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學 習 目 標 Introduction Understand buccal object rule Assessment of the impacted maxillary canine tooth position 2. Eric Whaites: Essentials of dental radiography & radiology, 3rd edition, p.7, 8, 113, 279-283 1. White & Pharoah: Oral radiology: principle & interpretation, 5th edition, Chapter 5, p. 91-93 References: Introduction Conclusions
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(1) Buccal Object Rule X :
~2755 1 Introduction Understand buccal object rule
Assessment of the impacted maxillary canine tooth position 2. Eric
Whaites: Essentials of dental radiography & radiology, 3rd
edition, p.7, 8, 113, 1. White & Pharoah: Oral radiology:
principle & interpretation, 5th edition, Chapter 5, p
References: Introduction Conclusions Introduction * Clark [1909,
ref. 1] reported a radiographic procedurefor the localization of
impacted teeth. * Buccal Object Rule (BOR) is a method for
determining the relative location of objects hidden in the oral
region. * Initial concepts of the procedure were reported in 1952
& 1953 [refs. 2, 3] & since that time the procedure has
been developed to its present state of refinement & usefulness.
[1] CLARK C A. A method of ascertaining the relative position of
unerupted teeth by means of film radiographs. Royal Society of
Medicine Transactions 3:87-90, [2] RICHARDS AG. Roentgenographic
localization of the mandibular canal. Journal of Oral Surgery 10: ,
1952. [3] RICHARDS AG. The Buccal object rule. Journal of the
Tennessee State Dental Association 33:263- 268, 1953. Understand
buccal object rule
Lingual Mesial shift Tube shift technique Buccal object rule Clakes
rule (1910) Direct orientation Zygomatic process X-ray beam Buccal
Mesial shift Distal shift Zygomatic process mesial (X-ray beam)
X-ray beam Ref. 1 Assessment of the impacted maxillary canine tooth
position
Parallax in the horizontal plane Parallax in the vertical plane A
vertex occlusal A truePA and lateral skull views (two views at
right angles) *Impacted maxillary canine teeth occur in about 2% of
the population. 1. Parallax in the horizontal plane
Principle of parallax: The apparent displacement of an object due
to different positions of the observer Front Right Left Object
moves in different direction SameLingual OppositeBuccal SLOB () ()
Ref. 2 1. Parallax in the horizontal plane
Position 1- centrally oriented Position 2- distal shift Position 1
Position 2 SameLingual (-palatal side) 11 12 Ref. 2 1. Parallax in
the horizontal plane
12 22 21 22 21 12 11 Choices (1) SameLingual (2) OppositeBuccal ()
() Ref. 2 1. Parallax in the horizontal plane
Choices (1) SameLingual (2) OppositeBuccal () () Apex Crown Ref. 2
2. Parallax in the vertical plane
Panorex Upper occlusal Unerupted mesiodens Crown portion (-palatal
side) (-labial side) SLOB (1) SameLingual (2) OppositeBuccal Apex
portion Ref. 2 3. A vertex occlusal Vertex occlusal Not
recommended
due to high radiation dose Vertex occlusal Ref. 2 Mass of head in a
different position & different shape
4. A true PA and lateral skull views (two views at right angles)
Mass of head in a different position & different shape Similar
images PA view Lateral view Similar images Radiodense object Ref. 2
Conclusion (1) Conclusion (2) Conclusion (3) Summaries Knowing :
Understand Clakes rule
Assessment of the impacted maxillary canine tooth position
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