Ödman Anna, Bresin Andrea, Kiliaridis Stavros
a Department of Orthodontics, Institution of Odontology , The Sahlgrenska Academy at the University of Gothenburg , Gothenburg , Sweden.
b Mun-H-Center National Orofacial Resource Center for Rare Diseases, Public Dental Service in Västra Götaland , Gothenburg , Sweden.
Acta Odontol Scand. 2019 Apr;77(3):184-188. doi: 10.1080/00016357.2018.1531437. Epub 2019 Jan 9.
To experimentally investigate the effects of increased masticatory muscle function on the transverse cranial dimensions on adult rats with an earlier reduced masticatory muscle function.
Sixty young male rats were used. The experimental group received soft diet for a prolonged period, so that the animals developed weak masticatory muscles. A control group received ordinary hard food during the whole experimental period (27 weeks). After 21 weeks when the animals had nearly ceased their body growth the rats in the experimental group were divided into two groups. One group continued with soft diet until the end of the experiment (hypofunctional group). The other group received ordinary hard food to get the possibility to retrain their masticatory muscles (rehabilitation group). At week 21 and at the end of the experimental period (week 27), axial cephalograms were taken. Fourteen landmarks were defined to measure seven transverse distances of the skull.
The increase of the anterior zygomatic arch width and interzygomatic width during the experimental period were larger in the rehabilitation group compared to both the normal and the hypofunctional group.
Retraining of masticatory muscles in adult rats leads to increase of some transverse cranial dimensions.
通过实验研究咀嚼肌功能增强对咀嚼肌功能早期降低的成年大鼠颅骨横向尺寸的影响。
使用60只年轻雄性大鼠。实验组长期给予软食，以使动物咀嚼肌发育薄弱。对照组在整个实验期（27周）给予普通硬食。在动物几乎停止身体生长的21周后，将实验组大鼠分为两组。一组继续给予软食直至实验结束（功能低下组）。另一组给予普通硬食以使其有机会重新训练咀嚼肌（康复组）。在第21周和实验期末（第27周）拍摄头颅侧位片。定义14个标志点以测量颅骨的7个横向距离。
与正常组和功能低下组相比，康复组在实验期内颧弓前部宽度和颧间宽度的增加更大。
成年大鼠咀嚼肌的重新训练导致颅骨一些横向尺寸增加。
