Analysis of the residual monomer content in milled and 3D-printed removable CAD-CAM complete dentures: an in vitro study

Srinivasan, Murali; Chien, Edward Chaoho; Kalberer, Nicole; Alambiaga-Caravaca, Adrián M.; Castelleno, Alicia López; Kamnoedboon, Porawit; Sauro, Salvatore; Özcan, Mutlu; Müller, Frauke; Wismeijer, Daniël

doi:10.1016/j.jdent.2022.104094

Cited by 14 publications

(10 citation statements)

References 34 publications

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“…However, incomplete polymeri-zation can occur, resulting in residual monomer retention, which leads to increased water absorption and decreased mechanical properties. 28 In this study, the duration and rinsing technique had a significant impact on the hardness value of a 3D-printed denture base. The amount of residual monomer can be decreased by extending the washing protocol, as described in a previous study.…”

Section: Discussionmentioning

confidence: 78%

“…This was likely due to solvent molecules diffusing into the polymer network, causing surface swelling. 7,28 There was a significant difference in mean Sa scores between the three methods. Multiple comparison analyses showed that at 15 minutes of rinsing time, the ultrasonic method had the lowest Sa score (1.44 AE 0.18 μm), followed by the hand washing (1.54 AE 0.26 μm) and automated methods (1.77 AE 0.35 μm).…”

Section: Discussionmentioning

confidence: 90%

“…The amount of residual monomer can be decreased by extending the washing protocol, as described in a previous study. 28 In addition, a positive correlation between surface hardness and DC has been reported. 37 Although the postrinsing time of automated method for clear photopolymer resin, as per recommendation from the manufacturer, is 10 minutes, the results of this study show that the automated method at 15-minute rinsing times had higher surface hardness (13.66 AE 1.23 kgf/mm 2 ) than 10 minutes (12.53 AE 0.64 kgf/mm 2 ).…”

Section: Discussionmentioning

confidence: 95%

“…This was likely due to solvent molecules diffusing into the polymer network, causing surface swelling. 7 28…”

Section: Discussionmentioning

confidence: 99%

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Effect of Postrinsing Times and Methods on Surface Roughness, Hardness, and Polymerization of 3D-Printed Photopolymer Resin

Katheng,

Prawatvatchara,

Tonprasong

et al. 2024

Eur J Dent

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Objectives This in vitro study investigated the effects of different postrinsing times and methods on the surface roughness, surface hardness, and degree of polymerization of materials manufactured via stereolithography (SLA). Materials and Methods A total of 288 disk-shaped specimens were manufactured using an SLA three-dimensional (3D) printer. The specimens were randomly divided into nine groups (n = 32) based on rinsing times and methods. The groups were categorized into three rinsing methods: automated, ultrasonic, and hand washing, with rinsing times of 5, 10, and 15 minutes using a 99% isopropanol alcohol as a solvent. Linear roughness (Ra) and area roughness (Sa) were measured using a 3D confocal laser microscopy; the roughness morphology was evaluated by using scanning electron microscopy. Vickers hardness (VHN) tests were performed using a Vickers microhardness tester. Fourier-transform infrared spectrometry was used to determine the degree of conversion of treated specimens. Statistical Analysis Data were statistically analyzed using two-way analysis of variance. The post hoc Tukey tests were conducted to compare the differences between groups (p < 0.05). Results The choice of the rinsing time and method affected the surface properties of the SLA photopolymer resin. The 15 minutes of ultrasonic method exhibited the highest Ra scores (0.86 ± 0.1 µm), while the 15 minutes of automated method presented the highest Sa scores (1.77 ± 0.35 µm). For the VHN test, the 15 minutes of ultrasonic method displayed the highest VHN score (18.26 ± 1.03 kgf/mm2). For the degree of polymerization, the 15 minutes of automated method was initially identified as the most effective (87.22 ± 6.80). Conclusion To facilitate the overall surface roughness, surface hardness, and degree of polymerization, the optimal choice of postprocessing rinsing time and method for achieving a clear photopolymer resin was determined to be the ultrasonic method with a rinsing time of 15 minutes.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 95%

“…This was likely due to solvent molecules diffusing into the polymer network, causing surface swelling. 7 28…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Postrinsing Times and Methods on Surface Roughness, Hardness, and Polymerization of 3D-Printed Photopolymer Resin

Katheng,

Prawatvatchara,

Tonprasong

et al. 2024

Eur J Dent

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“…Here, liquid resin is injected directly into the model, and hence, the fit should be even more precise. In addition, it was shown that methylmethacrylate concentrations are significantly lower in 3D-printed removable complete dentures than in the milled ones [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

Misfit of Complete Maxillary Dentures’ Posterior Palatal Seal following Polymerisation with Four Different Autopolymerising Resins: An In Vitro Study

Schiller¹,

Rustemeier

Kraus

et al. 2022

Materials

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Background: The majority of complete dentures are still conventionally manufactured using a flask-and-pack technique. However, the polymerization process may introduce a distortion of the denture body. The aim of this study was to evaluate the three-dimensional fit of the posterior palatal seal of maxillary complete dentures with the original impression, and to give recommendations for scraping. Methods: Four autopolymerising resins were used to manufacture 40 palatal plates each for high, medium and flat palates (total n = 120). The misfit was captured by taking a reline impression with a highly fluid silicone, the dimensions of which were measured with a flat-bed scanner. Results: The shape of the palate had a significant impact (median p = 0.0435), but not the resin type (median p = 0.2575). It was largest for the flat palate and smallest for the high palate. The largest misfit was observed in the palatal midline area (flat-palate average median: 685 µm; high and medium palates: 620 µm) decreasing towards the lateral and anterior regions. Conclusions: The results suggest compensating for the palatal misfit that occurs with autopolymerising resins by scraping a postdam of an approximately 0.7 mm depth to the master cast, decreasing towards the anterior and lateral areas. In high and medium palates, the scraping could be less pronounced.

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The state of additive manufacturing in dental research – A systematic scoping review of 2012–2022

Çelik

Koç

Kuştarcı

et al. 2023

Heliyon

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Analysis of the residual monomer content in milled and 3D-printed removable CAD-CAM complete dentures: an in vitro study

Cited by 14 publications

References 34 publications

Effect of Postrinsing Times and Methods on Surface Roughness, Hardness, and Polymerization of 3D-Printed Photopolymer Resin

Effect of Postrinsing Times and Methods on Surface Roughness, Hardness, and Polymerization of 3D-Printed Photopolymer Resin

Misfit of Complete Maxillary Dentures’ Posterior Palatal Seal following Polymerisation with Four Different Autopolymerising Resins: An In Vitro Study

The state of additive manufacturing in dental research – A systematic scoping review of 2012–2022

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