In vitro study of root fracture treated by CO2 laser and DP-bioactive glass paste

Yin Lin Wang, Bor Shiunn Lee, Ching Li Tseng, Feng Huei Lin, Chun Pin Lin

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Background/Purpose: An ideal material has yet to be discovered that can successfully treat vertical root fracture. Therefore, the purpose of this study was to use a continuous-wave CO2 laser of medium-energy density to fuse DP-bioactive glass paste (DPGP) to vertical root fracture. Methods: The DP-bioglass powder was based on a Na2O-CaO-SiO2-P2O5 system and it was mixed with phosphoric acid (65% concentration) with a powder/ liquid ratio of 2 g/4 mL to form DPGP. The interaction of DPGP and dentin was analyzed by means of X-ray diffractometer (XRD) and differential thermal analysis/thermogravimetric analysis (DTA/TGA). Root fracture line was filled with DPGP followed by CO2 laser irradiation and the result was examined by scanning electron microscopy (SEM). Results: The main crystal phase of DPGP was monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O) and the phase transformed to dicalcium phosphate dihydrate (CaHPO4·2H2O) after mixing DPGP with dentin powder (DPG-D). Additionally, γ-Ca2P2O7 and β-Ca2P2O7 were identified when DPG-D was lased by CO2 laser. The reaction temperature was between 500°C and 1100°C. SEM results demonstrated that the fracture line was effectively sealed by DPGP. Conclusion: The chemical reaction of DPGP and dentin indicated that DPGP combined with CO2 laser is a potential regimen for the treatment of vertical root fracture.

Original languageEnglish
Pages (from-to)46-53
Number of pages8
JournalJournal of the Formosan Medical Association
Issue number1
Publication statusPublished - Jan 2008
Externally publishedYes


  • CO
  • DP-bioactive glass paste
  • Laser
  • Vertical root fracture

ASJC Scopus subject areas

  • Medicine(all)


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