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Table 6 Characteristics of biofilm samples from implants with fixed and removable dentures

From: Removable denture is a risk indicator for peri-implantitis and facilitates expansion of specific periodontopathogens: a cross-sectional study

Types of prosthesis Fixed dentures (FD) Removable dentures (RD) Test for significant difference
Number of implant 20 11
Numbers of individuals 13 3
Implant location: quadrants (1, 2, 3, 4) 9 (45%), 7 (35%), 2 (10%), 2 (10%) 3 (27%), 1 (9%), 5 (46%), 2 (18%) n.s., Chi-Square Test
Implant location: maxillary 16/20 (80%) 4/11 (36%) p = 0.015, Chi-Square Test
Implant location: left 11/20 (55%) 8/11 (72%) n.s., Chi-Square Test
Type of replaced tooth (I, C, B, M) 0 (0%), 3 (15%), 6 (30%), 11 (55%) 4 (36%), 2 (18%), 4 (36%), 1 (9%) -
Location of replaced toot: front 3/20 (15%) 6/11 (55%) p = 0.020, Chi-Square Test
Implants from current smoker 0/20 (0%) 9/11 (82%) p < 0.001, Fisher exact test
Implant age (µ ± 95%CI) 7.2 ± 1.7 12.4 ± 1.1 p < 0.001, Two-Tailed T-Test
Pocket depth (µ ± 95%CI) 6.3 ± 0.9 8.4 ± 1.6 p = 0.016, Two-Tailed T-Test
Gingival index (1, 2, 3) 0 (0%), 11 (58%), 8 (42%) 1 (9%), 6 (66%), 4 (36%) -
Plaque index (0, 1, 2, 3) 1 (5%), 7 (37%), 6 (32%), 5 (26%) 0 (0%), 1 (9%), 1 (9%), 9 (82%) -
Bad oral hygiene 5/16 (31%) 11/11 (100%) p < 0.001, Fisher exact test
History of periodontal disease 20/20 (100%) 11/11 (100%) n.s., Fisher exact test
Pus 10/20 (50%) 6/11 (55%) n.s., Chi-Square Test
Pain 5/20 (24%) 1/11 (9%) n.s., Fisher exact test
Periotron (µ ± 95%CI) 116 ± 22 161 ± 21 n.s., Two-Tailed T-Test
Residual teeth 13/13 (100%) 1/3 (33%) p = 0.025, Fisher exact test
Patient sex: man 4/13 (30%) 1/3 (33%) n.s., Fisher exact test
Patient age (µ ± 95%CI) 72 ± 3 63 ± 5 n.s., Two-Tailed T-Test
  1. n.s.—the result is not significant at p < .05
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