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題 名 | Ultrastructural Changes of the Tooth Root Surface by Nd: YAG Laser Irradiation Followed by Citric Acid and Tetracycline=銣錏鉻雷射合併檸檬酸、四環黴素處理牙根表面所造成之顯微結構變化 |
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作 者 | 鄭景暉; 陳冠伍; 林俊彬; 周宏光; 藍萬烘; | 書刊名 | 臺灣醫學會雜誌 |
卷 期 | 98:4 1999.04[民88.04] |
頁 次 | 頁242-247 |
分類號 | 416.9 |
關鍵詞 | 銣錏鉻雷射; 檸檬酸; 四環黴素; 牙根表面; Citric acid; Neodymium laser; Tooth root surface; Scanning electron microscopy; Tetracycline; Ultrasonic scaling; |
語 文 | 英文(English) |
英文摘要 | The neodymium: yttrium-aluminum-garnet (Nd: YAG) laser has been used for treatment ofdentinal hypersensitivity, eradicating periodontal patitogens, and facilitating calculus removal. However, Nd: YAG laser irradiation exerts potentially harmful effects on the tooth root surface. The purpose of this study was to examine the ultrastructural changes of the tooth root surface caused by Nd: YAG laser irradiation, and to determine whether chemical and mechanical preparations can correct these ultrastructural changes. Eighteen tooth specimens (3 x 3 x 0.5 mm) with healthy root surfaces were prepared and irradiated with an Nd: YAG laser at various power densities. Root surfaces were irradiated at 100 mJ at 20 pulses per second (pps) for 2 seconds followed by the application of citric acid (pH 1.2) or tetracvcline solution (100 mg/mL) for 3 and 53 minutes, respectively, or ultrasonic scaling for 5 strokes of 3 seconds per stroke. As observed with low-vacuum scanning electron microscopy, (Wet-SEM), Nd: YAG laser irradiation at 70 to 100 mJ, 20 pps for 2 seconds caused surface cratering, areas of porosity, pitting, fissures, and lava-like structures in an areal40 to 280 μm in diameter. Irradiation of 50 mJ, 20 pps for 2 seconds, led to onlv mild surface'charring. No evidence of morphologic changes was found when root surfaces were irradiated with the Nd: YAG laser at 20 mJ, 20 pps for 2 seconds or at 50 mJ, 10 pps for 8 seconds. The laser-induced lava-like structures were partially detached by citric acid (pH 1.2) etching and ultrasonic scaling, but not by tetracycline (100 mg/mL). These results indicate that chemical and mechanical preparations can be used effectively in conjunction with Nd: YAG laser irradiation for root surface preparation during both nonsurgical and surgical periodontal treatments. |
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