不同排龈药物的排龈效果观察

The retractive effects of different gingival retraction agents

目的观察不同排龈药物的排龈效果。方法选择30例志愿者的双侧上颌第一前磨牙(共60颗)作为研究牙齿,随机分成A～F共6组,分别使用含不同排龈药物的排龈线进行颊侧排龈处理。A组为盐酸四氢唑啉,B组为盐酸羟甲唑啉组,C组为盐酸肾上腺素,D组为氯化铝,E组为硫酸铁,F组为生理盐水。于排龈前后分别精确取模,获得排龈牙颊侧龈沟的清晰印模,在硬石膏模型上沿牙冠长轴方向制成经颊侧外形高点线的2 mm厚颊舌向切片,在显微镜下测量龈沟宽度并进行比较,以评价不同药物的排龈效果。结果各组排龈后的龈沟宽度均较排龈前增大(P<0.05)。A、B组的排龈效果优于C、F组,其差异有统计学意义(P<0.05);除与F组外,D、E组与其他各组间均无统计学差异(P>0.05);A、B组组间以及D、E组组间的差异均无统计学意义(P>0.05)。结论四氢唑啉类药物具有较理想的排龈效果。

Objective To evaluate the retractive effects of different gingival retraction agents.Methods Thirty subjects with healthy gingival conditions were recruited to the trial,and the buccal gingival sulcus of the hibateral first max-illary premolars of each subject（n=60） were treated randomly with one of the six agents—Group A was tetrahydrozoline hydrochloride,Group B was oxymetazoline hydrochloride,Group C was epinephrine hydrochlorid,Group D was AlCl3,Group E was Fe2（SO4）3,and Group F was normal saline as control.Both pre-treated and post-treated accurate impressions of buccal gingival sulcus of the experimental teeth were made,so were the anhydrite casts.The casts of experimental teeth were sectioned into 2 mm slices bucco-lingually at the buccal eminence.Then the width of the sulcus was measured as the distance from the tooth to the crest of the gingival under a low-power microscope to compare the effect of these gingival retraction agents.Results The width of gingival sulcus became larger after the treatment in all groups（P0.05）.Either Group A or Group B had greater gingival retraction effects than Group C and Group F（P0.05）.Except Group F,both Group D and Group E had no significant differences from the other groups（P0.05）.There was no statistically signification between Group D and Group E（P0.05）,neither was there any statistically significance between Group A and Group B（P0.05）.Conclusion Tetrahydrozoline manifested excellent effect of gingival retraction.