VALIDITY OF SNA AND SNB IN SAGITAL JAW ASSESSMENT

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SAFAVI M.R.; GOUDARZI B.

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Journal: Journal of Dental School Year:2003 | Volume:20 | Issue:4 Page(s): 600-607

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Information Journal Paper

Title

VALIDITY OF SNA AND SNB IN SAGITAL JAW ASSESSMENT

Author(s)

SAFAVI M.R. | GOUDARZI B. | Issue Writer Certificate

Keywords

SNAQ4

SNBQ4

SAGITTAL JAW ASSESS~ENT.Q4

Abstract

Aim: The purpose of this study was to evaluate the diagnostic value of SNA and SNB in sagittaljaw assessment. SNA and SNB are the most popular measurements utilized for sagittal jaw assessment. Validity of these measurements are affected by different factorssuch as anteroposterior position of Sella and Nasion as well as age, sex, and geometric factors so that validity reported for these measurement are between 46-80%. Materials -ond Method: Pretreatment lateral cephalogram and photographs and dental casts of 117 orthodontic patients selected randomly ITom the archieve of Shahid Beheshti University. Diagnosis of 5 orthodontist with interobserver reliabillty of 79% using all informationexcept SNA and SNB used as gold standard and compared to SNA and SNB by reporting sensitivity, specificity, positive predictive value, negative predictive value and accuracy as well as ROC analysis. Results: Sensitivity and specificity of SNA in diagnosis of maxillary prognathsm and retrognathsm was 11.1% and 91.90% and 50%, 66.7% respectively. For SNB it was better (28.6% and 96.9%) and (spe. 70.4 and 69.8%) respectively. The area, under ROC curve also confermed the same information. Conclusion: SNB showed much better than SNA specially in mandibular prognatism. Using the best cut-off point also ,improve validity of measurement. Corrected SNA and SNB using 6° SN validity also improve validity specially for SBN.

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APA: Copy

SAFAVI, M.R., & GOUDARZI, B.. (2003). VALIDITY OF SNA AND SNB IN SAGITAL JAW ASSESSMENT. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, 20(4), 600-607. SID. https://sid.ir/paper/22109/en

Vancouver: Copy

SAFAVI M.R., GOUDARZI B.. VALIDITY OF SNA AND SNB IN SAGITAL JAW ASSESSMENT. JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE[Internet]. 2003;20(4):600-607. Available from: https://sid.ir/paper/22109/en

IEEE: Copy

M.R. SAFAVI, and B. GOUDARZI, “VALIDITY OF SNA AND SNB IN SAGITAL JAW ASSESSMENT,” JOURNAL OF DENTAL SCHOOL SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCE, vol. 20, no. 4, pp. 600–607, 2003, [Online]. Available: https://sid.ir/paper/22109/en

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