Buchanan L S
Dental Education Laboratories, 1515 State Street, Suite 16, Santa Barbara, CA 93101, USA.
Int Endod J. 2000 Nov;33(6):516-29. doi: 10.1046/j.1365-2591.2000.00384.x.
To introduce the concept of variable taper instruments for predictable and ergonomic root canal preparation, and demonstrate the design features of Greater Taper files.
Optimal root canal shaping is difficult to practice and teach with traditional instruments. Instrument sequences are complex, with up to 18 instruments and 63 procedural stages, providing almost limitless scope for poor results and iatrogenic error. In the first of six articles, Dr Buchanan describes the Variable Taper concept, which grew from such frustrations, and represents a new concept in file design. Milled from NiTi alloys in tapers of 0.06, 0.08, 0.10 and 0.12 mm mm-1, with accessory files for wide canals, their design embodies the key shaping features of adequate coronal enlargement, full deep shape, and predictable apical resistance form case after case. The ease and simplicity of their use is described, and enhanced cleaning and obturation outcomes discussed in relation to their unique design features.
Canal preparation is difficult to practice and teach with traditional K-files and Gates Glidden drills. Variable Taper files are designed to offer the optimal preparation features of adequate (not excessive) coronal enlargement, full deep shape, and apical resistance form in a simple instrument sequence. Variable Taper technique is simple to master, and offers predictable cleaning and obturation outcomes, even in inexperienced hands.
介绍可变锥度器械用于可预测且符合人体工程学的根管预备的概念，并展示大锥度锉的设计特点。
使用传统器械难以实现和教授最佳的根管塑形。器械序列复杂，多达18种器械和63个操作步骤，导致出现不良结果和医源性错误的可能性几乎无穷无尽。在六篇文章的第一篇中，布坎南博士描述了可变锥度概念，它正是源于这些挫折，代表了锉设计中的一个新概念。由镍钛合金铣削而成，锥度分别为0.06、0.08、0.10和0.12毫米/毫米，配有用于宽大根管的辅助锉，其设计体现了关键的塑形特点，即每次都能实现足够的冠部扩大、完整的深部形态以及可预测的根尖阻力形。文中描述了其使用的简便性，并结合其独特的设计特点讨论了其在清洁和充填方面更好的效果。
使用传统的K锉和盖茨·格利登钻难以进行根管预备的实践和教学。可变锥度锉旨在通过简单的器械序列提供足够（而非过度）的冠部扩大、完整的深部形态以及根尖阻力形等最佳预备特点。可变锥度技术易于掌握，即使是经验不足的人使用也能获得可预测的清洁和充填效果。
