Zheng Hua Zhu

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Root canals have a lot of variations in maxillary second molar and most molar have only three root canals. The emergence of 4 root canals in maxillary second molar with two palatal root canals is especially rare. A case of 5 root canals in maxillary second molar with two palatal root canals and two mesiobuccal root canals was successfully treated and(More)
OBJECTIVES/HYPOTHESIS To evaluate the histopathological effect of intranasal pulmonary surfactant (PS) on the eustachian tube (ET) in guinea pigs with otitis media with effusion (OME). STUDY DESIGN Randomized control trial. METHODS Nonviable heat-killed Hemophilus influenzae solution was injected into the tympanum of guinea pigs by a trans-eardrum(More)
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