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1.Baseline indexes
1.1.Inclusion criteria

Volunteers from Shanghai Jiao Tong University School of Medicine

Yes

Good oral hygiene

Yes

Aged at least eighteen years

Yes

Complete maxillary dental arch except the missing third molar

Yes

Intact hard and soft tissues, including treated teeth decay and healed teeth extraction socket

Yes

1.2.Exclusion criteria

Undergoing orthodontic treatment

No

With metal crowns and any other metal materials on teeth

No

Advanced periodontitis affecting gingival recession

No

Obvious teeth mobility (mobility degree higher than 1)

No

Obvious dentition malalinement (malalinement degree higher than 1)

No

2.Data of upper jaws
2.1.Palatal vault height

Palatal vault height

17.040 mm

2.2.Arch width

Arch width

37.924 mm

3.Accuracy of digital impressions
3.1.Trueness of full dentition

Trueness of full dentition

0.09533 mm

3.2.Precision of full dentition

Precision of full dentition

0.05800 mm

3.3.Trueness of palatal soft tissues

Trueness of full dentition

0.17550 mm

3.4.Precision of palatal soft tissues

Precision of palatal soft tissues

0.04200 mm

4.Adaptation of major connectors
4.1.Group Digital Impression

Landmark L3

524.41 μm

Landmark M3

618.61 μm

Landmark R3

529.36 μm

Landmark L2

702.16 μm

Landmark M2

477.36 μm

Landmark R2

614.72 μm

Landmark L1

72.94 μm

Landmark M1

73.86 μm

Landmark R1

94.13 μm

4.2.Group Conventional Impression

Landmark M1

59.55 μm

Landmark R1

74.61 μm

Landmark L3

209.46 μm

Landmark M3

403.10 μm

Landmark R3

117.77 μm

Landmark L2

235.92 μm

Landmark M2

448.53 μm

Landmark R2

256.91 μm

Landmark L1

72.04 μm