Intraoal Radiographic Anatomy(口内X线解剖).ppt

g d a e f a = maxillary tuberosity* e = zygoma (dotted lines) b = coronoid process f = maxillary sinus c = hamular process g = sinus recess d = pterygoid plates * image of impacted third molar superimposed c b facial view d b a e c f g Maxillary Tuberosity. The rounded elevation located at the posterior aspect of both sides of the maxilla. Aids in the retention of dentures. facial view Coronoid process. A mandibular structure sometimes seen on the maxillary molar periapical film when using the bisecting angle technique with finger retention (The mouth is opened wide, moving the coronoid down and forward). Note the supernumerary molar. facial view Hamular process (white arrows) and pterygoid plates (purple arrows). The hamular process is an extension of the medial pterygoid plate of the sphenoid bone, positioned just posterior to the maxillary tuberosity. facial view Zygomatic (malar) bone/process/arch. The zygomatic bone (white/black arrows) starts in the anterior aspect with the zygomatic process (blue arrow), which has a U-shape. The zygomatic bone extends posteriorly into the zygomatic arch (green arrow). facial view Maxillary sinus. As seen in the above film, the floor of the maxillary sinus flows around the roots of the maxillary molars and premolars. The walls of the sinus may become very thin. As a result, sinusitis may put pressure on the superior alveolar nerves resulting in apparent tooth pain, even though the tooth is perfectly healthy. Note coronoid process (green arrow), zygomatic bone (blue arrow), sinus septum (yellow arrow) and neurovascular canal (orange arrows). facial view The maxillary sinus is evident anterior to the second molar (black arrows) but it disappears posteriorly due to the superimposition of the zygomatic bone. The orange arrows identify a mucous retention cyst (retention pseudocyst) within the sinus. This film shows the coronoid process (green arrow) and a distomolar (blue arrow) that has erupted ahead of the