Table 1.

Criteria and scores for histopathological evaluation.

a. Dentin bridge formation:
1	= Complete dentin bridge formation
2	= Partial dentin bridge formation (extending to more than one-half of the exposure site but not completely closing the exposure site)
3	= Initial dentin bridge formation (extending to not more than one-half of the exposure site)
4	= No dentin bridge formation
b. Dentin bridge thickness:
1	= >0.25 mm
2	= 0.1–0.25 mm
3	= <0.1 mm
4	= Absent bridge
c. Inflammatory response:
1	= Absent or very few inflammatory cells
2	= Mild (An average of <10 inflammatory cells)
3	= Moderate (An average of 10–25 inflammatory cells)
4	= Severe (An average of >25 inflammatory cells)