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Addressing Typical Challenges in Dental UV 3D Printing (Part 6)

Release time:

2026-08-19 06:56

Addressing Typical Challenges in Dental UV 3D Printing (Part 6)

Material stability and discoloration are critical issues in dental UV‑3D printing that affect the long-term performance of restorations. The chemical composition of photopolymer resins determines their resistance to discoloration, while improper storage conditions can accelerate aging. Additionally, printed parts may undergo shrinkage and deformation over time, both of which directly compromise the esthetics and fit of the restoration in the patient’s mouth. Addressing material stability and discoloration requires a multifaceted approach, encompassing resin storage management, post‑printing aging control, and careful formulation selection.

I. Standardized Management of Resin Storage Conditions

Photosensitive resin is sensitive to ultraviolet light and heat, and improper storage conditions can accelerate its aging process. Prolonged exposure to high temperatures or direct sunlight may lead to slow pre‑polymerization, resulting in changes in viscosity and a decline in print performance. Resin should be stored sealed in a dark, cool environment to prevent accelerated degradation from heat and UV exposure. It is recommended to keep the resin at an appropriate temperature and to reseal it promptly after use to minimize air contact. For opened but partially used resin, consider covering the bottle opening with an inert gas before resealing.

II. Control of the Storage Duration of Printed Documents

Printed parts may undergo shrinkage and deformation as storage time increases. After printing, photopolymer resins can still contain residual reactive groups that have not fully polymerized; over time, these groups continue to undergo slow crosslinking reactions, leading to further volumetric shrinkage. The directional displacement of implant abutments aligns with the contraction direction of the model, and both three-dimensional and angular deviations increase significantly with prolonged storage. The deterioration of dimensional stability directly compromises the fit between the restoration and the model.

Remake fabrication and clinical placement should be completed as soon as possible after model printing to prevent accuracy loss due to prolonged storage. For models requiring short-term storage, it is recommended to complete remake fabrication within 2–3 days of printing; for models intended for long-term storage, consider using sealed packaging to mitigate the effects of ambient humidity.

III. Prevention of Color-Change Risks

Some resin formulations may exhibit color changes after curing or during long-term storage, which can be attributed to residual photoinitiators, resin oxidation, or secondary reactions involving unreacted monomers. In applications with stringent requirements for color stability, such as anterior aesthetic restorations, resin discoloration can result in a mismatch between the restoration and the adjacent teeth.

During the material selection phase, resin systems with superior yellowing resistance should be prioritized. Aliphatic polyurethane acrylate systems generally exhibit excellent yellowing resistance and are well suited for anterior esthetic restorations. Resins from different brands and formulations may vary in color stability; therefore, it is advisable to compare their discoloration tendencies through accelerated aging tests. At this stage, refer to the color‑stability data provided in the material datasheets, and in clinical practice, periodically assess the color changes of the restorations.

IV. Conclusion

Addressing material stability and discoloration requires a comprehensive approach that integrates resin storage management, control of print‑part storage duration, and proactive prevention of discoloration risks. Resin should be stored in a sealed container under light‑protected, low‑temperature conditions; printed parts should be clinically placed as soon as possible to minimize loss of accuracy; and formulation selection must prioritize resistance to discoloration to ensure optimal esthetic outcomes. Implementing these measures calls for establishing standardized protocols across multiple stages—material handling, post‑printing processing, and clinical scheduling—to collectively safeguard the aesthetic quality and biocompatibility of dental UV‑cured 3D‑printed restorations.

Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.

Bossin Related Product Recommendations – 3D Printing
Dentistry
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-100M	Bisphenol A epoxy acrylate	Low viscosity, high hardness, high gloss, and high body.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA.
B-276H	Aliphatic polyurethane acrylate	High hardness, fast curing, excellent toughness, and low yellowing.
B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, impact resistance
B-296M	Polyurethane acrylate	Fast curing, resistant to polar solvents, yellowing-resistant, and impact-resistant.
B-301	Aromatic polyurethane acrylate	Fast curing, excellent toughness, and good sandability.
B-302	Aromatic polyurethane acrylate	Fast curing, high strength, excellent toughness, and good grindability.
B-368	Aliphatic polyurethane acrylate	Good toughness, excellent leveling, excellent bend resistance, and excellent heat resistance.
B-376	Aliphatic polyurethane acrylate	LED yellowing is minimal, and the nail polish formulation exhibits excellent stability.
B-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch resistance, and chemical resistance.
B-79D	Polyester acrylate	High hardness, low yellowing, and high evaporation efficiency at elevated temperatures.
Monomer Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM1211 (HPMA)	Hydroxypropyl methacrylate	HEMA-free, high strength, low irritation, and high adhesion
BM2223 (TPGDA)	Dipropylene glycol diacrylate	Good flexibility and low volatility
BM3231 (TMPTA)	Trimethylolpropane triacrylate	High crosslink density, high hardness, high gloss, and excellent wear resistance.
BM3235 (PET3A)	Pentaerythritol triacrylate	Fast curing, high crosslink density, high hardness, and excellent chemical resistance.
BM3380 (3EO-TMPTA)	Pentaerythritol triacrylate	More flexible and less irritating than TMPTA.

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Addressing Typical Challenges in Dental UV 3D Printing (Part 7)

Addressing Typical Challenges in Dental UV 3D Printing (Part 5)