The primary maxillary right canine — designated as tooth C in the Universal Numbering System for primary teeth (tooth 53 in FDI notation) — is the deciduous cuspid located in the upper jaw on the patient’s right side, positioned between the primary lateral incisor and the first primary molar. Like all canines, it features a single prominent cusp designed for tearing and cutting food during mastication.
Role in the Primary Dentition
This tooth typically erupts between 16 and 22 months of age and exfoliates (naturally sheds) between ages 10 and 12, making it one of the last primary teeth to be replaced by its permanent successor. Its extended presence in the arch gives it an outsized influence on developing occlusion and facial structure.
Key functions of the primary maxillary right canine include:
- Guiding lateral jaw movements through canine guidance or group function occlusion
- Supporting the upper lip and surrounding soft tissues, contributing to facial esthetics
- Tearing and cutting food as part of normal mastication
- Maintaining arch length and preserving space for the erupting permanent canine
- Contributing to the establishment of a stable Class I canine relationship in the permanent dentition
Clinical Significance
Premature loss of the primary maxillary right canine — whether caused by caries, trauma, or infection — can trigger mesial drift of adjacent teeth, reducing the space available for the permanent successor and potentially leading to malocclusion or impaction of the permanent canine. Depending on the patient’s age and degree of arch crowding, a space maintainer may be indicated to preserve the arch form.
The long root of this tooth also overlies the crown of the developing permanent canine during the mixed dentition phase. Clinicians rely on periapical and panoramic radiographs to monitor root resorption patterns and verify that the underlying permanent tooth is tracking along a normal eruption path. Any deviation warrants prompt assessment and, if necessary, early orthodontic or surgical intervention.
Preserving the primary maxillary right canine through routine preventive care — including fluoride therapy and timely caries management — is fundamental to protecting arch integrity and ensuring a well-aligned permanent dentition.