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1.Baseline indexes
1.1.Inclusion criteria

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

Yes

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

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

17.569 mm

2.2.Arch width

Arch width

39.221 mm

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

Trueness of full dentition

0.07683 mm

3.2.Precision of full dentition

Precision of full dentition

0.04133 mm

3.3.Trueness of palatal soft tissues

Trueness of full dentition

0.09167 mm

3.4.Precision of palatal soft tissues

Precision of palatal soft tissues

0.04600 mm

4.Adaptation of major connectors
4.1.Group Digital Impression

Landmark R2

528.04 μm

Landmark L1

93.01 μm

Landmark M1

199.71 μm

Landmark R1

143.35 μm

Landmark L3

423.38 μm

Landmark M3

360.10 μm

Landmark R3

457.65 μm

Landmark L2

462.48 μm

Landmark M2

192.23 μm

4.2.Group Conventional Impression

Landmark L3

378.06 μm

Landmark M3

523.16 μm

Landmark R3

328.62 μm

Landmark L2

322.83 μm

Landmark M2

331.58 μm

Landmark R2

339.85 μm

Landmark L1

108.62 μm

Landmark M1

82.85 μm

Landmark R1

164.59 μm