| 摘要: | 隨著時代的進步，矯正治療已經愈形普及，接受矯正的患者之年齡層也遍及各階層。在成人的矯正過程中，常會遇到矯正器需要黏著於金屬假牙的情形，而臨床工作上，時常因為黏著強度的不足，而履履遇到矯正器脫落的難題，不但增加患者的不適與不便，也會耗費醫師臨床操作的時間。因此，如何增加矯正器與金屬假牙的黏著強度，便成為一個待解決的問題。
本研究使用SuperBond C&B(4META/MMA-TBB)樹脂做為矯正器的黏著劑，並以兩種臨床上常用的金屬假牙：Au-Pt alloy以及Ni-Cr alloy，進行探討。使用成分為VBATDT的V-primer，實驗分組分為合金假牙的種類、V-primer的使用與否、V-primer的使用方式與水浴的處理與否，共計１０組，並且每組有５個樣本，合計樣本為５０個樣本。每一個樣本均為同樣形狀大小的右下第一大臼齒金屬假牙，矯正器亦選擇右下第一大臼齒金屬矯正器。將矯正器以SuperBond C&B 黏著於金屬假牙後，透過材料試驗機進行黏著強度的測試。矯正器脫落後，量測假牙表面的樹脂殘留量，以PIA影像分析軟體做分析計測，並且以one-way ANOVA以及Bonferroni test進行統計分析。
實驗結果顯示，Ni-Cr alloy假牙與樹脂的黏著強度表現較Au-Pt alloy假牙為優；而V-primer對於Au-Pt alloy假牙與樹脂的黏著有顯著的效果，但使用於Ni-Cr alloy假牙則無差異；V-primer的使用方式，無論是否等待其揮發，其使用上的黏著強度皆無明顯差異；經過水浴後，各組的黏著強度皆有顯著的下降。
V-primer能顯著的提升SuperBond C&B與Au-Pt alloy的黏著強度，但無法抵抗水浴處理後的強度弱化，日後研究可著重於臨床上簡便使用又能有效提供足夠的黏著強度之金屬表面處理方式，便能解決金屬假牙與樹脂不易黏著的困擾。
Introduction
As the quality of life gets better and better, the need of orthodontic treatment is increasing nowadays. In adult orthodontics, we often encountered a problem that the bonding strength of metal bracket and metal crown is not sufficient for clinical use. There are many surface treatment ways to increase the bonding strength of resin cement and metal crown. This study was to find out which factor affect the bonding strength when resin bonding to metal crowns.
Materials and Methods
50 lower right first molar metal crowns were fabricated, half of which were Au-Pt alloy and the other half were Ni-Cr alloy. 25 samples were divided into 5 groups respectively including control (group 1 and 6), after V-primer application we waited for 1 minute for bonding process (group 2 and 7), after V-primer application the bracket immediately bonded with SuperBond C&B(group 3 and 8) , control group with water bath for 24 hours(group 4 and 9), V-primer application and water bath for 24 hours(group 5 and 10).
The bonding strength was measured by JSV H1000 Testing Machine and the crosshead speed was 1mm/min. The bonding strengths and the adhesive remnants percentage were analyzed by one-way ANOVA and Bonferroni test.
Results
The bonding strength was higher in Ni-Cr alloy groups than in Au-Pt alloy groups. When V-primer application was used, the bonding strength increased in Au-Pt alloy groups. However, Ni-Cr alloy groups did not show such increase when V-primer applied on metal crown surface. The bonding strength did not show significant difference whether V-primer was completely dried or not. Significant decrease in bonding strength was shown when the samples were water bathed.
The bonding strengths results were as follows: Group 1, 4.4412±0.5326 MPa; Group 2, 7.2238±0.3378 MPa; Group 3, 6.2990±0.2780 MPa; Group 4, 3.6738±0.1625 MPa; Group 5, 4.5623±0.4610 MPa; Group 6, 10.8898±1.0416 MPa; Group 7, 10.8034±0.2272 MPa; Group 8, 9.8598±0.4725 MPa; Group 9, 7.3544±0.5790 MPa; Group 10, 8.3492±0.4759 MPa.
The 4META/MMA-TBB resin remnants were shown on Ni-Cr alloy crowns but not on Au-Pt alloy crowns. Group 6, 7 and 8 had more resin remnant than Group 9 and 10.
Discussion
V-primer application as a surface treatment method is efficient when bonding bracket on to gold crown using 4META/MMA-TBB. Comparing Group 1 and Group 2, the bonding strength showed a significant increase. Apply V-primer on Ni-Cr alloy crown did not increase bonding strength. According to the results of Group 2 and 3, Group 7 and 8, the using method of V-primer did not affect the bonding strength. After the water bath, the bonding strength significantly decreased.
Resin remnant percentage showed a relation with bonding strength. Group 6, 7 and 8 had more resin remnant than Group 9 and 10. And the bonding strength of Group 6, 7 and 8 were higher than Group 9 and 10. |
