Effect of Curing Time and Nitrogen Generator Usage on Direct 3D-Printed Aligners Thicknesses—An In Vitro Micro-CT Study
Abstract
:1. Introduction
2. Materials and Methods
2.1. Virtual Setup
2.2. Aligner Production
2.3. Micro-Computed Tomography and Image Processing
2.4. Thickness Measurements
2.5. Statistical Analysis
3. Results
3.1. Impact of Curing Time
3.2. Impact of Nitrogen Generator
3.3. Impact of Tooth Type and Site
3.4. Heterogeneity
3.5. 3D Images
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Printer Plate Angulation | Curing Time | Nitrogen Generator | N |
---|---|---|---|
60° | 15 min | yes | 5 |
60° | 20 min | yes | 5 |
60° | 25 min | yes | 5 |
60° | 30 min | yes | 5 |
60° | 40 min | yes | 5 |
60° | 50 min | yes | 5 |
60° | 30 min | no | 5 |
Reference Point | Definition | Assessed at Teeth |
---|---|---|
MB | mesiobuccal cusp tip | 16, 26 |
MP | mesiopalatal cusp tip | 16, 26 |
DB | distobuccal cusp tip | 16, 26 |
DP | distopalatal cusp tip | 16, 26 |
FIS | mesiodistal centre of the central fissure | 16, 15, 14, 24, 25, 26 |
V | central point of the facial surface | All teeth |
B | buccal cusp tip | 15, 14, 25, 24 |
P | palatal cusp tip | 15, 14, 25, 24 |
I | most coronal, central point of the incisal edge | 11, 21, 12, 22, 13, 23 |
1.6 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
---|---|---|---|---|---|---|---|---|
MB | 0.56 [0.51, 0.56] | 0.58 [0.55, 0.62] | 0.56 [0.56, 0.61] | 0.56 [0.51, 0.61] | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.56] | 0.359 |
MP | 0.65 [0.61, 0.70] | 0.68 [0.64, 0.70] | 0.70 [0.70, 0.75] | 0.61 [0.61, 0.66] | 0.70 [0.66, 0.75] | 0.66 [0.61, 0.66] | 0.61 [0.61, 0.66] | 0.010 |
DB | 0.61 [0.56, 0.61] | 0.63 [0.61, 0.66] | 0.61 [0.61, 0.66] | 0.56 [0.56, 0.61] | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.61] | 0.66 [0.61, 0.66] | 0.010 |
DP | 0.65 [0.65, 0.75] | 0.73 [0.69, 0.76] | 0.75 [0.70, 0.75] | 0.70 [0.61, 0.75] | 0.66 [0.66, 0.70] | 0.66 [0.61, 0.66] | 0.66 [0.66, 0.70] | 0.453 |
FIS | 0.75 [0.71, 0.80] | 0.75 [0.73, 0.76] | 0.75 [0.75, 0.84] | 0.75 [0.66, 0.75] | 0.80 [0.70, 0.84] | 0.75 [0.75, 0.75] | 0.80 [0.75, 0.84] | 0.638 |
V | 0.51 [0.51, 0.56] | 0.54 [0.51, 0.57] | 0.56 [0.51, 0.56] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.51] | 0.456 |
1.5 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
B | 0.61 [0.61, 0.66] | 0.66 [0.61, 0.70] | 0.66 [0.66, 0.66] | 0.61 [0.61, 0.61] | 0.61 [0.56, 0.61] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.61] | 0.032 |
P | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.70 [0.66, 0.70] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.61] | 0.61 [0.56, 0.66] | 0.61 [0.61, 0.66] | 0.008 |
FIS | 0.78 ± 0.06 | 0.85 ± 0.02 | 0.81 ± 0.08 | 0.77 ± 0.03 | 0.73 ± 0.04 | 0.73 ± 0.08 | 0.80 ± 0.07 | 0.018 |
V | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.51] | 0.51 [0.47, 0.56] | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.832 |
1.4 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
B | 0.56 [0.56, 0.61] | 0.56 [0.56, 0.56] | 0.61 [0.61, 0.61] | 0.56 [0.56, 0.56] | 0.61 [0.56, 0.61] | 0.61 [0.56, 0.61] | 0.56 [0.51, 0.56] | 0.201 |
P | 0.65 [0.61, 0.70] | 0.70 [0.61, 0.70] | 0.70 [0.70, 0.75] | 0.66 [0.66, 0.70] | 0.66 [0.66, 0.66] | 0.70 [0.66, 0.70] | 0.61 [0.61, 0.66] | 0.084 |
FIS | 0.84 [0.80, 0.89] | 0.89 [0.80, 0.89] | 0.89 [0.84, 0.89] | 0.80 [0.80, 0.84] | 0.80 [0.66, 0.80] | 0.84 [0.70, 0.89] | 0.84 [0.84, 0.89] | 0.037 |
V | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.56] | 0.337 |
1.3 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.61 [0.56, 0.61] | 0.61 [0.56, 0.61] | 0.61 [0.56, 0.61] | 0.56 [0.56, 0.56] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.61] | 0.076 |
V | 0.56 [0.56, 0.56] | 0.66 [0.61, 0.66] | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.61] | 0.56 [0.56, 0.56] | 0.185 |
1.2 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.61 [0.56, 0.66] | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.70] | 0.56 [0.56, 0.56] | 0.66 [0.66, 0.66] | 0.61 [0.61, 0.66] | 0.61 [0.56, 0.61] | 0.001 |
V | 0.65 [0.61, 0.65 | 0.70 [0.66, 0.70] | 0.66 [0.61, 0.66] | 0.61 [0.61, 0.66] | 0.56 [0.56, 0.61] | 0.61 [0.61, 0.61] | 0.66 [0.66, 0.66] | 0.020 |
1.1 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.65 [0.65, 0.70] | 0.70 [0.66, 0.70] | 0.66 [0.61, 0.75] | 0.61 [0.61, 0.66] | 0.70 [0.66, 0.75] | 0.70 [0.66, 0.70] | 0.66 [0.66, 0.66] | 0.158 |
V | 0.75 [0.75, 0.80] | 0.84 [0.84, 0.89] | 0.80 [0.80, 0.80] | 0.70 [0.70, 0.70] | 0.75 [0.70, 0.75] | 0.80 [0.80, 0.80] | 0.80 [0.75, 0.80] | 0.001 |
2.1 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.75 [0.70, 0.80] | 0.75 [0.75, 0.80] | 0.75 [0.75, 0.80] | 0.70 [0.70, 0.70] | 0.94 [0.84, 0.94] | 0.84 [0.80, 0.98] | 0.75 [0.70, 0.75] | 0.009 |
V | 0.80 [0.75, 0.80] | 0.84 [0.80, 0.84] | 0.80 [0.75, 0.80] | 0.70 [0.70, 0.70] | 0.75 [0.75, 0.80] | 0.80 [0.80, 0.80] | 0.80 [0.80, 0.80] | 0.004 |
2.2 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.61 [0.58, 0.66] | 0.66 [0.66, 0.66] | 0.66 [0.61, 0.66] | 0.56 [0.56, 0.56] | 0.66 [0.61, 0.70] | 0.66 [0.61, 0.66] | 0.61 [0.61, 0.61] | 0.020 |
V | 0.65 [0.61, 0.70] | 0.70 [0.66, 0.70] | 0.66 [0.61, 0.66] | 0.66 [0.61, 0.70] | 0.66 [0.61, 0.66] | 0.70 [0.66, 0.70] | 0.66 [0.66, 0.66] | 0.360 |
2.3 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
I | 0.61 [0.61, 0.66] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.66] | 0.56 [0.56, 0.61] | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.61 [0.61, 0.61] | 0.009 |
V | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.61] | 0.56 [0.51, 0.56] | 0.56 [0.51, 0.56] | 0.56 [0.56, 0.61] | 0.56 [0.56, 0.56] | 0.263 |
2.4 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
B | 0.61 [0.61, 0.66] | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.61 [0.56, 0.61] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.66] | 0.61 [0.61, 0.61] | 0.014 |
P | 0.65 [0.63, 0.70] | 0.70 [0.66, 0.70] | 0.70 [0.70, 0.75] | 0.66 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.70 [0.66, 0.75] | 0.66 [0.66, 0.70] | 0.072 |
FIS | 0.75 [0.70, 0.80] | 0.75 [0.75, 0.84] | 0.80 [0.75, 0.80] | 0.75 [0.70, 0.80] | 0.70 [0.66, 0.80] | 0.70 [0.51, 0.75] | 0.84 [0.80, 0.84] | 0.158 |
V | 0.51 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.56 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.51] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.56] | 0.102 |
2.5 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
B | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.70] | 0.66 [0.61, 0.66] | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.66] | 0.66 [0.61, 0.66] | 0.66 [0.61, 0.66] | 0.206 |
P | 0.66 [0.61, 0.70 | 0.70 [0.70, 0.70] | 0.70 [0.70, 0.75] | 0.66 [0.61, 0.66] | 0.66 [0.61, 0.66] | 0.61 [0.56, 0.66] | 0.66 [0.66, 0.70] | 0.015 |
FIS | 0.75 ± 0.10 | 0.81 ± 0.10 | 0.80 ± 0.07 | 0.77 ± 0.06 | 0.74 ± 0.10 | 0.66 ± 0.12 | 0.80 ± 0.08 | 0.110 |
V | 0.51 [0.51, 0.56] | 0.56 [0.51, 0.56] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.51] | 0.56 [0.56, 0.56] | 0.56 [0.51, 0.56] | 0.267 |
2.6 | Overall | 15 Min | 20 Min | 25 Min | 30 Min | 40 Min | 50 Min | p-Value |
MB | 0.66 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.66 [0.66, 0.70] | 0.61 [0.61, 0.66] | 0.70 [0.70, 0.70] | 0.61 [0.61, 0.61] | 0.66 [0.61, 0.66] | 0.014 |
MP | 0.66 [0.61, 0.72] | 0.66 [0.61, 0.75] | 0.70 [0.70, 0.75] | 0.61 [0.61, 0.66] | 0.70 [0.66, 0.80] | 0.80 [0.66, 0.94] | 0.66 [0.61, 0.66] | 0.157 |
DB | 0.66 [0.66, 0.70] | 0.70 [0.70, 0.75] | 0.70 [0.66, 0.70] | 0.66 [0.66, 0.66] | 0.70 [0.66, 0.70] | 0.66 [0.61, 0.70] | 0.70 [0.66, 0.70] | 0.168 |
DP | 0.66 [0.61, 0.68] | 0.66 [0.66, 0.70] | 0.70 [0.66, 0.70] | 0.61 [0.56, 0.61] | 0.66 [0.66, 0.70] | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.038 |
FIS | 0.71 ± 0.08 | 0.69 ± 0.02 | 0.76 ± 0.04 | 0.69 ± 0.06 | 0.78 ± 0.10 | 0.62 ± 0.13 | 0.69 ± 0.07 | 0.050 |
V | 0.56 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.61] | 0.56 [0.51, 0.56] | 0.010 |
1.6 | Without N2 | With N2 | p-Value |
---|---|---|---|
MB | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.56] | 0.910 |
MP | 0.61 [0.61, 0.61] | 0.70 [0.66, 0.75] | 0.007 |
DB | 0.56 [0.56, 0.61] | 0.51 [0.51, 0.56] | 0.125 |
DP | 0.66 [0.61, 0.66] | 0.66 [0.66, 0.70] | 0.515 |
FIS | 0.75 [0.75, 0.75] | 0.80 [0.70, 0.84] | 0.443 |
V | 0.56 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.221 |
1.5 | Without N2 | With N2 | p-Value |
B | 0.56 [0.56, 0.56] | 0.61 [0.56, 0.61] | 0.324 |
P | 0.61 [0.61, 0.61] | 0.61 [0.61, 0.61] | 0.317 |
FIS | 0.79 ± 0.02 | 0.73 ± 0.04 | 0.028 |
V | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.56] | 0.519 |
1.4 | Without N2 | With N2 | p-Value |
B | 0.56 [0.51, 0.56] | 0.61 [0.56, 0.61] | 0.100 |
P | 0.56 [0.56, 0.61] | 0.66 [0.66, 0.66] | 0.081 |
FIS | 0.80 [0.75, 0.80] | 0.80 [0.66, 0.80] | 0.435 |
V | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.56] | 0.288 |
1.3 | Without N2 | With N2 | p-Value |
I | 0.56 [0.51, 0.56] | 0.61 [0.61, 0.61] | 0.014 |
V | 0.56 [0.56, 0.56] | 0.56 [0.56, 0.56] | 0.606 |
1.2 | Without N2 | With N2 | p-Value |
I | 0.56 [0.56, 0.61] | 0.66 [0.66, 0.66] | 0.011 |
V | 0.66 [0.66, 0.66] | 0.56 [0.56, 0.61] | 0.037 |
1.1 | Without N2 | With N2 | p-Value |
I | 0.66 [0.66, 0.70] | 0.70 [0.66, 0.75] | 0.230 |
V | 0.75 [0.75, 0.75] | 0.75 [0.70, 0.75] | 0.093 |
2.1 | Without N2 | With N2 | p-Value |
I | 0.75 [0.70, 0.75] | 0.94 [0.84, 0.94] | 0.010 |
V | 0.75 [0.70, 0.75] | 0.75 [0.75, 0.80] | 0.059 |
2.2 | Without N2 | With N2 | p-Value |
I | 0.61 [0.56, 0.61] | 0.66 [0.61, 0.70] | 0.033 |
V | 0.61 [0.61, 0.66] | 0.66 [0.61, 0.66] | 0.316 |
2.3 | Without N2 | With N2 | p-Value |
I | 0.56 [0.56, 0.56] | 0.61 [0.61, 0.66] | 0.014 |
V | 0.56 [0.56, 0.56] | 0.56 [0.51, 0.56] | 0.093 |
2.4 | Without N2 | With N2 | p-Value |
B | 0.61 [0.56, 0.61] | 0.61 [0.61, 0.61] | 0.345 |
P | 0.61 [0.61, 0.66] | 0.66 [0.66, 0.66] | 0.429 |
FIS | 0.75 [0.70, 0.80] | 0.70 [0.66, 0.80] | 0.915 |
V | 0.51 [0.51, 0.56] | 0.51 [0.51, 0.51] | 0.134 |
2.5 | Without N2 | With N2 | p-Value |
B | 0.61 [0.56, 0.61] | 0.61 [0.61, 0.66] | 0.212 |
P | 0.61 [0.61, 0.61] | 0.66 [0.61, 0.66] | 0.262 |
FIS | 0.72 ± 0.09 | 0.74 ± 0.10 | 0.767 |
V | 0.51 [0.51, 0.51] | 0.51 [0.51, 0.51] | 1.000 |
2.6 | Without N2 | With N2 | p-Value |
MB | 0.61 [0.61, 0.61] | 0.70 [0.70, 0.70] | 0.005 |
MP | 0.61 [0.61, 0.61] | 0.70 [0.66, 0.80] | 0.019 |
DB | 0.61 [0.61, 0.61] | 0.70 [0.66, 0.70] | 0.037 |
DP | 0.66 [0.66, 0.66] | 0.66 [0.66, 0.70] | 0.736 |
FIS | 0.71 ± 0.06 | 0.78 ± 0.10 | 0.237 |
V | 0.56 [0.51, 0.56] | 0.56 [0.56, 0.56] | 0.343 |
Thickness | p-Value | Ce | L | Ca | 1P | 2P | M | |
---|---|---|---|---|---|---|---|---|
Ce | 0.75 [0.70, 0.80] | - | ||||||
L | 0.63 [0.61, 0.66] | <0.001 | - | |||||
Ca | 0.58 [0.56, 0.60] | <0.001 | <0.001 | <0.001 | - | |||
1P | 0.64 [0.62, 0.67] | <0.001 | 0.45 | <0.001 | - | |||
2P | 0.63 [0.62, 0.67] | <0.001 | 1.00 | <0.001 | 1.00 | - | ||
M | 0.64 [0.61, 0.67] | <0.001 | 1.00 | <0.001 | 1.00 | 1.00 | - |
Location | Thickness | p-Value | B | DB | DP | FIS | I | MB | MP | P | V |
---|---|---|---|---|---|---|---|---|---|---|---|
B | 0.61 [0.56, 0.66] | - | |||||||||
DB | 0.66 [0.61, 0.66] | <0.001 | 0.051 | - | |||||||
DP | 0.66 [0.61, 0.70] | <0.001 | 0.058 | - | |||||||
FIS | 0.75 [0.70, 0.80] | <0.001 | <0.001 | <0.001 | - | ||||||
I | 0.61 [0.61, 0.70] | <0.001 | 1.000 | 0.033 | <0.001 | - | |||||
MB | 0.61 [0.56, 0.66] | 1.0000 | 0.142 | <0.001 | <0.001 | 0.006 | - | ||||
MP | 0.66 [0.61, 0.70] | <0.001 | 0.590 | 1.000 | <0.001 | 0.378 | <0.001 | - | |||
P | 0.66 [0.61, 0.70] | <0.001 | 1.000 | 1.000 | <0.001 | 1.000 | <0.001 | 1.000 | - | ||
V | 0.56 [0.51, 0.66] | 0.002 | <0.001 | <0.001 | <0.001 | <0.001 | 1.000 | <0.001 | <0.001 | - |
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Migliorati, M.; Drago, S.; Lagazzo, A.; Campobasso, A.; Battista, G.; Kerberger, R.; Drescher, D.; Becker, K. Effect of Curing Time and Nitrogen Generator Usage on Direct 3D-Printed Aligners Thicknesses—An In Vitro Micro-CT Study. Appl. Sci. 2023, 13, 11952. https://doi.org/10.3390/app132111952
Migliorati M, Drago S, Lagazzo A, Campobasso A, Battista G, Kerberger R, Drescher D, Becker K. Effect of Curing Time and Nitrogen Generator Usage on Direct 3D-Printed Aligners Thicknesses—An In Vitro Micro-CT Study. Applied Sciences. 2023; 13(21):11952. https://doi.org/10.3390/app132111952
Chicago/Turabian StyleMigliorati, Marco, Sara Drago, Alberto Lagazzo, Alessandra Campobasso, Giovanni Battista, Robert Kerberger, Dieter Drescher, and Kathrin Becker. 2023. "Effect of Curing Time and Nitrogen Generator Usage on Direct 3D-Printed Aligners Thicknesses—An In Vitro Micro-CT Study" Applied Sciences 13, no. 21: 11952. https://doi.org/10.3390/app132111952
APA StyleMigliorati, M., Drago, S., Lagazzo, A., Campobasso, A., Battista, G., Kerberger, R., Drescher, D., & Becker, K. (2023). Effect of Curing Time and Nitrogen Generator Usage on Direct 3D-Printed Aligners Thicknesses—An In Vitro Micro-CT Study. Applied Sciences, 13(21), 11952. https://doi.org/10.3390/app132111952