1.

患者及拔牙位点基本情况

Patient- and site-related characteristics in the two procedure groups

Items	Flap group	Flapless group	P
Age/years, x±s	49.3±7.4	46.1±5.9	0.247
Gender (male :female), n	9 :3	8 :4
Total number of teeth, n	12	12
Tooth position, n
Maxillary molar	2	2
Mandible molar	10	10
Probing depth/mm, x±s	5.9±1.4	5.9±2.0	0.972
Gingival recession/mm, x±s	1.0±0.9	1.4±1.2	0.442
Bleeding index, x±s	3.1±0.6	3.3±0.9	0.517
Healingtime/months, x±s	6.5±0.6	7.2±3.1	0.423