What is a key characteristic of hypophosphatasia related to primary teeth?

• A. Delayed eruption of primary molars
• B. Premature loss is common
• C. Incisor malformation
• D. Extensive caries

Answer: (B)

Hypophosphatasia is a genetic disorder characterized by a deficiency of the enzyme alkaline phosphatase, which plays a critical role in mineralization of bones and teeth. In the context of primary teeth, a key characteristic of hypophosphatasia is the premature loss of these teeth. This condition affects the normal development and strength of the dental tissues, leading to reduced mineralization and structural integrity, particularly in the primary dentition.

Due to this deficiency, primary teeth may become loose and fall out earlier than expected, often without significant dental disease present. This contrasts with more typical scenarios where loss of primary teeth occurs naturally due to normal eruption patterns and the growth of permanent teeth.

The other characteristics, while relevant to dental health, do not specifically highlight the unique aspect of hypophosphatasia as prominently as the premature loss of primary teeth does. Delayed eruption can occur in various conditions, incisor malformation is related but not as universally prevalent in all cases of hypophosphatasia, and extensive caries is not directly attributable to the condition itself. Hence, the aspect of premature loss makes it the defining feature associated with hypophosphatasia in young children.