Table 3 Periodontal response to a fixed retainer (12 units) (maxillary dentition).

From: Analysis of quality of life and periodontal health with an eight-unit maxillary fixed retainer through a prospective clinical trial

 

Pre-retention (T0)

Post-retention (T1)

Difference (T1-T0)

95% CI

P value

Mean (SD)

Probing deptha

Buccal

3.06 (0.55)

2.26 (0.26)

− 0.80 (0.49)

− 1.00, − 0.61

< 0.001*

Palatal

3.16 (0.45)

2.25 (0.29)

− 0.91 (0.38)

− 1.06, − 0.76

< 0.001*

Average

3.11 (0.48)

2.25 (0.27)

− 0.86 (0.42)

− 1.02, − 0.69

< 0.001*

Gingival indexb

Buccal

1.45 (0.52)

0.66 (0.42)

− 0.78 (0.32)

− 0.91, − 0.66

< 0.001*

Palatal

1.49 (0.53)

0.69 (0.37)

− 0.80 (0.29)

− 0.91, − 0.68

< 0.001*

Average

1.47 (0.52)

0.68 (0.37)

− 0.79 (0.26)

− 0.89, − 0.69

< 0.001*

Plaque indexa

Buccal

2.18 (0.46)

1.19 (0.39)

− 0.99 (0.38)

− 1.14, − 0.85

< 0.001*

Palatal

2.12 (0.49)

1.20 (0.43)

− 0.92 (0.46)

− 1.10, − 0.74

< 0.001*

Average

2.14 (0.46)

1.19 (0.38)

− 0.95 (0.40)

− 1.11, − 0.80

< 0.001*

Bleeding indexa

Buccal

1.81 (0.64)

0.89 (0.45)

− 0.92 (0.34)

− 1.05, − 0.79

< 0.001*

Palatal

1.81 (0.64)

0.89 (0.47)

− 0.92 (0.40)

− 1.07, − 0.76

< 0.001*

Average

1.81 (0.62)

0.89 (0.43)

− 0.92 (0.32)

− 1.04, − 0.80

< 0.001*

Mobilityb

Buccal

0.15 (0.17)

0.006 (0.03)

− 0.14 (0.15)

− 0.20, − 0.08

< 0.001*

Palatal

0.15 (0.17)

0.006 (0.03)

− 0.14 (0.15)

− 0.20, − 0.08

< 0.001*

Average

0.15 (0.17)

0.006 (0.03)

− 0.14 (0.15)

− 0.20, − 0.08

< 0.001*

  1. SD standard deviation, CI confidence Interval. aPaired samples t-test, bWilcoxon signed ranks test. *Statistically significant at p-value < 0.05.
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