| 摘要 |
A method and a device for effecting the cordless retraction of the gingival sulcus tissue that includes a dam shaped to be fitted onto a tooth. The dam having a peripheral wall defining a well. The peripheral wall may be either pervious or impervious to light rays and opened at at least one end. The well of the dam is pre-filled with a predetermined amount of a flowable retraction material having a heavy viscosity or putty consistency. The preloaded tooth dam is fitted to a prepared tooth so that when pressure is applied onto the tooth dam, the retraction material is displaced under pressure and forced into the sulcus, causing the gingival tissue to retract away from the tooth to enlarge the gingival sulcus. In one form of the invention, the structure of the dam enables the retraction material to mechanically bond or adhere to the internal surfaces of the dam, permitting the retraction material to be removed simultaneously with the removal of the tooth dam to leave behind a clean enlarged sulcus.
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