乳磨牙根尖周炎对继承恒牙颌骨内萌出速度的影响

The effect of apical periodontitis of deciduous molar on the eruption of succedaneous premolar in mandible

目的采用半口对照的方法研究下颌乳磨牙根尖周病变对其继承恒牙在下颌骨内萌出状态的影响。方法以分角投照技术拍摄52名6～8岁半儿童下颌乳磨牙与第一恒磨牙的根尖片,以下颌第一乳牙相对健康侧为对照侧,对侧患根尖周病变侧为实验侧,在X片中分别测量两侧下颌第一乳磨牙下方前磨牙牙胚最高点至预先制定基准线的垂直距离,并比较双侧差异;治疗前数据采集后对52颗乳磨牙进行常规根管治疗,1年后再次测量双侧数据,并比较差异,采用t检验进行统计学处理。结果治疗前和治疗1年后患根尖周病变乳牙下方恒牙萌出高度与对照侧相比差异有统计学意义。结论与对照侧相比,患根尖周病变的乳磨牙下方继承恒牙萌出有加快的趋势。

Objective To study the effect of apical periodontitis of deciduous molar on the eruption of succedaneous premolar in mandible. Methods X-ray system was used to take periapieal films of mandibular primary molars of 52 children aged from six to eight and a half years. The vertical distances between the highest point of the first permanent premolar tooth bud and the base line were measured. The measures of the healthy and the lesion side of the premolars were compared with each other to find their difference before the molars received their treatment for one year. The data about the premolars after the treatment were gathered, compared and evaluated by the t-test. Results The first mandibular permanent premolars beneath the deciduous molar in the lesion side grew faster than those in the healthy side and the difference between the growth had a statistically significance. Conclusion Compared with the that of the permanent premolars in the healthy side, the growth of the permanent premolars in the lesion side tended to be faster.