Radiology Chapter 35: Trauma and Periapical Lesions Study Material

fractures are most common on ____ teeth

anterior

image permits evaluation of _____

fracture

fractures in root are most often seen in

maxillary incisors

fracture of maxilla appears as a

radiolucent line

maxilla fractures may involve

tooth socket or alveolar bone

mandibular fractures involve

condyle, angle or body

trauma may cause ______ of teeth

displacement

displacement may cause _____ and dental ______

luxation; avulsion

abnormal displacement of teeth

luxation

abnormal displacement of teeth into bone

intrusion

partial avulsion is abnormal displacement of teeth out of bone

extrusion

complete displacement of a tooth from alveolar bone

dental avulsion

process seen with normal shedding of primary teeth

physiologic resorption

regressive alteration of tooth structure when tooth is subjected to abnormal stimuli; external and internal

pathologic resorption

along root periphery at apex of the tooth; root appear blunted; root appears shorter than normal

external resorption

occurs within crown or root of tooth; round-to-ovoid radiolucency; involves pulp chamber, canals, and surrounding dentin

internal resorption

examinations of pulp chambers and canals is impossible without

dental images

conditions seen on dental images

pulpal sclerosis, pulpal obliteration, pulp stones

diffuse calcification of pulp chamber and pulp canals (skinny canals) pulp cavity is reduced in size

pulpal sclerosis

production of secondary dentin may obliterate pulp cavity, no pulp cavity present, discoloration seen clinically

pulpal obliteration

calcifications found in pulp chamber and canals, round oval or cylindrical radiopacities

pulp stones

located around the apex of the tooth

periapical lesions

periapical radiolucencies

granuloma, cyst, abscess

widened PDL at apex of nonvital tooth, localized mass of chronically inflamed granulation tissue

periapical granuloma

radiolucency at apex of nonvital tooth, results from cystic regeneration of periapical granuloma, develops over long period

periapical cyst

localized collection of pus around a non-vital tooth; painful; no change or increased widening of PDL

acute periapical abcess

localized collection of pus around a non-vital tooth; typically asymptomatic; radiolucency at apex

round or ovoid radiolucency at apex

periapical abscess parulis

around apex of nonvital tooth with history of long-standing pulpitis; well-defined radiopacity; most often involves mandibular 1st molar; most common periapical radiopacity observed in adults

condensing osteitis

near apex of vital tooth; well-defined radiopacity; not attached to tooth; unknown cause; asymptomatic

sclerotic bone

radiopaque band around root; excess deposition of cementum; root appears enlarged and bulbous; normal PDL and lamina dura; tooth is vital

hypercementosis