Observation two groups 'therapeutic effect in the endodontic treatment.
观察两组在牙髓治疗中的疗效。
Primary data can be collected in four ways; observation, focus groups, surveys and experiment.
收集初级资料的方法有四种：观察、专题讨论、问卷调查和实验。
Results After 3 months of observation, there was significant differences in effects the two groups.
结果经过3个月的观察，两组在治疗效果上有明显差异。
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