Table 6 Distance differences between the posterior maxillary teeth and the maxillary sinus floor in skeletal Class I, II and III malocclusions

U4

5.3±4.3

6.8±5.6

6.1±4.7

0.07

9.6±8.3

10.7±8.9

10.6±8.3

0.37

U5

2.3±3.5

3.2±4.7

3.1±4.0

0.176

3.1±4.6

3.9±5.8

4.6±6.3

0.056

U6MB

1.1±3.0

1.7±4.1

1.8±3.5

0.358

1.5±3.5

2.1±4.5

2.4±4.2

0.111

U6DB

1.3±3.0

1.7±3.8

1.8±3.4

0.484

1.3±3.3

1.8±3.4

1.9±3.4

0.488

U6P

1.2±4.0

1.9±4.8

2.4±4.3

0.007

1.3±3.4

2.1±4.1

2.5±3.9

0.009

U7MB

0.4±3.1

0.6±3.4

0.9±3.5

0.135

0.5±3.0

0.9±2.8

1.0±3.1

0.076

U7DB

0.8±3.5

1.3±3.9

1.5±3.6

0.05

1.1±4.4

1.8±3.5

1.7±3.2

0.133

U7P

1.7±3.8

2.2±4.4

2.5±3.9

0.048

2.2±3.5

2.9±3.9

2.8±3.7

0.185