運用不同美白時間之發光二極體活化美白藥劑對牙齒美白之效果評估---體外研究

The effect of LED light with different bleaching time to activate bleaching agent on tooth bleaching---an in vitro study

王偉明(Wei-Ming Wang)

指導教授 ： 吳逸民

高雄醫學大學/口腔醫學院/口腔衛生學系碩士在職專班/碩士(2015年)

摘要

研究目的：
探討美白藥劑和LED光利用不同美白時間移除外因性牙齒染色之美白效果影響之體外研究。

材料和方法：
收集100顆人類牙齒並經由咖啡染色一星期20歲以上成人因治療需要而拔除的牙齒。隨機分派成5組，每組20顆牙齒。實驗組A：(6%過氧化氫和美白5分鐘及無光照)，實驗組B：(6%過氧化氫和美白20分鐘及無光照)，實驗組C：(6%過氧化氫和美白及光照5分鐘)，實驗組D：(6%過氧化氫和美白及光照10分鐘)和實驗組E：(6%過氧化氫和美白及光照20分鐘)。美白程序重複2次。所有樣本在染色和美白前後由光譜儀量測色階。所有資料以ANOVA進行牙齒染色前比較分析，再以ANCOVA進行牙齒染色後和美白後色階平均值比較分析。

結果：
各組在牙齒染色前色階平均值由變異數分析，在統計上無顯著差異。各組在牙齒染色後色階平均值由共變數分析，在統計上無顯著差異。各組接受第一次牙齒美白和第二次牙齒美白後，在統計上有顯著差異。以同樣的美白時間5分鐘或20分鐘比較，LED光照後色階改變高於無光照。不同LED光照時間的比較結果，顯示牙齒色階改變以20分鐘光照時間最為顯著。

結論：
實驗結果發現6%過氧化氫經由光源活化比無光源活化對牙齒美白有更大的影響。美白藥劑光照時間以20分鐘的牙齒色階改變為最佳。

關鍵字

牙齒美白 ； 冷光美白 ； 外因性染色 ； 美白藥劑 ； 牙齒色階量測

並列摘要

Objectives：
This in vitro study was to evaluate the effectiveness of bleaching agent and LED light using different bleaching time for the removal of extrinsic tooth stains.

Materials and methods：
Freshly extracted 100 human teeth were stained with coffee solution for 1 week. Each group was divided into 5 sub-group of 20 teeth. Group A: 6% HP/5 min. without LED light activation, Group B: 6%HP/20 min. without LED light activation, Group C: 6%HP/5 min. with LED light activation, Group D: 6% HP/10 min. with LED light activation, Group E: 6% HP/ 20 min. with LED light activation. The bleaching procedure was repeated 2 times. Spectrophotometer measurements of the tooth shades were performed for each specimen before and after staining and bleaching. The data were submitted to one-way ANOVA to compare the values of before staining and ANCOVA to compare the values of after staining and bleaching.

Results：
No significant differences were found before tooth staining by ANOVA. No significant differences were found after tooth staining by ANCOVA. All groups were significant differences in shade change after the first and second bleaching session. LED light activation showed higher shade changes than no light activation both in the 5 min. or 20 min. bleaching time. The most obvious shade changes can be found in the group of 20 min. bleaching time with LED light activation.

Conclusions：
The hydrogen peroxide (6%) via LED light activation has a greater capability for effective tooth bleaching than without LED light activation. The hydrogen peroxide (6%) plus LED light activation could achieve the best tooth shade changes in the 20 min. group.

並列關鍵字

tooth bleaching ； cold light bleaching ； extrinsic discoloration ； bleaching agents ； tooth color measurement

參考文獻

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