Biomedical subjects

Conor Armstrong

Publications and source records attributed to Conor Armstrong.

3 recordsLinked to original sources

PubMed2004

Histopathology of the teeth in segmental odontomaxillary dysplasia: new findings.

Histological examination of the deciduous teeth in two cases of segmental odontomaxillary dysplasia (SOMD) showed fibrous enlargement of the pulps, an irregular pulp/dentine interface displaying many pseudoinclusions and pulp stones. There were tubular defects in the coronal dentine from pulp horn to cusp tip, an irregular tubular structure to the circumpulpal dentine of the apical half, a focally deficient odontoblast layer and widespread external resorption. Together with the clinical features of unilateral maxillary enlargement, upper alveolar expansion in the distal segment, increased spacing and delayed eruption of the deciduous molars and absence of premolar teeth, these histological appearances allow distinction of this condition from fibrous dysplasia (FD), segmental hemifacial hypertrophy (SHH) and regional odontodysplasia (ROD).

Alveolar Process↗

PubMed2004

Sarcoidosis with gingival involvement: a case report.

BACKGROUND: The case outlined is a rare presentation of sarcoidosis intraorally associated with gingival ulceration. METHODS: The diagnosis was made following a gingival biopsy. RESULTS: The patient was subsequently referred to a physician for clinical management and the condition resolved without active treatment. CONCLUSIONS: Sarcoidosis should be considered in the differential diagnosis of persistent swellings and ulceration of the oral mucosa. Intraoral sarcoid lesions are often the first indication of systemic involvement. It is important to make the diagnosis and monitor the condition as sarcoidosis is progressive if untreated in a small number of those affected.

Adult↗

PubMed2003

Localizing ectopic maxillary canines--horizontal or vertical parallax?

This study compared the use of horizontal parallax (HP) and vertical parallax (VP) radiography for localizing ectopic maxillary canines (EMCs). The true positions of 43 EMCs were determined using the operative notes and subsequent study models following exposure and eruption. Thirty-four palatal and nine buccal EMCs were included in the study. Six experienced orthodontists examined the radiographs of the EMCs and were asked to localize each EMC using VP and HP on separate occasions. The examiners recorded a diagnosis of 'unsure' in 12 per cent of cases using VP and in 5 per cent of cases using HP. The level of agreement of the diagnoses with the true position of the EMCs was significantly greater for HP. Eighty-three per cent of EMCs were correctly located with HP while only 68 per cent were correctly located with VP (P < 0.05). The diagnostic sensitivity for palatally placed canines was significantly greater for HP (88 per cent) than for VP (69 per cent). Both techniques performed poorly when used to localize buccal EMCs, with HP and VP each having a sensitivity of only 63 per cent. It is concluded that HP is superior to VP in diagnostic accuracy, and that two peri-apical radiographs or one peri-apical and one anterior occlusal radiograph are the radiographs of choice for localizing EMCs.

Adolescent↗