Ⅰ A list of many types of dental 3D printing materials
Photopolymer resin is the main material used in dental 3D printing. Metal powder and a small amount of ceramic composite materials are added to it. Based on its uses, it can be put into the following groups:
1. Resin for dental models
Usage: Used to make models for orthodontics, working, and dental procedures, among other things.
What it has:
Very accurate and stable in size
quick printing speed
Easy to treat after posting, smooth surface
Safety: It is mostly used for oral models and doesn't touch the mouth directly, thus the biocompatibility requirements are low. But you should use resins that meet dental requirements.
2. Resin for Implant Surgical Guides
Purpose: To make guides for planting and to help with the placement and angle control of implants.
Things to know:
High accuracy and stiffness make sure that surgery is done in the right place.
It can be cleaned, is resistant to high temperatures and UV light, and
Safety: The guide plate needs to be certified as Class I/Class II biocompatible since it may come into contact with the mouth for a short time and could irritate soft tissues.
3. Temporary Crown and Bridge Resin
Use: Printing temporary dental crowns and bridges for patients who are going through treatment.
Features:
Strong and tough, and can handle pressure from bites.
Good adherence and a smooth surface
It can be cured again after printing to make it more stable.
Safety: It needs to meet biocompatibility standards (ISO 10993, FDA/CE certification) to make sure it is safe for short-term use in the mouth.
4. Resin for Denture Base
Usage: This is the base section of full mouth or partial detachable dentures.
Features:
Has a nice fit and some give.
Stable size that doesn't change shape easily
Can be worked on twice, like trimming and polishing
Safety: Direct contact with oral mucosa must pass stringent biocompatibility testing.
5. Align Resin for clear orthodontic appliances
Purpose: To print models of invisible orthodontic appliances or to produce orthodontic appliances directly.
Characteristics:
Very precise, thin layers
Stability of size following photopolymerization
The surface is smooth and easy to polish.
Safety: If you print orthodontic equipment directly, they need to fulfill long-term oral contact criteria. If you merely print the model, the requirement for biocompatibility is lower.
6. Composite materials made of metal and ceramic
Some dental applications also use metal or ceramic 3D printing technologies in addition to photopolymerization resin:
Printed with SLM/DMLS technology, metal powder is utilized for dental crowns, bridges, titanium alloy implants, and more.
Strong and resistant to wear
Must meet biocompatibility standards
Ceramic powder is used to make porcelain veneers and attractive dental crowns. After printing, it needs to be sintered.
A smooth surface and hue that is close to that of real teeth
Strong and resistant to wear
These materials are usually utilized for permanent restorations and have the strictest safety standards.
Ⅱ Analyzing the safety of materials used in 3D printing for teeth
1. Certification of biocompatibility
The safety of dental products is mostly based on international standard certification:
ISO 10993 series: Tests for biocompatibility of dental materials, such as cytotoxicity, skin irritation, and interaction with the oral mucosa.
FDA/CE certification: Make sure that the materials can be used in medical devices that go in the mouth.
Class I/Class II classification: Set safety requirements based on how long and where the product comes into contact with people.
In short, you must utilize materials that have passed biocompatibility certification when printing dental products that will be used in the mouth. Don't use regular industrial resins or materials that haven't been certified to print portions that touch the mouth directly.
2. Secondary cure and treatment after
After the photosensitive resin printing is done, it usually needs to be cured again:
Using heat or UV light to speed up the polymerization of resin
Make the mechanical performance and dimensional stability better
Make uncured monomers less irritating to the mouth.
Also, the printed parts need to be cleaned and any leftover resin needs to be taken off for safety reasons.
3. The distinction between short-term and long-term contact with the mouth
Short-term exposure (temporary dental crowns, implant guides): The material needs to be strong enough to hold up under pressure, resistant to wear, and not cause irritation.
Long-term contact (denture base, permanent dental crown) necessitates enhanced biocompatibility and chemical stability to guarantee non-toxicity and safety for prolonged usage.
4. Checking the quality of the materials
High-quality materials for 3D printing teeth usually have:
Traceable batch number
Raw materials with a high level of purity
Works well with a lot of different types of equipment
Stable performance settings
Using bad materials can lead to:
The accuracy of printing does not reach the norm.
Parts that are molded are likely to crack easily.
Possible discomfort or allergy in the mouth
Ⅲ Suggestions for choosing dental materials
A clear goal
Each sort of model, guide, temporary restoration, or denture needs various materials.
Choose materials for certification
Use materials that have been certified by ISO 10993, the FDA, or CE first.
Type of printer that matches
SLA, DLP, and LCD printers are sensitive to resin optical properties and need to employ materials that work with them.
Think on what to do after processing
Cleaning, secondary curing, polishing, and disinfecting are all vital tasks to make sure everything is safe.
Concentrate on long-term stability
For parts that will be used for a long time, such dentures or long-term dental crowns, you should choose high-performance resins or metals.
