Periodontics · patient case question
What is the likely local factor in Patient A?
Patient case: Four developmental anomalies
Patient: Four patients
Chief Complaint: A: “One back tooth bleeds when I floss.” B: referred for orthodontic assessment. C: mother reports the child's teeth on one side “look different”. D: referred for root canal treatment.
Background: A, 45-year-old male: excellent plaque control, no periodontal disease elsewhere. B, 13-year-old female: no medical history. C, 8-year-old male: unremarkable medical and family history. D, 36-year-old female of East Asian ancestry.
Findings: A: an ISOLATED 8 mm furcation pocket on a molar in an otherwise healthy mouth, with a well-defined radiopaque nodule at the furcation. B: the maxillary canine and first premolar have exchanged positions in the arch. C: several ADJACENT teeth in one quadrant with markedly thin enamel and dentine, disproportionately large pulp chambers and poor contrast, with an abrupt cut-off at the midline. D: mandibular first molar in which the root outline appears unusually wide and the periodontal ligament outlines do not resolve into two roots.
Show answer and explanation
Correct answer: C. An enamel pearl or cervical enamel projection
- A. Condensing osteitis is a sclerotic BONE reaction to low-grade pulpal inflammation. It is not a root-surface anomaly and does not produce a furcation pocket.
- B. Hypercementosis is excessive cementum deposition making the root bulbous, and the periodontal ligament space FOLLOWS the enlarged outline at normal width. It has no periodontal significance and does not cause localised pocketing.
- C. CORRECT. ENAMEL PEARLS are ectopic globules of enamel on the root surface, most often at the furcation of MAXILLARY molars, especially third molars. CERVICAL ENAMEL PROJECTIONS are tongues of enamel extending apically from the cementoenamel junction toward the furcation, most often on MANDIBULAR molars, graded I to III by how far they reach. Both matter for the same reason: PERIODONTAL LIGAMENT AND CONNECTIVE TISSUE CANNOT ATTACH TO ENAMEL — only a weak hemidesmosomal epithelial attachment forms — so these become sites of least resistance where an ISOLATED deep pocket and localised furcation involvement develop in an otherwise healthy periodontium. Localised disease grossly out of proportion to the rest of the mouth is the clinical signature. Management is odontoplasty to remove the projection where it is accessible.
- D. A pulp stone lies WITHIN the pulp chamber and has no relationship to the periodontal attachment at all.
Note: Keep the short list of LOCAL anatomical factors that produce isolated periodontal breakdown: enamel pearls and cervical enamel projections, palatogingival (palatal radicular) grooves on maxillary lateral incisors, root proximity and furcation entrance width, developmental root grooves, and overhanging restorations. When one site is far worse than the rest of the mouth, look for anatomy rather than blaming the patient's hygiene.