Table 1.

Histological parameter scores for all groups

Group	Histological parameter	Tetracycline	Chlorhexidine gluconate	Myrrh	Control
24 hours	Mucosal continuity	0	0	0	0
	Granulation tissue	0	0	0	0
	Necrosis	0	0	+	++
	Vascularity	+	++	+	+
	PMNs	+++	+	++	+++
	Macrophages	0	0	0	0
	Lymphocytes	0	0	0	0
	Plasma cells	++	+	++	++
	Fibroblasts	0	0	0	0
48 hours	Mucosal continuity	0	0	0	0
	Granulation tissue	0	0	0	0
	Necrosis	0	+	+	++
	Vascularity	++	++	++	++
	PMNs	++	+	+	+++
	Macrophages	+	+	+	+
	Lymphocytes	+	+	+	+
	Plasma cells	++	+	+	++
	Fibroblasts	0	0	+	0
1 week	Mucosal continuity	+++	+++	+++	+++
	Granulation tissue	+++	++	++	++
	Necrosis	0	0	0	0
	Vascularity	++	+	+++	+
	PMNs	0	0	+	0
	Macrophages	+	+	+	+++
	Lymphocytes	+	+	0	+
	Plasma cells	++	++	++	++
	Fibroblasts	++	++	++	++
2 weeks	Mucosal continuity	+++	+++	+++	+++
	Granulation tissue	++	++	++	++
	Necrosis	0	0	+++	0
	Vascularity	+	+	+	+
	PMNs	0	0	+++	0
	Macrophages	+	+	+	+
	Lymphocytes	0	0	+	0
	Plasma cells	+	+	++	+
	Fibroblasts	++	++	+	++
4 weeks	Mucosal continuity	+++	+++	+++	+++
	Granulation tissue	+	+	++	+
	Necrosis	0	0	0	0
	Vascularity	+	+	+	+
	PMNs	0	0	0	0
	Macrophages	0	0	+	0
	Lymphocytes	0	0	0	0
	Plasma cells	+	+	++	+
	Fibroblasts	+	+	++	+

Note: 0 = none, + = mild, ++ = moderate, +++ = severe/dense.

Abbreviation: PMNs, polymorphonuclear leukocytes.