Which dental filling material is best?

Many people enjoy consuming sweets in daily life and often neglect oral hygiene—failing to brush their teeth regularly—which can lead to dental caries (tooth decay). Untreated caries not only compromise the aesthetic appearance of teeth but may also cause inflammation. Additionally, food debris can accumulate between teeth, resulting in halitosis (bad breath). Therefore, prompt restorative treatment (i.e., dental fillings) is essential for managing caries. Several filling materials are available—including amalgam, zinc oxide eugenol cement, glass ionomer cement, and porcelain crowns—each with distinct advantages and limitations. Among these, porcelain crowns offer superior aesthetics and biocompatibility; however, they tend to be comparatively more expensive.

Which Dental Filling Material Is Best?

Principle for Selecting Dental Filling Materials: The goal is not necessarily to choose the “best” material, but rather the most appropriate one for the specific clinical situation. To make an informed decision, it is first necessary to understand the main categories of available dental restorative materials.

Common Dental Filling Materials:

Dental Amalgam: A permanent restorative material composed of a mixture of silver-based alloy powder and elemental mercury, prepared at room temperature.

Zinc Oxide Eugenol Cement: Easily removable; contains eugenol, which exerts soothing, analgesic, and pulp-protective effects. Zinc Phosphate Cement: Composed of zinc phosphate powder mixed with phosphoric acid liquid.

Glass Ionomer Cement: Color-matched to natural tooth structure, with high compressive strength, excellent adhesion to tooth tissues, and minimal pulp irritation. Commonly used for cavity lining and anterior restorations.

Composite Resin: Consists of a polymer resin matrix reinforced with inorganic filler particles; widely employed for restoring anterior teeth and cervical lesions.

Dental amalgam is highly durable and mechanically stable. As a permanent restorative material, its mechanical properties closely resemble those of natural dentin, minimizing differential wear between the restoration and adjacent tooth structure—making it a historically preferred choice for posterior restorations. However, amalgam lacks adhesive properties; therefore, extensive cavity preparation (i.e., removal of healthy tooth structure) is required to achieve adequate mechanical retention. Despite its excellent physical properties, a major drawback of amalgam is its metallic gray color, which compromises esthetics.

Cements (e.g., zinc oxide eugenol, zinc phosphate) are primarily used for temporary restorations. These materials consist of metal salt or oxide powders combined with liquid components to form viscous pastes. Due to relatively low mechanical strength and susceptibility to dissolution upon prolonged contact with saliva or water, cements are generally unsuitable for long-term or permanent restorations. Glass ionomer cement is an exception: it exhibits higher strength than conventional cements and releases fluoride ions, conferring caries-preventive benefits—hence its widespread use in pediatric dentistry for restoring primary teeth.

Composite resins offer excellent esthetics. Key advantages include natural tooth-like color, insolubility in saliva, favorable mechanical properties, and strong bonding to tooth structure. Historically, early-generation composite resins exhibited suboptimal wear resistance, limiting their use mainly to anterior and cervical restorations. However, modern, high-strength composite resins now demonstrate sufficient durability for posterior restorations—and are increasingly replacing amalgam in many clinical settings.

Composite resin is generally considered the optimal choice for most restorative procedures, primarily because its shade closely matches natural tooth color, it is relatively stable over time, and it elicits minimal pulpal irritation. Its principal limitation remains lower wear resistance compared with amalgam or ceramics. Thus, patients should select a restorative material best suited to their individual clinical needs, functional requirements, and aesthetic expectations.

We hope this information has been helpful. Wishing you good health and happiness!