名词
中文翻译：严重的牙周炎
同义词：
['severe periodontitis', 'severe periodontal disease']
例句：
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1. The patient was diagnosed with severe periapical periodontitis and required immediate treatment.
患者被诊断出患有严重的牙周炎，需要立即治疗。
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2.Researchers have found that poor oral hygiene is a major risk factor for severe periapical periodontitis.
研究人员发现，口腔卫生不良是严重牙周炎的主要风险因素。
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3. Treatment of severe periapical periodontitis often requires aggressive surgical intervention.
治疗严重的牙周炎通常需要积极的外科干预。