Abstract
The lip closure effects after frenectomy of the upper labial frenum were studied by the high position of the upper labial frenum, the lip closing force, the upper lip pressure, the lower lip pressure and the upper-lower lip pressure ratio in 16 patients' control group (aged 5-7 years) and 14 patients which excised the upper labial frenum (aged 5-11 years). There was the position of the upper labial frenum which was smaller than before a control group, and the following measurements were significantly larger than after a resection of the lip closing force, the lower lip pressure and the upper lip pressure which had no significant difference before a control group and before a resection. And these are significantly larger than after a follow up in a resection group and after a control group. Moreover, the lower lip pressure after a resection and the follow up was significantly larger than the upper-lip pressure before and after a control group, but there was no significant difference before a resection group. The upper-lower lip pressure ratio was significantly larger than before a resection which were not significantly different before and after a resection and after a follow up in a control group. These results suggested that frenectomy of the upper labial frenum improves lip closure in children.
