energy dispersive spectroscopy. Thermal behavior in response to temperature variations was analyzed using differential scanning calorimetry. Additionally, a compaction model was used to investigate the relation between compaction force and temperature (n = 10). Results: The soft-type contained more gutta-percha (3.69–5.85%), carbon ratio (38.96–48.52%) and less inorganic substance (86.51–90.45%), zinc ratio (29.36–35.67%). The composition ratio of two types gutta-percha were statistically significant different (P < 0.05). There were three phase transitions of the soft-type gutta-percha which started at 39.84 °C, 49.32 °C and 54.15 °C while the two phase transitions of the regular-type gutta-percha started at 40.48 °C and 53.45 °C. The glass transition temperature of the regular-type gutta-percha (44.24 °C) was higher than that of the soft-type gutta-percha (40.66 °C). Under various setting temperature, the higher compaction force in the regular-type gutta-percha was required (P < 0.05). Conclusion: The different components in gutta-percha contribute to its differences in thermal behavior. The soft-type had a higher proportion of gutta-percha and lower ZnO which makes the fluidity better than the regular-type.

Original languageEnglish
Pages (from-to)414-419
Number of pages6
JournalJournal of Dental Sciences
Issue number1
Publication statusPublished - Jan 2023


  • Backfilling
  • Regular-type gutta-percha
  • Soft-type gutta-percha
  • Thermal behavior
  • Warm vertical compaction

ASJC Scopus subject areas

  • General Dentistry


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