- 作者: 石淦生
- 作者服務機構: 國防醫學院牙醫學系; 三軍總醫院牙科部
- 中文摘要: 影響根柱固位能力的因素包括根柱之形狀、長度、直徑、表面形態、黏著劑、精確適合度和材質等,其中以根柱形狀與表面形態最為重要。近年來金屬蝕刻技術的發展,改進了賤金屬與複合樹脂黏著劑之間的結合力,因此若以蝕刻技術來處理根柱表面則可大幅加增其固位力和防滲性。由於過去的研究忽略了黏著劑與牙本質之間的結合,以致無法測出根柱表面形態或黏著劑厚度對黏著性平行根柱固位能力之真正影響。本實驗用1.5mm和1.75mm管徑之塑膠透明圓柱來取代有解剖差異的自然牙齒,並在大部分樣本管壁上設置環狀水平溝以加增管壁與黏著劑之間的固位能力。實驗取賤金屬(Rexillium III)鑄造1.5mm直徑的平行根柱(parapost system)140個,同時將它們分成7組,分別以光滑、50mμ噴砂、電解蝕刻、化學蝕刻或加鋸齒等來處理根柱表面,藉著複合樹脂黏著劑固定在管道中,之後再將其浸潤於37℃水浴中7天,然後用Instron crosshead speed 1mm/min作拉力測試,所得資料以ANOVA統計方法分析。實驗結果顯示影響黏著性水平根柱固位力最大的是管壁上環狀水平溝的設置,其次是根柱的表面形態,最後是複合樹脂黏著劑的厚度。在不同的根柱表面形態中,鋸齒根柱的固位力最強,其次為蝕刻根柱,光滑或噴砂處理根柱的固位力最弱。換言之,根柱與管壁表面的凹凸深度和黏著劑的強度對黏著性平行根柱的固位力有很大的影響。
- 英文摘要: Factors which have effect on the retention of any dowel include the shape, length, diameter, andsurface configuration of the dowel, the cementing medium, precision fitness and material, etc. The shapeand surface configuration are the most important among all factors. Recent developments of the etchingtechnique for cast metal has improved the bonding strength between base metal alloys and compositecement which offers a great opportunity for better retention of the dowel if its surface has been etched.In the past, because it has often been ignored that the bonding at the cement-dentin interface is weakerthan that between the metal and cement, the true impact of surface configuration and cement thicknesson the retention of dowels has never really been observed. In this study, plastic transparent rods weresubstituted for natural teeth to avoid anatomical variation and circular horizontal grooves were placed onthe channel walls to strengthen the retention between the cement and the plastic rods. A total of 140dowel samples were cast in Rexillium III and were divided into seven groups. The surfaces of the sampleswere treated differently by smoothing, sandblasting, chemical etching, electrolytic etching and serrating,and fixed into the channels of the plastic rods by cementation with composite resin. Immediately there-after, the samples were submerged in 37℃ water for 7 days. instron crosshead speed 1mm/min was used inmeasuring the tensile forces required for extracting the dowels from the channels. Data were analyzedwith the ANOVA method. Among the three factors known to have an effect on the retentionbeing considered in this study, the circular horizontal groove proved to be the most influential, and surfaceconfiguration came next, while cement thickness was the least influential. Among the different surfaceconfigurations, the serrated dowels showed the best retention and were followed in order by etched andsmooth or sandblasted dowels.
- 中文關鍵字: dowel; surface configuration; composite cement; cement thickness; circular horizontal groove
- 英文關鍵字: --