Buchanan L S
Dental Education Laboratories, 1515 State Street, Suite 16, Santa Barbara, CA 93101, USA.
Int Endod J. 2001 Mar;34(2):149-56. doi: 10.1046/j.1365-2591.2001.00386.x.
To describe the preparation of Large Root canals with small apical diameters by the GT file technique.
Large Root canals with small apical diameters can usually be prepared with one to three GT files; one to nine clinical steps, and one to five minutes of clinical time. Following proper access, pulp tissue should be removed, and lubricant applied to prevent pulp compaction and blockage. Initial crown-down enlargement is accomplished with up to three standard GT rotary files 0.10, 0.08 and 0.06 taper, running at 300 r.p.m., and with light touch. Care should be taken not to overload instruments, and they should be withdrawn, cleaned and inspected whenever they bind. Sometimes, the shaping objective is achieved with a single instrument; often waves of instrumentation are required before the shaping objective file cuts to length. Prior to cone-fit, the apical resistance form is confirmed with conventional files, employed as feeler gauges of the tapering form created at the canal terminus. Regardless of the shaping time, canals should be soaked with sodium hypochlorite solution for at least 30 min for effective cleaning.
Large Root canals with small apical diameters should be prepared to shaping objectives 0.08 or 0.10 taper. Compacted pulp tissue causes many canal blockages. It should be removed early, and canals should be well lubricated. Large Root canals with small apical diameters should be prepared in crown-down sequence, with recapitulation of steps until the shaping objective is achieved. Apical resistance form should always be confirmed before cone-fit. Canals should be exposed to sodium hypochlorite for at least 30 min for effective cleaning.
描述使用GT锉技术预备根尖直径小的粗大根管。
根尖直径小的粗大根管通常可用1至3根GT锉、1至9个临床步骤以及1至5分钟的临床操作时间来预备。正确开髓后，应去除牙髓组织并使用润滑剂以防止牙髓被压实和堵塞。最初采用冠向深入法扩大根管，使用0.10、0.08和0.06锥度的标准GT旋转锉，转速为300转/分钟，轻触根管壁。应注意避免器械过载，器械一旦卡滞就应取出、清洁并检查。有时，一根器械就能达到根管成形目的；但通常在达到根管成形目的的锉达到工作长度之前，需要多次进行根管预备操作。在进行根管充填前，用传统锉确认根尖的抗阻力形态，这些传统锉用作根管末端形成的锥形形态的探测规。无论根管预备时间长短，根管都应用次氯酸钠溶液浸泡至少30分钟以进行有效清洁。
根尖直径小的粗大根管应预备成0.08或0.10锥度的根管形态。牙髓组织被压实会导致许多根管堵塞。应尽早去除牙髓组织，并充分润滑根管。根尖直径小的粗大根管应采用冠向深入法预备，重复操作步骤直至达到根管成形目的。在进行根管充填前，应始终确认根尖的抗阻力形态。根管应暴露于次氯酸钠中至少30分钟以进行有效清洁。
