PURPOSE: to investigate the effect of root canal anatomy in maxillary first premolars on root canal treatment difficulty.
目的：探讨上颌第一前磨牙的根管解剖形态对根管治疗术难度的影响。
The committee recognizes the difficulty in identifying infants infected with HIV at birth in settings where diagnostic and treatment services for mothers and infants are limited.
委员会认识到，在对母亲和婴儿的诊断和治疗服务有限的地方很难在出生时确定婴儿是否已感染HIV。
But the study indicates "that even the most motivated patients will have difficulty obtaining timely appointments and pursuing treatment for mental health complaints."
但是研究表明“甚至最有动机的患者亦很难获得及时的预约、为精神疾病谋求治疗。”
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