光动力疗法联合龈下刮治和根面平整术治疗重度慢性牙周炎的疗效观察
광동력요법연합간하괄치화근면평정술치료중도만성아주염적료효관찰
A clinical observation of photodynamic therapy as an adjunctive to scaling and root planing in treatment of severe chronic periodontitis
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