Table 2. All articles published from 1995 to 2016 regarding the discussion on periodontal disease associated with oral H. pylori.

Authors	Type	Country	No	Methods	Conclusion
Nisha et al.8	Original Research	India	500	Seropositive	Periodontal close to H. pylori
Ren et al.15	Original Research	China	691	PCR	Periodontal close to H. pylori
Yang et al.26	Original Research	China	212	PCR	Periodontal close to H. pylori
Gulseren et al.27	Original Research	Turkey	81	RUT	Periodontal close to H. pylori
Kazanowska et al.28	Original Research	Poland	126	PCR	Periodontal close to H. pylori
Zheng and Zou18	Original Research	China	70	PCR	Periodontal close to H. pylori
Veiga et al.20	Original Research	Portugal	447	PCR	No close relation
Ding et al.12	Original Research	China	1050	HPS	Periodontal close to H. pylori
Ogaya et al.11	Original Research	Japan	40	PCR	Periodontal close to H. pylori
Lauritano et al.29	Original Research	Italy		PCR	Periodontal close to H. pylori
Amin et al.31	Original Research	Iran	45	PCR	Periodontal close to H. pylori
Anand et al.46	Review Article	India		PCR	Periodontal close to H. pylori
Adler et al.13	Review Article	Argentina		PCR	Periodontal close to H. pylori
Abadi et al.32	Original Research	Iran	134	PCR	Periodontal close to H. pylori
Yang et al.33	Review Article	China		PCR	Periodontal close to H. pylori
Bharath et al.34	Original Research	India	56	PCR	Periodontal close to H. pylori
Al Sayed et al.16	Review Article	India		PCR	Periodontal close to H. pylori
Boylan et al.36	Original Research	USA	49120	Period exam	Periodontal close to H. pylori
Marbaix S et al.14	Review Article	France		PCR	Periodontal close to H. pylori
Irani et al.35	Original Research	Iran	228	PCR	Periodontal close to H. pylori
Hirsch et al.10	Original Research	Germany	10	PCR	Periodontal close to H. pylori
Salazar et al.37	Original Research	USA	131	Seropositive	Periodontal close to H. pylori
Fernandez et al.7	Original Research	Mexico	200	Seropositive	Periodontal close to H. pylori
Tsami et al.9	Original Research	Greece	35	Seropositive	Periodontal close to H. pylori
Chaudhry et al.25	Original Research	Pakistan	100	PCR	Periodontal close to H. pylori
Chen et al.30	Original Research	China	173	Saliva HP test	Periodontal close to H. pylori
Navabi et al.17	Review Article	Iran	1861	PCR	Periodontal close to H. pylori
Bago et al.39	Original Research	Croatia	56	PCR	Periodontal close to H. pylori
Namiot et al.23	Original Research	Poland	155	HP antigen	No close relation
Silva et al.24	Original Research	Brazil	115	PCR	Periodontal close to H. pylori
Cellini et al.38	Original Research	Italy	19	PCR	Periodontal close to H. pylori
Dye et al.6	Original Research	USA	4504	Seropositive	Periodontal close to H. pylori
Butt et al.21	Original Research	Pakistan	178	CLO test	Periodontal close to H. pylori
Hardo et al.19	Original Research	UK	62	PCR	Periodontal close to H. pylori