Final answer:
Primary mandibular canines are present without premolars in the primary anterior dentition. In the primary dentition, only incisors, canines, and molars are present, as premolars appear later with the development of permanent teeth.
Step-by-step explanation:
Primary mandibular canines are present in the primary anterior dentition without premolars. The primary anterior dentition typically includes incisors, canines, and molars. In the human mouth, the incisors are the sharp front teeth used for biting into food, the canines (or cuspids) flank the incisors and are pointed for tearing food, and the molars are used for crushing food. Premolars, also known as bicuspids, are the teeth located between the canines and molars with a flat shape used for mashing food. These are not present in the primary dentition as they only appear during the development of permanent teeth.
Mammals are diphyodonts, which means they have two sets of teeth during their lifetime: deciduous (primary) teeth and permanent teeth. The primary set does not include premolars, but instead, has a simpler organization meant to serve the needs of a developing child.