OBJECT LOCALISATIONOBJECT LOCALISATION

Localization byLocalization byRadiographic TechniquesRadiographic Techniques

WHY?WHY?

Foreign bodies Impacted, unerupted teeth Supernumerary teeth Broken needles Retained roots Fractures of maxillofacial structures Soft tissue calcifications Intra-osseous tumors Calculi in gland/duct of gland Filling materials in alveolar process

TechniquesTechniques

Miller’s Technique/ Right angle Technique

Clark’s Technique/ Tube-shift Technique

MillerMiller’’s Techniques Technique

Usually Indicated for Mandibular Third molar area

Two radiographs made are positioned at right angles to each other

LOCALIZES in 3 Dimensions

DISADVANTAGES Can be used in maxilla but not that useful

like in mandible due to superimpositions

FISSURE BUR

FOREIGN BODY

WATERS VIEW LATERAL VIEW

INTRA OSSEOUS TUMOURS

Occlusal viewLateral view

Lateral oblique

Occlusal view

ClarkClark’’s rules rule

Tube shift technique , C.A. Clark

PRINCIPLE

Relative positions of radiographic images of two separate objects changes ,when projection angle at which images were made, is changed

The image of Tooth that is farther away from X-

ray tube(lingual) moves in same direction as

tube and Image of Tooth closer to X-ray tube

(Buccal) moves in opposite direction

SLOBSLOB

Lingual body moves in same direction SLOBSLOB

Buccal body moves in opposite direction

SLOBSLOB

SAME LINGUAL OPPOSITE BUCCAL