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Evaluating the accuracy between hollow and solid dental aligner models: a comparative study of printing technologies

Ebru Yurdakurban

Ebru Yurdakurban

Department of Orthodontics, Faculty of Dentistry, Muğla Sıtkı Koçman UniversityMuğla, Turkey
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Yurdakurban, Ebru
, 
Kübra Gülnur Topsakal

Kübra Gülnur Topsakal

Department of Orthodontics, Gulhane Faculty of Dentistry, University of Health SciencesAnkara, Turkey
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Topsakal, Kübra Gülnur
, 
Gökhan Serhat Duran

Gökhan Serhat Duran

Department of Orthodontics, Faculty of Dentistry, Canakkale 18 March UniversityÇanakkale, Turkey
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Duran, Gökhan Serhat
 and 
Serkan Görgülü

Serkan Görgülü

Department of Orthodontics, Gulhane Faculty of Dentistry, University of Health SciencesAnkara, Turkey
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Görgülü, Serkan
  
Sep 24, 2024
Evaluating the accuracy between hollow and solid dental aligner models: a comparative study of printing technologies's Cover Image
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Published Online: Sep 24, 2024
Page range: 51 - 62
Received: Apr 01, 2024
Accepted: Aug 01, 2024
DOI: https://doi.org/10.2478/aoj-2024-0023
Keywords
© 2024 Ebru Yurdakurban et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

The flow chart of the study.
The flow chart of the study.

Figure 2.

Hollow designs with (A) 1 mm, (B) 2 mm, (C) 3 mm shell thickness and (D) Solid design.
Hollow designs with (A) 1 mm, (B) 2 mm, (C) 3 mm shell thickness and (D) Solid design.

Figure 3.

Dividing of the reference model into 5 different regions. (a) Molar Region (Right): right first and second molar teeth, palatal and buccal gingival area. (b) Canine-Premolars Region (Right): right canine and premolar teeth, palatal and buccal gingival area. (c) Anterior Region: right and left central and lateral teeth, palatal and buccal gingival area. (d) Canine-Premolar Region (Left): left canine and premolar teeth, palatal and buccal gingival area. (e) Molar Region (Left): left first and second molar teeth, palatal and buccal gingival area.
Dividing of the reference model into 5 different regions. (a) Molar Region (Right): right first and second molar teeth, palatal and buccal gingival area. (b) Canine-Premolars Region (Right): right canine and premolar teeth, palatal and buccal gingival area. (c) Anterior Region: right and left central and lateral teeth, palatal and buccal gingival area. (d) Canine-Premolar Region (Left): left canine and premolar teeth, palatal and buccal gingival area. (e) Molar Region (Left): left first and second molar teeth, palatal and buccal gingival area.

Figure 4.

Superimposition of reference and test model.
Superimposition of reference and test model.

Comparisons of Canine-Premolar Regions RMS values

Canine-Premolar Region (Right) Canine-Premolar Region (Left)
DLP1 Polyjet2 SLA3 DLP1 Polyjet2 SLA3
Designs Mean ± SD Mean ± SD Mean ± SD p1 Post-hoc1 Designs Mean±SD Mean±SD Mean±SD p1 Post Hoc1
1 mmA (n = 10) 0.1 ±0.02 0.15 ±0.09 0.16 ±0.10 0.238 — 1 mmA (n=10) 0.3 ±0.15 0.14 ± 0.1 1 0.41 ±0.19 0.002 2-3**
2 mmB (n = 10) 0.08 ±0.01 0.06 ±0.01 0.14 ±0.06 0.002 1-2* 1-3* 2-3* 2 mmB (n=10) 0.16 ± 0.03 0.06 ± 0.01 0.15 ± 0.05 0.001 1-2** 1-3* 2-3*
3 mnC (n = 10) 0.07 ±0.03 0.05±<0.01 0.10 ±0.03 0.008 2-3** 3 mmC (n=10) 0.09 ± 0.02 0.05±<0.01 0.08 ± 0.01 <0.001 1-2** 2-3**
SolidD (n = 10) 0.07 ±0.01 0.05 ±0.01 0.05 ±0.01 <0.001 1-2*** 1-3*** SolidD (n=10) 0.06 ± 0.01 0.05 ± 0.01 0.05±<0.0l <0.001 1-2** 1-3**
p2 0.003 <0.001 0.001 p2 <0.001 0.001 <0.001
Post-hoc2 A-C* A-D** A-B** A-D** B-D* Post-hoc2 A-B* A-B** A-B**
A-C*** A-C*** A-C** A-C**
A-D*** A-D*** B-D* A-D** A-D**

Comparisons of Molar Regions RMS values

Molar Region (Right) Molar Region (Left)
DLP1 Polyjet2 SLA3 DLP1 Polyjet2 SLA3
Designs Mean ± SD Mean ± SD Mean ± SD p1 Post-hoc1 Designs Mean ± SD Mean ± SD Mean ± SD p1 Post-hoc1
1 mmA (n = 10) 0.17 ±0.02 0.36 ± 0.26 0.41 ±0.13 0.033 1-3** 1 mmA (n=10) 0.72 ± 0.30 0.26 ±0.18 0.90 ±0.35 <0.001 1-2** 2-3**
2 mmB (n = 10) 0.16 ±0.04 0.10 ± 0.04 0.35 ± 0.08 <0.001 1-2**, 1-3*** 2-3*** 2 mmB (n=10) 0.52 ± 0.06 0.10 ±0,03 0.41 ±0.13 <0.001 1-2*** 2-3***
3 mmC (n = 10) 0.15 ±0.06 0.07 ± 0.01 0.32 ± 0.26 0.028 1-2* 2-3* 3 mmC (n=10) 0.34 ± 0.05 0.08 ±0.01 0.27 ±0.05 <0.001 1-2*** 1-3* 2-3***
SolidD (n = 10) 0.13 ±0.02 0.06 ± 0.02 0.12 ± 0.01 <0.001 1-2*** 2-3*** SolidD (n=10) 0.25 ± 0.02 0.05 ±0.01 0.13 ±0.01 <0.001 1-2*** 1-3*** 2-3***
p2 0.143 <0.001 <0.001 p2 <0.001 <0.001 <0.001
Post-hoc2 A-C* A-D** A-B** A-D** B-D* Post-hoc2 A-B* A-B** A-B** A-C**
A-C*** A-C*** A-C** A-D**
A-D*** A-D*** B-D* A-D**

Comparisons of Total Arch RMS values

DLP1 Polyjet2 SLA3
Designs Mean ± SD Mean ± SD Mean ± SD p1 Post-hoc1
1 mmA (n = 10) 0.36 ± 0.14 0.29 ± 0.13 0.57 ± 0.15 0.001 2-3*
2 mmB (n = 10) 0.26 ± 0.04 0.18 ± 0.07 0.34 ± 0.06 0.002 1-2* 1-3* 2-3*
3 mmC (n = 10) 0.21 ± 0.04 0.13 ± 0.06 0.24 ± 0.05 <0.001 1-2** 2-3**
SolidD (n=10) 0.09 ± 0.01 0.08 ± 0.03 0.14 ± 0.01 <0.001 1-3*** 2-3*
p2 <0.001 <0.001 <0.001
Post-hoc2 A-B*, A-C*** A-B*, A-C*** A-B***
A-D*** A-D*** A-C***
B-D*** B-D * A-D***
C-D*** B-D***

Percentages of resin amounts to be saved by using hollow models instead of solid models

Hollow Designs DLP Polyjet SLA
1 mm 70.8% 37.4% 57.3%
2 mm 45.3% 26.8% 39.7%
3 mm 31.4% 15.5% 26.5%

Comparisons of Anterior Region RMS values

DLP1 Polyjet2 SLA3
Designs Mean ± SD Mean ± SD Mean ± SD p1 Post-hoc1
1 mmA (n = 10) 0.08 ± 0.04 0.10 ± 0.02 0.12 ± 0.03 0.040 >0.05
2 mmB (n = 10) 0.06 ± 0.01 0.07 ± 0.01 0.09 ± 0.02 <0.001 1-3*** 2-3*
3 mmC (n = 10) 0.06 ± <0.01 0.06 ± 0.01 0.07 ± 0.01 0.002 1-2** 1-3** 2-3**
SolidD (n = 10) 0.05 ± 0.01 0.06 ± 0.01 0.04±<0.01 <0.001 1-2** 1-3** 2-3**
p2 0.003 <0.001 0.001
Post-hoc2 A-D** A-B***, A-C*** A-B**, A-C***
A-D*** A-D***, B-C*
B-D***, C-D**
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