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上颌窦的底壁由前向后盖过上颌第二前磨牙至第三磨牙的根尖,与牙根尖之间以较薄的骨板相隔,有的甚至无骨板而仅覆以黏膜[1]。上颌磨牙断根拔除时,易
The bottom wall of the maxillary sinus is covered with apexes of the maxillary second premolar to the third molar from anterior to posterior, separated from the root of the aponeurosis by a thinner plate, and some are even covered with mucosa without bone plate [1 ]. Maxillary molar removal of roots, easy