An experimental study of increased vertical dimension in the growing face.
An experimental study of increased vertical dimension in the growing face.
复制标题
生长面垂直尺寸增加的实验研究。
DOI：
10.1016/0002-9416(77)90242-1
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
J. McNamara
中科院分区：
文献类型：
--
作者：
J. McNamara
本实验以5只幼年恒河猴为研究对象，研究了垂直向尺寸增加对颅面复合体结构的影响。用固定在上颌弓上的石膏咬合夹板将咬合打开2、3、10或15 mm，通过金属种植体的连续X线头影测量监测这些动物的适应性。这项研究的结果表明，在整个颅面复合体的具体结构适应的结果，在垂直尺寸的脸的任何变化。最明显的适应发生在上颌骨，该区域的正常向下位移减少，向前位移增加。适应不太明显，在下颌骨，除了在这些动物中，其中产生了严重的咬开口;在该地区的下颌角的吸收是明显的。牙齿的适应是次要的。这项研究表明，上颌骨复合体是一个非常可塑性的结构，其响应于咬合开口和改变肌肉长度的变化。临床医生应了解垂直尺寸的各种改变所导致的变化，以确保这些变化不会与他的总体治疗目标相抵触。他也可以在为某些临床病例设计治疗策略时利用这些变化。
Five juvenile rhesus monkeys were used in an experiment designed to study the structural adaptations in the craniofacial complex that resulted from increases in vertical dimension. The bite was opened 2, 3, 10, or 15 mm. by means of cast bite splints cemented on the maxillary arch. Adaptations were monitored in these animals by means of serial cephalometric radiography with metallic implants. The results of this study indicate that any change in the vertical dimension of the face results in specific structural adaptations throughout the craniofacial complex. The most significant adaptation occurred in the maxillary region, in which the normal downward displacement of this region was decrease and the anterior displacement was increased. Adaptation were less evident in the mandible, except in those animals in which a severe bite opening was produced; resorption in the region of the gonial angle was evident. Dentitional adaptations were of secondary importance. This study demonstrates that the maxillary complex is a very plastic structure which responds to changes in bite opening and altered muscle length. The clinician should be aware of the changes that result from various alterations of vertical dimension to make sure that these changes are not antagonistic to his over-all treatment goal. He may also take advantage of these changes when designing treatment strategies for certain clinical cases.