Methods 212 cases of primary molars were treated with direct pulp capping (Ca(OH) 2) after low pulpotomy and the other 126 were treated after half devitalization with FC.

• 方法338例乳磨牙随机分为根管低位活髓切断术直接盖髓充填治疗212例和FC半失活根管低位断髓术充填治疗126例。