Table 2. Association of PBL and type of MT.

		MG										Chi-square	P value
		Normal		Flat thickening		Polypoid thickening		Occluded		Total
		No.	%	No.	%	No.	%	No.	%	No.	%
Tooth # 4	Normal	30	44.8	61	30.3	60	35.1	11	42.3	162	34.8	16.5	0.056
	P1	25	37.3	99	49.3	87	50.9	6	23.1	217	46.7
	P2	7	10.4	27	13.4	14	8.2	7	26.9	55	11.8
	P3	5	7.5	14	7.0	10	5.8	2	7.7	31	6.7
	Total	67	100.0	201	100.0	171	100.0	26	100.0	465	100.0
Tooth # 5	Normal	25	41.7	61	32.8	58	36.0	9	37.5	153	35.5	5.6	0.771
	P1	24	40.0	85	45.7	77	47.8	9	37.5	195	45.2
	P2	8	13.3	28	15.1	14	8.7	4	16.7	54	12.5
	P3	3	5.0	12	6.5	12	7.5	2	8.3	29	6.7
	Total	60	100.0	186	100.0	161	100.0	24	100.0	431	100.0
Tooth # 6	Normal	19	33.3	41	24.8	52	40.6	7	50.0	119	32.7	12.5	0.041*
	P1	28	49.1	72	43.6	46	35.9	3	21.4	149	40.9
	P2	8	14.0	25	15.2	17	13.3	3	21.4	53	14.6
	P3	2	3.5	27	16.4	13	10.2	1	7.1	43	11.8
	Total	57	100.0	165	100.0	128	100.0	14	100.0	364	100.0
Tooth # 7	Normal	24	36.4	46	25.4	46	28.4	9	39.1	125	28.9	9.04	0.433
	P1	28	42.4	78	43.1	68	42.0	5	21.7	179	41.4
	P2	8	12.1	32	17.7	30	18.5	4	17.4	74	17.1
	P3	6	9.1	25	13.8	18	11.1	5	21.7	54	12.5
	Total	66	100.0	181	100.0	162	100.0	23	100.0	432	100.0

* Significant correlation between PBL and type of MT.