- 學位論文
高亮度發光二極體對樹脂聚合硬度之影響
Comparison of curing depth of different LED with high power intensity
摘要
光聚合樹脂受到光照設備很大的影響，傳統的鹵素光容易隨著時間而出現輸出衰退，造成monomer聚合不完全，使臨床的應用上受到影響。發光二極體（blue light emitting diode）輸出較穩定，少了鹵素光會衰退的缺點，現今發光二極體已可普遍應用在臨床操作，新一代具高亮度光源的發光二極體更克服了功率不足的缺點，在本研究中利用傳統的鹵素光（3M XL3000，Kerr Optilux 501）與新一代的發光二極體（Litex 695，Ivoclar Bluephase，Densply Smartlite Iq，SDI Radii，Kerr LEDemetron）做比較，在不同的光照時間下（10，20，40秒）聚合充填在不同厚度（2，3，4 mm）的模具中的樹脂，利用Vicker`s hardness來檢定不同光照設備所造成不同硬度的差異，並依據測光表，光譜儀，和感溫器所測得的數值，比較高亮度的光源是否造成高溫，LED光譜分佈與鹵素光是否存在著差異。結果發現，光強度超過700 mW/cm2的高亮度發光二極體已沒有低產熱的優點，除了Litex 695和SDI Radii外，連續光照40秒後溫度已高過傳統的鹵素光。高亮度的光源，突破傳統光照20秒，樹脂有效聚合2 mm深的限制，以Litex 695為例，光照20秒，樹脂有效聚合4 mm深，光照10秒，樹脂有效聚合2mm深。結果顯示，高功率的發光二極體，尤其是光強度超過1200 mW/cm2的燈具，將大大的改變我們臨床的操作模式，改善了層層堆積技術的堆積深度並有效的縮減等待的時間。
並列摘要
Due to the light curing unit’s great impact on the composite resin, the traditional halogen light appears to having an exportation recession with time, and resulting in an incomplete monomer polymerization .And all these may have a black shock on clinic application. The exportation of the LED is more compatible (lacking the defect of halogen light’s recession),and nowadays LED is applied for clinic operation generally. Moreover, a new generation of LED overcomes the deficiency of the intensity. In our study, we try to compare the traditional halogen light(3M XL3000,Kerr Optilux 501) with the new generation(Litex 695,Ivoclar Bluephase,Densply Smartlite Iq, SDI Radii,Kerr LEDmetron).In different lighting time(10,20,40 seconds)use them polymerize the resin clotted in different mode with unique thickness(2,3,4 mm),and test polymerization degree in different LCU under Vicker’s hardness. And then , according to the return of visible curing light meter , spectrometer , thermometer , we try to find if the lighting with high-degree temperature, and if there exists difference between the spectrum of LED and halogen light. Finally, we make the conclusion that LED with high-light loses its advantage of low calefactory. After the continuous 40 seconds lighting, the temperature is over the traditional halogen light(except Litex 695 and SDI Radii).The lighting source with high-light break the limit of resin’s efficient polymerization with 2 mm depth after 20 second’s traditional lighting. Take Lirex695 for example, resin is efficiently polymerized with 4 mm depth after 20 seconds’ lighting, and is efficiently polymerized with 2 mm depth after 10seconds’ lighting.