Behavior of human periodontal ligament cells on CO laser irradiated dentinal root surfaces: an in vitro study.

摘要

Pant V, Dixit J, Agrawal AK, Seth PK, Pant AB. Behavior of human periodontal ligament cells on CO(2) laser irradiated dentinal root surfaces: an in vitro study. J Periodont Res 2004; doi: 10.1111/j.1600-0765.2004.00751.x(c)Blackwell Munksgaard 2004Objective: The aim of this study was to investigate the in vitro attachment behavior of human periodontal ligament fibroblasts on periodontally involved root surface after conditioning with CO(2) laser and to compare its efficacy with chemical conditioning agents, namely tetracycline hydrochloride, citric acid, hydrogen peroxide (H(2)O(2)) and EDTA, using scanning electron microscopy. Methods: A total of 84 scaled and root-planed specimens from periodontally involved single-rooted human teeth showing hopeless prognosis were selected and assigned to two groups. One group was lased with a CO(2) laser (from 5 cm at 3 W for 0.8, 1.0 and 1.2 s), and the other group was treated with either tetracycline hydrochloride (2.5%), citric acid (saturated solution, pH 1), H(2)O(2) (6%) or EDTA (5%; pH 7.4) for 3 min. The specimens were then seeded with human periodontal ligament fibroblasts, incubated for either 12 h or 24 h, and then the cell attachment behavior was observed. Results: CO(2) laser irradiation for 1.0 s was found to be the most efficient, showing consistently good cell attachment with the highest mean value (15.00 +/- 3.41 cells/10,000 microm(2) after incubation for 12 h and 29.17 +/- 2.04 cells/10,000 microm(2) after 24 h), followed by irradiation for 0.8 s (13.11 +/- 3.04 cells/10,000 microm(2) after incubation for 12 h and 22.91 +/- 7.10 cells/10,000 microm(2) after 24 h). Charring was observed following irradiation for 1.2 s. Amongst chemical conditioning agents, citric acid was found to be the most efficient, with a mean cell attachment of 17.82 +/- 2.16 cells/10,000 microm(2) after incubation for 12 h and 23.62 +/- 1.94 cells/10,000 microm(2) after 24 h. EDTA and H(2)O(2) did not do well in the study. Conclusion: The results suggest that CO(2) laser irradiation for 1.0 s may promote comparatively better attachment of periodontal ligament fibroblast on dentinal root surfaces than the conventional chemical conditioning agents used in the study.