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RGO.Revista Gaúcha de Odontologia (Online)

versão On-line ISSN 1981-8637

Resumo

DURAO, Ana Reis et al. Sella landmark variability and its effect on the Angles SNA and SNB: a comparative study. RGO, Rev. gaúch. odontol. (Online) [online]. 2016, vol.64, n.3, pp. 263-270. ISSN 1981-8637.

Objective To determine intra- and inter-observer precision in Sella (S), Nasion (N), point A and B identification. Additionally, to determine how it can interfere with angular measurements of SNA and SNB by orthodontists and dentomaxillofacial radiologists. Methods Twenty digital lateral cephalometric radiographs were evaluated by five orthodontists and five dentomaxillofacial radiologists. Results Differences in linear and angular measuremts were assessed. Intra- and inter-observer agreement was evaluated. Intra- and inter-observer reproducibility of the horizontal and vertical components of the S landmark identification (ICC: 0.75/0.90). Orthodontists tended to produce larger SNA (-0.18º), while SNB angle had a tendency to be smaller (0.55º). In general, SNA angle was smaller (DMFRs: -0.308º and orthodontists: -0.092º), and SNB presented with larger values (DMFR: 0.078º and orthodontists: -0.074º). Conclusion Identification of the Sella landmark revealed a better agreement amongst dentomaxillofacial radiologists. Orthodontists, however, showed a larger variability in S identification and, consequently, the SNA and SNB angles drifted significantly.

Palavras-chave : Cephalometry.; Comparative study.; Orthodontics..

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