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在根管治疗中,根管的机械预备是否合适,直接影响治疗的效果。机械预备的手段主要是通过扩大针扩大根管来实现的。其目的是去除根管壁上的感染物质,减缓弯曲根管的弯曲度,使细小的根管管径加大,便于封药及根管充填的操作。传统的根管预备把重点放在根尖部的清创和成形方面,然而器械要达到根尖部需要依赖根管全长的通畅,这就需要有一个良好的开端。因此,这里需要重点强调的是根管口及其狭窄的根管颈部的机械预备。国外文献曾报道下颌磨牙最狭窄处在根管的颈部,因
In root canal therapy, root canal mechanical preparation is appropriate, a direct impact on the treatment effect. The means of mechanical preparation is mainly achieved by expanding the needles and expanding the root canal. Its purpose is to remove the infected substance on the root canal wall, slow the curvature of the curved root canal, increase the diameter of the small root canal, and facilitate the operation of sealing and root canal filling. Traditional root canal preparation has focused on the debridement and shaping of the apical portion, however, the instrument needs to reach the apical portion to rely on the full length of the root canal, which requires a good start. Therefore, what needs to be emphasized here is the mechanical preparation of the root orifice and its narrow root canal neck. Foreign literature has reported that the most narrow mandibular molar root canal in the neck, due