glazuur

Glazuur is a Dutch term that refers to two distinct surface coatings or layers: a ceramic glaze applied to pottery and ceramics, and tooth enamel, the hard outer layer of teeth. In ceramics, glazuur is a glassy coating fused to the surface of ceramic objects during a glaze firing. In dentistry, glazuur denotes the enamel surrounding and protecting the teeth.

In ceramics, glazuur consists mainly of silica (silicon dioxide) and various fluxes, plus colorants and stabilizers. The glaze is applied as a liquid slip or slurry and then fused to the ceramic body in a kiln at high temperature. The result is a glassy, often glossy surface that adds color, texture, water resistance, and chemical protection. Glazes can be transparent, opaque, glossy, or matte, and may include crystalline effects for decoration. Common defects include crazing (fine cracks due to thermal expansion mismatch), pinholes, and blistering. Lead-containing glazes were widely used historically but are now restricted due to toxicity; modern glazes are typically lead-free.

In dentistry, glazuur refers to the enamel, the hardest substance in the human body. It is mainly composed of hydroxyapatite crystals and forms a protective, acellular layer over the dentin. Enamel is produced during tooth development by ameloblasts and cannot regenerate after damage. It is highly resistant to mechanical wear and chemical attack, especially when fluoridated, which can form fluorapatite and improve acid resistance. Enamel erosion and attrition result from acids and abrasion and can lead to sensitivity and decay if the underlying dentin is exposed.

Thus, glazuur covers both artificial ceramic surfaces and natural tooth surfaces, each serving protective and functional roles in its respective context.