Abstract Objective：To evaluate simultaneous apical surgery with crown lengthening for severe periapical diseases in short-term.Method：The total of 6 patients from Guangdong Provincial Stomatological Hospital from Sep 2013 to Oct 2014，6 cases with 23 roots with severe periapical lesions were treated using simultaneous apical surgery with crown lengthening for resecting apical lesion，trimming gingival margin，shaping alveolar，improving clinical crown height at the same time，provisional restorations before and after surgeries，then final restorations 3 months after surgeries.Evaluation of bone healing by
CBCT，soft tissue healing by PES.Result：Periapical defect filled with new bone，gingival margins and restorations were stable 6 months after surgeries.Conclusion：Simultaneous apical surgery and crown lengthening is a valid treatment to severe periapical diseases.
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