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Table 1 Baseline characteristics of implants according to groups

From: Immediate implant placement following tooth extraction with simultaneous lateral sinus augmentation: a retrospective clinical study after at least 1 year of loading

   Group  
Variable Overall (n = 35) 1-Stage (non-submerged) (n = 17) 2-Stage (submerged) (n = 18) p
Age (year)     
 Mean ± SD 59.63 ± 11.04 60.29 ± 12.32 59.00 ± 10.01 .6312
 Range 35-78 38-78 35-71  
Gender     
 Male 23 (65.7) 10 (58.8) 13 (72.2) .4043
 Female 12 (34.3) 7 (41.2) 5 (27.8)  
Location of implant placement     
 First premolar 2 (5.7) 1 (5.9) 1 (5.6) .1464
 Second premolar 11 (31.4) 8 (47.1) 3 (16.7)  
 First molar 8 (22.9) 4 (23.5) 4 (22.2)  
 Second molar 14 (40.0) 4 (23.5) 10 (55.6)  
Length of fixture (mm)     
 Mean ± SD 11.97 ± 0.12 11.94 ± 0.17 12.00 ± 0.00 .5682
 Range 11.5-12 11.5-12 12-12  
 11.5 2 (5.7) 2 (11.8) 0 (0.0) .2294
 12 33 (94.3) 15 (88.2) 18 (100.0)  
Diameter of fixture (mm)     
 Mean ± SD 4.75 ± 0.39 4.78 ± 0.50 4.71 ± 0.24 .7822
 Range 4.3-6.0 4.3-6.0 4.3-5.2  
 4.3 11 (31.4) 7 (41.2) 4 (22.2) .0164
 4.8 17 (48.6) 4 (23.5) 13 (72.2)  
 5.2 6 (17.1) 5 (29.4) 1 (5.6)  
 6.0 1 (2.9) 1 (5.9) 0 (0.0)  
Residual bone height (mm)     
 Mean ± SD 5.62 ± 1.68 6.06 ± 2.11 5.19 ± 1.02 .1381
 Range 3.1-9.6 3.1-9.6 3.3-7.4  
Increased bone height (mm)     
 Mean ± SD 8.87 ± 2.74 7.86 ± 3.04 9.77 ± 2.15 .0401
 Range 3.00-15.30 3.00-14.90 6.20-15.30  
  1. Values are either frequency with percentage in parentheses or mean ± standard deviation
  2. 1P values were derived from independent t test
  3. 2P values were derived from Mann-Whitney’s U test
  4. 3P values were derived from chi-square test
  5. 4P values were derived from Fisher’s exact test
  6. Shapiro-Wilk’s test was employed for test of normality assumption