Radiographic TechniqueCâu 33 / 100
A maxillary premolar image shows teeth that look squat and shorter than normal, with crowns and roots compressed. The most likely cause is:
a.Excessive vertical angulation
b.Insufficient vertical angulation
c.Incorrect horizontal angulation
d.Underexposure of the receptor
Giải thích
Foreshortening, in which teeth appear shortened and compressed, is caused by excessive vertical angulation. Insufficient vertical angulation would produce elongation instead. Horizontal angulation errors cause overlapping of proximal contacts, and underexposure produces a light image without changing tooth length.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which description matches the paralleling technique for intraoral radiography?
- A processed periapical image shows teeth that appear stretched and longer than they actually are. What caused this error?
- A finished radiograph has a clear, unexposed curved area along one border. What is this error called and what causes it?
- On a set of bitewings, the proximal contacts between the premolars are superimposed and cannot be read for caries. What should be corrected on the retake?
- Which vertical angulation is customarily used for a posterior bitewing exposure?
- A patient has a shallow palate and cannot tolerate a paralleling holder, so the bisecting technique is used. Where is the central ray directed?
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