Short answer: A composite filling is a tooth-colored filling material made of resin and glass-like fillers, used to replace tooth structure lost to decay or fracture. It is bonded to the tooth, placed in layers and hardened with a special light. Because of its aesthetic appearance and because it preserves more tooth structure, it is the most commonly used type of filling today.
When a cavity forms in a tooth because of decay or a fracture, the most common treatment is a filling. While silver-colored amalgam fillings used to be widespread, today the first choice in dentistry is often a tooth-colored, aesthetic filling. A composite filling, popularly known as a "white filling", is a treatment that bonds to the tooth and restores both its appearance and its function. When placed correctly and well cared for, it can last for many years.
In this article we explain what a composite filling is, how it differs from amalgam and porcelain restorations, the steps of the procedure, how long it lasts and what to pay attention to in order to extend its life.
What is a composite filling?
A composite filling is a tooth-colored restorative material made of a resin-based matrix with very small glass or ceramic-like filler particles added to it. It is placed in a paste-like consistency and turns solid when hardened with a blue light.
The most important feature of a composite filling is that it bonds to the tooth with adhesive systems. This means there is no need to drill extra cavities in the tooth to hold the filling mechanically; only the decayed tissue is removed and sound tooth structure is preserved as much as possible. This approach is also the basis of the "minimally invasive" treatment philosophy in dentistry.
The main situations in which composite fillings are used are:
- Small and medium-sized cavities in front and back teeth
- Broken or cracked tooth edges
- Wear at the neck of the tooth
- Closing small gaps or correcting the shape of front teeth
- Replacing old, discolored fillings
How does it differ from amalgam and porcelain?
Compared with amalgam, a composite filling is more aesthetic and preserves more tooth structure; compared with porcelain restorations, it can usually be done in a single session with less tooth reduction. Each material has its own area of use.
Comparison with amalgam fillings
- Appearance: Amalgam is silver-gray; composite matches the color of the tooth.
- Tooth structure: Because amalgam does not bond to the tooth, it may require more drilling for retention. Because composite bonds, it allows a more conservative approach.
- Current status: For environmental reasons, international decisions have been made to reduce the use of amalgam, and its use is increasingly restricted in many countries.
If you have sound amalgam fillings that cause no problems, replacing them just for appearance is generally not recommended. The decision to replace them is made together with your dentist based on the condition of the filling.
Comparison with porcelain inlays and onlays
If a tooth has lost a lot of structure, indirect restorations such as porcelain inlays and onlays, made in a laboratory or with digital systems, may be more suitable. These restorations are more resistant to wear and staining. On the other hand, they generally require more than one session and more tooth preparation. For small and medium-sized cavities, a composite filling is often a sufficient and more conservative option.
What are the steps of the procedure?
A composite filling is usually completed in a single session, under local anesthesia and in a few basic steps. The duration depends on the size of the cavity and the position of the tooth.
- Examination and X-ray: The depth of the decay and its proximity to the nerve are evaluated.
- Anesthesia: The area is numbed when considered necessary.
- Shade selection: The filling shade is chosen to match the natural tooth color before the tooth dries out.
- Removing the decay: Decayed tissue is removed and sound tooth structure is preserved.
- Isolation: For the filling to bond well to the tooth, the area must be kept dry and protected from saliva. Cotton rolls or a rubber sheet (rubber dam) can be used for this.
- Surface preparation and bonding agent: The tooth surface is prepared with acid, a bonding agent is applied and hardened with light.
- Layered placement: The composite material is placed in thin layers, and each layer is hardened with light. This method reduces the negative effects of the material shrinking as it hardens.
- Shaping and polishing: The filling is shaped to match the tooth's natural anatomy, the bite is checked and the surface is polished.
Because it is hardened with light, a composite filling is already set when the procedure is finished. Not eating until the numbness wears off is recommended to avoid biting your lip or cheek.
How long does a composite filling last?
In studies and clinical experience, composite fillings can in most cases be used without problems for many years; however, it is not accurate to give a single figure, because their lifespan depends on many factors. Small, well-cared-for fillings generally last longer than large fillings that bear heavy chewing loads.
The main factors affecting the lifespan of a composite filling are:
- Size of the filling: Fillings that cover a large part of the tooth are exposed to more load.
- Location: Fillings in back teeth bear chewing forces more intensely.
- Decay risk: New decay developing at the filling margins is one of the most common reasons for replacing fillings.
- Habits: Clenching, grinding, nail biting and cracking hard objects with your teeth wear down fillings.
- Placement conditions: Good isolation and correct technique affect how well the filling bonds to the tooth.
As a filling nears the end of its life, signs such as staining or roughness at the margins, food getting caught or sensitivity may appear. Having a check-up when you notice these signs allows small problems to be solved before they grow.
Is there sensitivity after a filling?
Mild sensitivity to hot and cold lasting from a few days to a few weeks may occur after a composite filling, and it usually eases on its own. Sensitivity may be more noticeable especially with deep cavities, because the work is done close to the nerve.
If it hurts when you bite, the filling may be sitting high in the bite; this is corrected with a simple adjustment. If sensitivity keeps increasing, spontaneous throbbing pain starts or pain wakes you up at night, you should see a dentist. Such symptoms may indicate that the nerve is affected and that further treatment is needed.
How do you care for it?
Caring for a composite filling is the same as caring for natural teeth: regular brushing, cleaning between the teeth and periodic check-ups extend the life of the filling. The filling itself does not decay, but the tooth structure at its margins can.
- Brush twice a day with fluoride toothpaste.
- Clean the filling margins too, with floss or an interdental brush.
- Tea, coffee, cola and smoking can stain the composite surface over time; limiting them and rinsing your mouth with water afterward helps.
- Avoid cracking hard shells, ice or objects such as pens with your teeth.
- If you have a clenching habit, consult your dentist; a night guard may be recommended.
- At check-ups, the filling surface can be repolished when needed to maintain its shine and smoothness.
For frequently asked questions about fillings and other preventive treatments, take a look at our frequently asked questions page.
Filling examination in Ankara
If you have noticed sensitivity to hot and cold, food getting caught, discoloration or a broken edge on your teeth, it is a good idea to plan an examination so the decay can be treated before it grows. At our polyclinic in Park Oran Ofis in Oran, Çankaya, your teeth are evaluated, and if a filling is needed, the suitable material and method are discussed with you.
Frequently asked questions
Are a composite filling and a white filling the same thing?
Yes, when people say white filling they generally mean a composite filling. It gets this name because it matches the color of the tooth. There are other tooth-colored filling materials such as glass ionomer, but composite is the most widely used.
When can I eat after a composite filling?
Because a composite filling is hardened with light, it is already set when the procedure ends. However, if anesthesia was used, it is recommended not to eat until the numbness wears off; otherwise you might bite your lip or cheek.
Should I replace my old amalgam fillings with composite?
Replacing sound amalgam fillings that cause no problems only for appearance is generally not recommended, because some tooth structure is lost with every replacement. If a filling has a fracture, decay or leakage, replacement is planned together with your dentist.
Does a composite filling change color?
Over time, slight staining may occur on the filling surface due to factors such as tea, coffee and smoking. At regular check-ups, this staining can often be reduced by polishing the filling surface. If there is significant discoloration, the filling may need to be replaced.
