| 摘要: | 近年來，廠商紛紛推出各種不同光固化裝置來符合臨床上的需求，希望得到最有效率的光固化裝置，可以快速地完成樹脂的填補，並且得到機械、物理性質更好且聚合程度更高的複合樹脂。
本實驗之研究目的是探討鹵素燈光固化裝置(Ultra-Lite 5 Turbo)、電漿燈光固化裝置(Q-LUXPLASMA 100) 及發光二極體光固化裝置(3M ESPE Elipar Freelight) 等三種光固化裝置分別使用(1)持續固定是(2)漸進式兩種不同光固化模式，在固化複合樹脂Z250 (3M ESPE)時，對於複合樹脂的固化深度及伸縮間隙的影響，並評估其用於照射剩餘牙本質厚度分別為1mm及2mm時牙本質牙髓交介面溫度之變化。
實驗分成三部分(1)使用外直徑18mm、內直徑6mm、厚度1mm的鐵氟龍模型共7片，用各個光固化裝置照射後，放入37℃水浴槽中24小時以後，用硬度測試機(Barcol Hardness Tester, Barber-Colman Company, USA)測試各層的硬度來確定固化深度；(2)使用外直徑18mm、內直徑6mm、厚度4mm的鐵氟龍模型，用各個光固化裝置照射後，放入37℃水浴槽中24小時後，用電子微測儀(Mitutoyo, Japan) 測量複合樹脂經過光固化作用後尺寸變化所產生的收縮間隙；(3)在牙本質牙髓交界面埋設感溫電偶(Thermocouple)，用以感測溫度之變化，照射處剩餘牙本質厚度分別為1mm及2mm。所得之數據以Two-way ANOVA 及 Tukey test 比較用不同的光固化裝置和不同的光固化模式分別對複合樹脂之固化深度，收縮間隙和溫度變化有何影響。
無論哪一種光固化裝置及模式，各組都可達到4mm之固化深度。無論是那一種光固化模式，電漿燈光固化裝置使複合樹脂所產生之收縮間隙比鹵素燈或發光二極體光固化裝置顯著來得大(p<0.05)，而且無論那一種光固化裝置，漸進式都比持續固定式光固化模式之收縮間隙小(p<0.05)。各組在剩餘牙本質厚度1mm以上時，對於牙本質牙髓交界面所造成之上升溫度皆未超過5.5℃。
Recently, the factories promote various kinds of light curing devices to fit the clinical demands, and hope to get the most effective light-curing device which can cure composite resin rapidly and obtain the restorations with better mechanical and physical properties and polymerization.
The objective of this study was to assess the depth of cure and contraction gap of a composite resin (Filtek Z250) exposed to three different types of light-curing devices (Ultra-Lite 5 Turbo-QTH, Q-LUXPLASMA 100-PAC, and 3M ESPE Elipar Freelight- LED) and two light curing modes (the continuous constant curing and the ramp curing). Also assess the thermal changes at the dentin-pulpal interface while exposed to the dentin surface with 1mm and 2mm in thickness.
The study was divided into three parts: (1) prepare 7films of Telfon mold with 18mm-outer caliber, 6mm-inner caliber, and 1mm thickness. Composite resins were exposed to every light curing system, and then put into 37 ℃waterbath until 24 hours. Thereafter, measure the hardness of each film with Barcol Hardness Tester (Barber-Colman Company, USA) to assure the depth of cure. (2) prepare Telfon mold with 18mm-outer caliber, 6mm-inner caliber, and 4mm thickness. Composite resins were exposed to every light curing system, and then put into 37℃ waterbath until 24hours. Thereafter, measure the contraction gap resulted in the dimensional change of composite resin after exposed with digimatic caliper (Mitutoyo, Japan).(3)thermal changes were detected at the dentin-pulpal interface by using a thermocouple while exposed to the dentin surface with 1mm and 2mm in thickness.
The effect of the light-curing lamps and molds on depth of cure, contraction gap and thermal change of composite resin was compared with Two-way analysis of variance (ANOVA) followed by Tukey post hoc tests.
In our study, (1) no matter what kinds of light-curing devices and molds, all system can reach 4mm of depth of cure.
(2) Significantly higher(p<0.05) contraction gap was provided by plasma arc lamp regardless of any kind of light-curing mode.
(3) no matter what kinds of light-curing devices, ramp curing mode is significantly lower contraction gap than continuous constant curing mode.(4) all system never caused temperature rises exceed 5.5℃ when exposed to dentin surface thickness above 1mm. |
