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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Effects of Class II treatment with a banded Herbst appliance on root lengths in the posterior dentition.
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Effects of Class II treatment with a banded Herbst appliance on root lengths in the posterior dentition.

机译：用带状Herbst矫治器对II类治疗对后牙列根长的影响。

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INTRODUCTION: The aim of this study was a retrospective analysis of posterior teeth in 20 adolescents and young adults with Angle Class II Division 1 malocclusion treated with a banded Herbst appliance to check for inhibited root development and apical root resorption. METHODS: Panoramic radiographs were taken of every patient at the beginning and after the completion of functional orthopedic treatment. The magnification of the area of the posterior teeth was determined individually for every radiograph. Then the vestibular lengths of the molars and premolars were assessed metrically. To assess root-length changes, the difference between the lengths of the teeth before and after treatment was calculated. RESULTS: After treatment with a banded Herbst appliance, tooth length generally increased in the area of the anchorage. But there was a tendency toward root-length decrease in teeth immediately adjacent to the Herbst fittings in the vestibular roots of both the maxillary first molars (distovestibular, -0.02 +/- 2.31 mm; mesiovestibular, -0.06 +/- 2.05 mm) and the mandibular first premolars (-0.46 +/- 3.53 mm). CONCLUSIONS: The banded Herbst appliance might deliver unphysiologic forces to immediate anchor teeth, thereby exposing these to a higher risk of root resorption than in other teeth incorporated into the anchorage either directly via bands or indirectly via occlusal or approximal contacts. Looking at uncompromised root morphology in the area of the anchorage, we believe that early treatment with fixed functional appliances can be predicted to yield better outcomes than late treatment because of the higher biologic tolerance expressed by teeth with an apical latency.
机译：引言：本研究的目的是回顾性分析20例采用带状Herbst矫治器治疗的Angle II级1分类错牙合畸形的青少年和年轻成年人的后牙，以检查牙根发育受抑制和根尖吸收。方法：在功能性骨科治疗的开始和完成后，对每位患者进行全景X线摄片。对于每张射线照相，分别确定后牙区域的放大率。然后，对臼齿和前磨牙的前庭长度进行公制评估。为了评估牙根长度的变化，计算了治疗前后牙齿长度之间的差异。结果：用带状Herbst矫治器治疗后，在锚固区域牙齿长度通常增加。但是，在上颌第一磨牙的前庭根中，紧邻Herbst配件的牙齿的根长有减小的趋势（前庭前牙，-0.02 +/- 2.31 mm;中前庭牙，-0.06 +/- 2.05 mm）和下颌第一前磨牙（-0.46 +/- 3.53 mm）。结论：带束带的Herbst矫治器可能会向非直接锚固牙齿传递非生理力，从而使它们比直接通过绑带或通过咬合或近似接触间接结合到锚固中的其他牙齿暴露于更高的牙根吸收风险。观察锚固区域未受损的根部形态，我们认为使用固定功能矫治器的早期治疗可比晚期治疗产生更好的结果，因为具有根尖潜伏期的牙齿表现出更高的生物耐受性。

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