• 作者： 黃桂芬; 郭敏光
• 作者服務機構： 國立臺灣附屬醫院牙科部; 國立臺灣大學醫學院牙醫學系
• 中文摘要： 　　氟素電離透析法較一般塗氟法更能提供持久的牙齒去敏感效果。本實驗的目的藉掃描電子顯微鏡，評估氟素電離透
  析法對牙本質小管之影響。牙齒主要分為對照組，氟素處理但未實施電離透析法，及並用氟素電離透析法三組，利用3
  M公司之電離機實施氟素電離透析。實驗後所有牙齒均置於掃描電子顯微鏡下觀察。結果顯示，氟素可造成牙本質小管
  中產生沉澱顆粒，減少小管之直徑。氟素電離透析法更能造成牙本質小管的阻塞。在一定電流量與電壓下沉澱顆粒的大
  小疏密及沉澱穿透距離，和電離透析所使用的通電時間及處理頻率有關。5分鐘無電離透析法產生的沉澱顆粒小而疏，
  平均穿透距離僅達75μm。氟素電離透析法5分鐘一次，沉澱顆粒距離平均可達250μm。電離透析5分鐘三次者沉澱顆
  粒距離平均深達830μm。因此氟素電離透析法較能在牙本質小管內造成較大之沉澱顆粒，且穿透較深。由本研究建議反
  覆實施氟素電離透析法，應可增進牙齒去敏感之效果。
• 英文摘要： Fluoride(F) iontophoresis is preferred over topical application to provide long lasting dentin desensiti-zation. The purpose of this study was to evaluate the changes in dentinal tubules following fluoride ionto-phoresis under SEM observation. Teeth were divided mainly into 3 groups: controls, NaF treated teethwith iontophoresis and those without inotophoresis. A battery operated device was used to apply electriccurrent to teeth. All the teeth were prepared for scanning electron microscopy after treatments. Fluoridetreatment, either non-iontophoretic or iontophoretic, produced granular precipitation in dentinal tubulesand reduced tubular diameter. In 5-minute non-iontophoretic NaF treated teeth, the depth of precipitatepenetration was 75 m on average where the granules were small and sparse. In the 5-minute iontophoreticNaF treated teeth, the average penetration of precipitation reached 250 m in one application whereas inthree applications to teeth the average depth of penetration reached 830 m. Fluoride iontophoresis resultedin obstruction of dentinal tubules. Both the frequency and duration od treatment under constant currentand voltage affected the size of particles, the form of precipitation and the depth of penetration. Largerparticle size and deeper fluoride penetration were observed in iontophoresis treated teeth compared tonon- iontophoresis treated teeth. Therefore, repeated fluoride iontophoresis treatment is suggested to ensurelong lasting densensitization effects.
• 中文關鍵字： dentin desensitization; fluoride iontophoresis; tubular occlusion; scanning electron microscopy.
• 英文關鍵字： --