美国的流行性牙周病可能明显高于原先估计的。
The prevalence of periodontal disease in the United States may be significantly higher than originally estimated.
治疗下颚第二大臼齿远心侧的环绕型骨性破坏，是牙周病科医师的一大挑战。
Treatment of deep circumferential bony defects around the mandibular secondary molars is a great challenge to periodontist.
结论采用牙周病理模型进行探诊基本训练有助于学生掌握牙周探诊技术，提高探诊准确性，从而为进入临床实习打好扎实基础。
Conclusion Practice of periodontal probing on periodontal pathological model was helpful to enhance the precision of the measurements of probing depth and the level of periodontal probing technique.
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