2. CAREY'S ANALYSIS AND LUNDSTROM ANALYSISBy Dr. Tony Pious 1St
yr orthodontics 3. CONTENTS INTRODUCTION TO MODEL ANALYSISCAREY'S
ANALYSIS -INTRODUCTION -PROCEDURE -INFERENCELUNDSTROM ANALYSIS 4.
MODEL ANALYSIS Model analysis is the study of dental casts, which
helps to study the occlusion & dentition from all three
dimensions & analyze the degree & severity of malocclusion
& to derive the diagnosis & plan for treatment. 5. CAREY'S
ANALYSIS The question of reduction of tooth structure as a
treatment procedure in orthodontics has been a controversial one.
The decision to extract must be preceeded by a great deal of
thought and study. Esthetics is also an important consideration. 6.
Many malocclusions occur as a result of discrepancy between arch
length and tooth material. Arch perimeter analysis helps in
determining the extend of this discrepancy in maxillary arch. Same
method on the upper arch is called ' ARCH PERIMETER 'Analysis
method. 7. Arch length anterior to first permanent molar is
measured by using a soft brass wire. The wire is placed touching
the mesial surface of the first permanent molar and is passed over
the buccal cusps of premolar and along the anterior and is
continued on the opposite side. 8. In case of proclined anteriors
the wire passed along the cingulum of anterior teeth. And in
retroclined anterior it passes along the labial to the teeth. 9.
Determination of tooth material 10. INFERECE If discrepancy is
0-2.5 mm minimal tooth material excess,proximal reduction can be
carried out 2.5 5 mm need to extract second PM > 5 mm need to
extract the first PM 11. LUNDSTROM SEGMENTAL ANALYSIS Segmental
analysis involves an indirect assessment of dental arch perimeter.
The dental arch is divided into six straight line segments of two
teeth per segment, including first permanent molars, the record the
mesiodental width of the teeth and sum them for each segment and
add them up for net discrepancy. 12. DISCREPANCY CALCULATION The
difference between the actual and ideal arch length, on the
alignment of the teeth is determined by amount of dental crowding
and antero-posterior positioning of incisors in relation to the
facial skeleton. Performed on both arches. 13. CONCLUSION
