- 作者: 王蔚南
- 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: 複合樹脂運用到矯正學已有二十年以上的歷史,對附支物固定於牙齒表面之黏著強度,雖有許多研究及探討,然結論不一。本研究鑑於此,選擇60顆因須矯正治療而拔除的完好之年青人小臼齒,以Concise, Unitek, Ormco, American,Mono-lok及Right-on等6種不同廠牌之矯正用複合樹脂,依廠牌說明之臨床操作步驟,將附支物固定於牙齒頰面後,再使用拉力扭力機作拉伸黏著強度實驗;施予垂直拉力,至附支物與牙面之接合面拉斷為止。分別錄各檢體之最大拉斷力,並運用立體顯微鏡,掃描式電子顯微鏡,觀察各拉斷面之形態。同時亦以放射線能量散佈光譜儀,定性分析各附支物斷面之物質成分,期能瞭解各類複合樹脂在矯正學上之黏著效果。結果顯示Concise(0.69 kg/mm2)黏著力最強,Right-on(0.45 kg/mm2)較差。在附支物斷裂面上,除發現複合樹脂及附支物本身金屬外,尚有牙齒組織的成分被發現。粘著強度愈強,牙表面斷裂愈少,反之亦然。顯示複合樹脂之廠牌並非決定黏著強度之唯一因素。而牙本身表面硬度酸蝕液濃度及酸蝕時間之長短等亦為重要條件。 本研究對附支物與牙面之黏著力的本質探討成果不僅在臨床上提供矯正用複合樹脂之選用,在學術理論亦具有參考價值。
- 英文摘要: Composite resin has beeen used in the field of orthodontics for more than twenty years. Althoughthere have been many studies and discussions regarding the bond strength of orthodontic brackets to thehuman tooth surface, a definitive conclusion has not yet been established. In this study, sixty bicuspidsextracted from teenagers were employed for testing, in conjunction with 6 different brands of orthodonticresins: Concise, Unitek, Ormco, American, Mono-lok and Right-on. On the buccal surface of the crown,the tensile bond strength for the various resins were tested and recorded. The bond strength was 0.69kg/mm2 for Concise, 0.64 kg/mm 2 for Unitek, 0.58 Kg/mm2 for Ormco, 0.55 kg/mm2 for American,0.54 kg/mm2 for Mono-log and 0.45 kg/mm2 for Right-on, respectively. The broken surfaces were ex-amined by scanning electron microscopy, as well as energy dispersive x-ray spectrometry. The brokensurfaces were either at interface between the resin and bracket base, at the resin itself, interface betweentooth surface and resin or in a combination of them. On the broken surface of the bracket base, com-ponents of broken tooth fragments were also detected. The percentage for the frequency of samples ofeach type of orthodontic resin of broken tooth fragments found was 30% for Concise, 10% for Unitek, 50%for Ormco, 40% for American, 50% for Mono-lok and 80% for Right-on. The coefficient of correlationbetween bond strength and tooth fracture was determined to be -0.84, implying that orthodontic resinitself is probably not the only determinant for bond strength, and therefore the tooth surface structure, theconcentration of etching solution and time of etching deserve equal attention in regard to bound strength.
- 中文關鍵字: composite resin; bond strength; orthodontic bracket
- 英文關鍵字: --