表 2.

术前、术后1年、术后2年钙化桥指数(DBI)1~3级的分布

Percentage of dentin bridge index (DBI) from Level 1 to 3 before pulpotomy operation, 1-year and 2-year follow up

Level of DBI		Before operation (DBI0)			1-year follow-up (DBI1)			2-year follow-up (DBI2)
		Cases	Percentage		Cases	Percentage		Cases	Percentage
n=36, *P < 0.05, by rank sum test, the DBI difference among the three groups and between every two groups is statistically significant.
1	No dentin bridge	36	100		22	61.1*		16	44.4*
2	Thickness of dentin bridge < 1 mm	0	0		12	33.3*		13	36.1*
3	Thickness of dentinal bridge >1 mm	0	0		2	5.6*		7	19.4*