Table 4. CT before and after operation.

Parameters	Group A (n=30)	Group B (n=30)	P
Preoperation	541.80±33.78	540.10±32.12	0.842
1d postoperation	590.30±51.38	588.57±44.92	0.139
1wk postoperation	559.80±39.08	562.00±31.77	0.812
4wk postoperation	558.33±38.22	546.40±31.27	0.191
6wk postoperation	556.50±39.83	546.17±31.69	0.208

(µm), x±s