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In Volume 26, No. 1 of The Journal of Prosthetic Dentistry, Dr. Angelo D’Amico begins his influential series on the canine teeth with a detailed exploration of their anatomy, evolution, and foundational role in occlusion. This first article introduces the premise that canines are not simply transitional teeth between incisors and premolars—they are uniquely designed to serve a protective and guiding function in mandibular movement. D’Amico’s early findings laid the foundation for the biologically grounded theory of canine-protected occlusion, which would come to reshape prosthodontic and occlusal philosophy in the decades that followed.
Reevaluating the Role of the Canine Teeth
D’Amico opens the series by challenging prevailing assumptions about the canine teeth, which were often overlooked in restorative planning. He presents the hypothesis that the canine’s anatomic form, root structure, and position suggest a primary functional role in guiding and protecting the masticatory system—not merely contributing to appearance or arch continuity.
This thesis is based on years of occlusal analysis, wear pattern evaluation, and study of natural dentitions. D’Amico proposes that the canines serve as both guides and gatekeepers during excursive movements, minimizing trauma to the posterior teeth and reducing muscle strain.
Anatomical and Structural Distinctions
The article includes a detailed review of canine morphology. D’Amico describes how the canines possess:
- The longest roots in the human dentition
- Thick labial cortical bone for anchorage
- Pronounced crowns with sloped lingual surfaces
- A strategic position at the transition between anterior and posterior segments
These characteristics allow the canines to withstand heavy functional forces, provide proprioceptive feedback, and direct mandibular movement in a controlled manner. The author stresses that no other tooth shares this exact set of biomechanical advantages.
Observational Data and Wear Analysis
Through clinical observation, D’Amico found that patients with intact canine morphology and guidance consistently exhibited minimal wear on their posterior teeth. In contrast, when canine structure was lost or anterior guidance flattened, the posterior teeth began to show significant wear and breakdown. These patterns were consistent across multiple patients and age groups.
His findings suggested that canine teeth play a pivotal role in regulating the direction and magnitude of occlusal forces during function. When canines disclude the posteriors, damaging lateral forces are redirected or avoided entirely.
The Transition to Canine-Guided Occlusion Theory
While D’Amico doesn’t introduce the full canine-protected occlusion concept in this article, he lays the groundwork by highlighting the discrepancy between patients with preserved canines and those without. He questions the validity of group function or flat-plane occlusal theories that disregard the canines’ natural role, asserting that such designs often result in systemic overload and joint dysfunction.
He concludes that clinicians must study the canine teeth not only as static anatomic structures, but as dynamic contributors to function, joint stability, and long-term occlusal integrity.
Future Direction of the Series
D’Amico uses this first article to establish the direction for the remaining papers in the series. He promises to explore histologic findings, occlusal patterns, mandibular dynamics, and restorative implications in subsequent installments. Each piece will build on the theory introduced here: that canine morphology and function are central to the health and stability of the masticatory system.
He encourages readers to adopt a biologic lens when evaluating occlusion—one that respects the natural design and protective capacity of each tooth, especially the canines.
Key Clinical Takeaways
- The canine teeth are structurally and functionally distinct from other teeth, uniquely designed to absorb and guide occlusal forces.
- Canines serve as the primary anterior guidance system, discluding posterior teeth and protecting joints and musculature.
- Clinical observation shows that intact canine function correlates with less posterior wear and better joint health.
- Loss of canine guidance often results in widespread occlusal trauma and dysfunction.
- Future prosthetic and restorative designs should prioritize preservation or reestablishment of canine anatomy and function.
- D’Amico’s early findings challenge traditional occlusal schemes and set the stage for biologically informed treatment planning.
This introductory article sets a strong foundation for Dr. D’Amico’s revolutionary canine series. By drawing attention to the overlooked yet vital role of the canines, it reframes the conversation around occlusion, prompting clinicians to integrate biology, mechanics, and morphology in their restorative philosophy.
Read the full article here.