Table 6 The results of the Bonferroni test comparing the most and least attractive images with all other images. The full results of the Bonferroni test are presented as Appendix 1. The first number shows the extent of gingival display and the second number shows the buccal corridor width. Note: The perceptometric images are sorted in this table after data collection (for a better visualization); during the survey, the perceptometric images were randomized

Long 2mm 25% (the least attractive image)

Short 2mm 25%

-0.074

0.063

1.0

-0.321

0.173

Short 2mm 20%

-0.185

0.075

1.0

-0.480

0.109

Long 2mm 20%

-0.324

0.067

0.001497

-0.588

-0.060

Normal 2mm 25%

-0.361

0.090

0.037124

-0.715

-0.007

Short 6mm 15%

-0.370

0.087

0.015245

-0.713

-0.028

Long 2mm 15%

-0.657

0.078

0.000000

-0.965

-0.350

Short 2mm 2%

-0.676

0.094

0.000000

-1.046

-0.306

Normal 2mm 20%

-0.704

0.095

0.000000

-1.079

-0.328

Long 6mm 15%

-0.750

0.100

0.000000

-1.146

-0.354

Normal 6mm 15%

-0.796

0.103

0.000000

-1.204

-0.388

Long 2mm 2%

-0.815

0.103

0.000000

-1.221

-0.409

Short 2mm 15%

-0.861

0.093

0.000000

-1.230

-0.492

Short 2mm 10%

-0.907

0.104

0.000000

-1.318

-0.497

Long 2mm 10%

-1.093

0.107

0.000000

-1.516

-0.669

Short 4mm 15%

-1.185

0.093

0.000000

-1.553

-0.818

Normal 2mm 15%

-1.194

0.097

0.000000

-1.578

-0.811

Normal 2mm 2%

-1.222

0.119

0.000000

-1.690

-0.754

Normal 2mm 10%

-1.333

0.108

0.000000

-1.758

-0.908

Short 0mm 15%

-1.398

0.115

0.000000

-1.853

-0.943

Normal 4mm 15%

-1.417

0.102

0.000000

-1.819

-1.014

Long 4mm 15%

-1.472

0.100

0.000000

-1.866

-1.079

Short 2mm 15%

-1.500

0.110

0.000000

-1.933

-1.067

Normal 0mm 15%

-1.713

0.118

0.000000

-2.180

-1.246

Long 2mm 15%

-1.750

0.114

0.000000

-2.200

-1.300

Normal 2mm 15%

-1.926

0.102

0.000000

-2.327

-1.525

Long 0mm 15%

-2.102

0.109

0.000000

-2.533

-1.671

Long 0mm 15% (the most attractive image)

Long 2mm 25%

2.102

0.109

0.000000

1.671

2.533

Short 2mm 25%

2.028

0.105

0.000000

1.614

2.441

Short 2mm 20%

1.917

0.112

0.000000

1.473

2.361

Long 2mm 20%

1.778

0.116

0.000000

1.318

2.237

Normal 2mm 25%

1.741

0.122

0.000000

1.258

2.223

Short 6mm 15%

1.731

0.116

0.000000

1.274

2.189

Long 2mm 15%

1.444

0.107

0.000000

1.022

1.867

Short 2mm 2%

1.426

0.129

0.000000

0.917

1.935

Normal 2mm 20%

1.398

0.111

0.000000

0.961

1.835

Long 6mm 15%

1.352

0.100

0.000000

0.955

1.748

Normal 6mm 15%

1.306

0.115

0.000000

0.852

1.759

Long 2mm 2%

1.287

0.118

0.000000

0.823

1.751

Short 2mm 15%

1.241

0.111

0.000000

0.804

1.678

Short 2mm 10%

1.194

0.136

0.000000

0.659

1.730

Long 2mm 10%

1.009

0.118

0.000000

0.544

1.475

Short 4mm 15%

0.917

0.112

0.000000

0.473

1.361

Normal 2mm 15%

0.907

0.117

0.000000

0.444

1.370

Normal 2mm 2%

0.880

0.152

0.000026

0.279

1.480

Normal 2mm 10%

0.769

0.131

0.000016

0.253

1.284

Short 0mm 15%

0.704

0.121

0.000021

0.227

1.180

Normal 4mm 15%

0.685

0.111

0.000004

0.249

1.122

Long 4mm 15%

0.630

0.097

0.000001

0.246

1.013

Short 2mm 15%

0.602

0.123

0.001314

0.115

1.089

Normal 0mm 15%

0.389

0.103

0.097614

-0.019

0.797

Long 2mm 15%

0.352

0.098

0.172146

-0.034

0.738

Normal 2mm 15%

0.176

0.103

1.0

-0.229

0.581