I now have excellent textbook and anatomical images. Here is the full answer:

Here are the best images available, sourced from authoritative medical textbooks and anatomical references:

This illustration from the Color Atlas of Human Anatomy, Vol. 2 (Fig. 4.9) shows the full dental arcade of the maxilla and mandible. The incisors (labeled 9) and canines (labeled 10) at the front of the arch are the primary single-rooted teeth in humans. Their sockets are small, round, and simple - contrasting with the larger multi-chambered sockets of molars visible at the back:

This classic veterinary anatomy diagram shows a single-rooted incisor/canine (left column) clearly labeled with Crown and Root thirds (Incisal, Middle, Cervical, Apical), compared side-by-side with a multi-rooted molar (right). This is among the clearest labeled depictions available:

This clean clinical diagram shows the internal structure of a single-rooted tooth in cross-section, clearly showing the single root canal, pulp chamber, cementum, bone, periodontal ligament, and apical foramen - the defining feature of single-rooted teeth:

Based on Color Atlas of Human Anatomy, Vol. 2 and Gray's Anatomy for Students:

The canine tooth is anatomically the archetypal single-rooted tooth - it has the longest, strongest single root in the entire dentition, making it a key anchor tooth in restorative dentistry. The incisor root is described as "single, long, and conical." - Color Atlas of Human Anatomy, Vol. 2, p. 267