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以前在小猎兔犬上对牙周伤口愈合的研究表明:新的结缔组织可在釉牙骨质界处附着于根面,并可达到原先的附着水平。这些结果可在局部及广泛水平牙槽骨缺失的牙周损伤中观察到。而且这些结果提供了在术后固定及支持龈瓣的重要性的证据。另一种支持龈瓣的方法,是将一型片或薄纸置于缝合的粘骨膜下,作者观察了小猎兔犬牙槽骨水平缺失后放置一生物相容性多孔的PTFE 薄膜环绕于牙齿上后,其愈合情况,并与未放置薄膜的对照组相比较.作者选用5只成年小猎兔犬的下颌第二、三、四前磨牙做实验。首先延伸颊舌侧粘骨膜瓣,拔除下颌第4前磨牙,沿余留牙的根面水平去除牙槽骨至能固位为止,根面暴露的范围从3 mm～6 mm 不等。一侧下颌的牙齿环绕一层厚0.5mm 的PTFE 薄膜,由于它有轻微的弹性,它可以紧贴牙冠部,薄膜应覆盖牙齿的根面及牙槽骨冠方2 mm～8 mm,复位的龈瓣应将薄膜盖住并位于釉牙骨质冠方1 mm～2 mm。以对侧
Previous studies on periodontal wound healing in Beagle dogs showed that new connective tissue could attach to the root surface at the enamel cementum and reach the original level of attachment. These results are observed in periodontal lesions with localized and extensive levels of alveolar bone loss. And these results provide evidence of the importance of postoperative fixation and support of the gingival flap. Another method of supporting the gingival flap is to place a sheet or tissue under a sutured mucoperiosteum and the authors observe that a beagle dog has a level of alveolar bone and a biocompatible, porous PTFE film placed around the tooth Then, the healing condition was compared with that of the control group without the film placement.The author chose 5 adult beagle dogs to experiment on the second, third and fourth premolar teeth. First, extend the buccal and lingual mucoperiosteal flap, remove the mandibular fourth premolar, and remove the alveolar bone along the root surface of the remaining teeth until it retains. The root surface exposures range from 3 mm to 6 mm. One side of the mandibular teeth surrounded by a layer of 0.5mm thick PTFE film, because it has a slight elasticity, it can close to the crown, the film should cover the root of the tooth and the alveolar bone square 2 mm ~ 8 mm, reset The gingival flap should be covered by the film and located in the enamel cementum crown 1 mm ~ 2 mm. Opposite side