Understanding Ankylosed Impacted Maxillary Canines

Managing ankylosed impacted maxillary canines represents a significant clinical challenge for orthodontists and oral surgeons. A recent retrospective study published in BMC Oral Health explored the prevalence and bone characteristics of these teeth. Researchers utilized Cone Beam Computed Tomography (CBCT) to identify radiographic signs that might impede successful tooth movement. Because dental ankylosis involves the fusion of cementum to alveolar bone, it frequently renders conventional orthodontic traction ineffective.

Prevalence and Site Characteristics

The study analyzed 56 CBCT images to detect radiographic signs suggestive of fusion. Researchers discovered that 26.8% of the impacted canines showed indications of ankylosis. Specifically, 8.9% of cases exhibited clear signs, while 17.9% presented possible indicators. Furthermore, these radiographic signs occurred most frequently on the palatal (73.3%) and cervical (60.0%) root surfaces. Consequently, clinicians must prioritize the evaluation of these specific areas during diagnostic imaging for ankylosed impacted maxillary canines.

Bone Density and Diagnostic Indicators

Significantly, the research demonstrated that bone density is markedly higher at sites where ankylosis is suspected. By measuring CBCT grey values, the team found that the surrounding bone quality differed substantially from healthy control sites. Moreover, this increased density serves as a quantitative parameter that helps improve diagnostic confidence. Therefore, assessing the alveolar bone density through 3D imaging allows for more realistic treatment timelines and improved patient communication. Understanding these radiographic markers is essential for avoiding the surgical and orthodontic complications associated with failed tooth eruption.

Frequently Asked Questions

How common is ankylosis in impacted maxillary canines?

According to recent CBCT research, radiographic signs of ankylosis appear in approximately 26.8% of impacted maxillary canines, with nearly 9% showing definitive clear signs of fusion.

Where is ankylosis most likely to occur on the tooth root?

Signs suggestive of ankylosis are most prevalent on the palatal and cervical surfaces of the root. Clinicians should use targeted CBCT slices to inspect these regions thoroughly during treatment planning.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Refer to the latest local and national guidelines for clinical practice.

References

Ong VX et al. Prevalence, extent and surrounding bone density of ankylosed impacted maxillary canines. BMC Oral Health. 2026 Feb 17. doi: 10.1186/s12903-026-07858-x. PMID: 41703552.

Köseoğlu Seçgin C et al. Gray value measurement for the evaluation of local alveolar bone density around impacted maxillary canine teeth using cone beam computed tomography. Med Oral Patol Oral Cir Bucal. 2022;27(1):e1-e7.

Becker A, Chaushu S. Etiology of maxillary canine impaction: a review. Am J Orthod Dentofacial Orthop. 2015;148(4):557-567.