The crown extension technique; The root hauling technique; The gum excision; The depth of gingivalsulcus.
牙冠延长术；根牵引术；牙龈切除术；龈沟深度。
2
Superior buccal gingivalsulcus incision dissection was made inferior to zygomatic bone and zygomatic arch periosteum.
口腔内上颊龈沟入路在颧骨及颧弓骨膜下剥离。
3
RESULTS: in the control group, there were scattered pathogenic bacteria on the teeth surface and bacterial plaque and great deal pathogenic bacteria in the teeth fissure and gingivalsulcus.