• 作者： 郭英雄; 增原英一
• 作者服務機構： 國立臺灣大學醫學院牙醫學系; 日本東京醫科齒科大學醫用器材研究所
• 中文摘要： 以65%磷酸處理前齒缺損之兩鄰接齒的琺瑯質，同時，取含5wt% 4-methacryloxyethyl
  trimellitate anhydride（4-META）的methyl methacrylate（MMA） 3滴與1滴Tri-n-butyl-
  borane（TBB）混合後，加適量之polymethyl methacrylate（PMMA）使呈泥狀混合物，用小
  筆塗於鄰接面，黏上樹脂義齒當橋體（pontic），則成為黏著式牙橋。在兩年的觀察期間，除有輕
  度牙齦炎外，所有8例之鄰接齒皆無牙髓症狀發生，其中2例至今尚未脫落，4例介於黏上後14
  至22個月間，才發生鬆動現象，另2例因外力過大而掉落，所以，MMA-4-META-TBB樹脂
  可用於1至2年的臨時性黏?式牙橋，而且，站在美觀和經濟的觀點來說，這種方法對缺損前齒
  的病患是很方便的。a
• 英文摘要： Traditionally, the missing tooth in the an-terior area is invariably restorated with eitherfixed porcelain bridge or removable partial den-ture. The former is expensive for the patientand requires irreversible loss of tooth structureof abutments. In the latter not only it is in-convenient to the patient for the necessity ofremoving and inserting denture after each meal,but also the abutments are in an environmentvulnerble to caries attack. Ideally the acid etched bridge is construc-ted in the patients with sound abutment teeth.The proximal surfaces of two neighbouringteeth are etched with 65% phosphoric acid for30 seconds. Monomer which contains 95 wt%methyl methacrylate (MMA) and 5 wt% 4-methacryloxyethyl trimellitate anhydride (4-META) is mixed, to tri-n-butylborane (TBB)in a proportion of 3 drops to 1 drop. Poly-methyl methacrylate (PMMA) with particle sizebelow 200 mesh is used as the adhesive betweenacrylic pontic and enamel of the neighbouringteeth. During a period of 2 years' observation,except slight gingivitis there is no pulpal symp-tom of the neighbouring teeth in all of 8 cases.The result shows that two cases are intact upto now, 4 cases happen to loose during 14 to22 months after initiation, and only 2 casesdrop out due to forceful mechanical attack. Itis assumed that MMA-4-META-TBB resin maybe used in adhesion bridge as transient for aperiod of 1 to 2 years. From esthetical andeconomical points of view, this method is con-venient to the patients who have anterior missingtooth.
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