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Chhom Karath
1. A Clinical Conference Case
Presented in Partial Fulfillment of the
Requirements for the Degree of
Master of Science in Dentistry,
m.s. (Orthodontics)
CHHOM KARATH
2. Chief Complaint: Want to align lower teeth and hide upper gum during smiling.
Medical History: Some Remarkable
Dental History:
•Regular check up every 6 month
•Root canal treatment and crown #46
Family History: Unremarkable
Family History: Unremarkable problem
1. Interviews / Questionnaire
Patient Initial: U SP Age: 32y , Sex: f, Birth Date: August 4,1987
Heigh:1.58 m , Weigh: 48 kg, Career: Pharmacist
5. 5
2. Clinical Examination
Soft-tissue assessment
•Increase upper facial heigh
•Competent lip
•Mild facial Asymmetry face
•Short upper lip length
•Imbalance vertical facial height
•Imbalance vertical lip-chin
•Potentially competent lips
•Body type: Athletic
•Shape of head: Mesiocephalic
•Facial form: Mesoprosopic
•Tip of nose deviation to the right
•Chin deviation to the right side
17mm (1/3)
32mm (>2/3)
6. 6
2. Clinical Examination
Smile Aesthetics assessment
•Gummy smile on upper teeth
•Incisal edges of upper teeth 10%
hidden by lower lip.
• Small on right buccal corrido
•No teeth show on lower teeth
•Smile: wide
•Smile arch: straight
•Smile is not acceptable
•Lower midline to upper midline off
to the right side by 0.5mm
•Contact point: not good(50%,40%,30%)
•Embrassure not well
form(20%,30%,40%,50%)
•Hypertonic lower lip
50%
40% 40%
20%40%
7. 7
2. Clinical Examination
Smile Aesthetics assessment
•Gummy smile(Dento-alveolar etiology)
•Narrow on right buccal corridors(dark buccal corridors)
•Hidden upper incisor edges by lower lip 10%-15% (thick lower lip, thin upper lip)
•Gingival display level left central incisor is higher 0.5mm from right central incisor lateral teeth
0.5mm from central
•Gum color: pink, texture: normal, shape: scalloped
•Normal frenal attachment level
•Tooth width ratio non balance(x,x-1mm,x-2mm)
9. 9
2. Clinical Examination
Smile Aesthetics assessment
•Volume of interdental papilla formation is 45%(ideal 40%-50% length max incisor)
10. 1
0
2. Clinical Examination(Orthopantomograph-OPT)
TMJ
•No signs of TMD(No clicking, crepitus, and tenderness to palpation)
•Normal range of opening, lateral movement and no displacement.
•No erosion
•Normal opening and side to side openning
•TMJ space obliterated on the right side. Also associated with mild condylar resorption
on the same side.
•Normal condyles
14. 1. Molar class I, canine class I, lower arch: asymmetric constricted arch
2. Incisor class III(edge to edge)
3. Molar class I, canine class I
4. U-shape arch form, attrition #16,26,staining #17,18,27,28. Rotate #14,15, assymetry arch form
5. Over jet 2mm, over bite 10%
6. Crowding #41,#42,#32,z#32. Rotate #34,#44. U shape arch form
7. Soft tissue: good, Normal tongue size and function
8. Attached gingival scaring
9. Fair oral hygient, good oral mucosa, no teeth missing, no mid line shift, crack #13,#23
10. Normal tongue position, Normal palate
11. IOTN: grade 2
1 2 3
4 5 6
20. AREA OF STUDY YAS MEASUREMENT STANDARD INITIAL INTERPRETATION
Cranial Base BA–S-n 130o 141o
Long face
Maxilla to Cranial Base SNA 82 o 81o
Prognathic maxilla
N-A-FH 90 o 97o
A-Nas Vert. (mm) -2mm 10mm
Mandible to Cranial Base SNB 80 o 76o
Retronathic
mandible
NPog-FH 88 o 91o
Po-N Vert. (mm) -6mm 0o
Maxillo-Mandibular Relationship ANB 2 o 5o
Class IIA-NPog 1mm 2mm
Wits 2mm 5mm
Vertical Height SN-MPA 32 o 32o
Mandibular plan height
angle
Normal facial heigh
FMA 25 o 15o
N-ANS (%) 45% 42%
ANS-Me (%) 55% 58%
Maxillary & Mandibular Incisor Position U1-SN 104 o 106o
proclination of upper
incisor
proclination of lower
incisor
U1-NA (mm) 4mm 2mm
U1-NA 22 o 27o
IMPA 90 o 101o
L1-NB (mm) 4mm 3mm
L1-NB 25 o 31o
L1-APog 2mm 6mm
U1-L1 130 o 119o
Soft Tissue E-line-Lower lip -2mm 0mm Protrusion of the lip
21. ODI=FH pl. to palatal plan angle + AB to mandibular plan angle=8.5O+78O=86.5O
Openbite tendency<(74.5O±6.07O)<Overbite tendency
=> Overbite tendency
Bo
Po
Co
S pt
Go
PNS
ANS
Or
N
A
B
Me
Gn
Pog
Ba
22. •APDI=FH to palatal plane angle(8O)+Facial angle(91O)+AB plane
angle(7O)=8O+91O+7O=106O => Class III tendency
(Class II tendency<(81.4O±3.79O<Class III tendency)
•Facial angle(84.04O±3.42O)=FH to Npog=91O => Prominance of chin
•Y-axis(66.36O±3.85O )=FH-SGo=54O=> Class III facial pattern
•Gonial angle: Ar-Go to Go-Me=119O (122+-6.9 for female, 119.1+-6.5 for male)=>Open bite tendency
Bo
Po
Co
S pt
Go
PNS
ANS
Or
N
A
B
Me
Gn
Pog
Ba
Ar
23.
24. 3. Model Analysis
1. M-D width of teeth
7 6 5 4 3 2 1 1 2 3 4 5 6 7 Sum
Max 8.5 10 7 7 6.5 6 8 8 6 7 7 6 10 9 106
Man 9 11 6.5 7 6 6 5 5 5.5 6 7 7 10.5 9.5 101
2. Arch segments lengths
7-6 5-4 3-2 1-1 2-3 4-5 6-7 sum
Max 19 13.5 12 16 13 13 20 106.5
Man 20 13.5 10 9.5 10.5 13.5 20 97
Total max ant=41.5mm
Total man ant=33.5mm
25. 3. Model Analysis
3. Arch length determination
Max Man
Intercanine width 34mm(N=39) 25mm(N=23-24.7)
Intermolar width 43mm(N=47) 40mm(N=43)
Arch length 36mm 32mm
Arch form U form V form(tapered)
Arch length discrepancy Avialable –Required=
106.5-106=0.5mm(spacing
0.5mm)
Avialable –Required=
97-101.5=-4mm(crowding
4.5mm)
Overbite 1mm
Overjet 1mm
Curve of spee 2 mm
28. 3. Model Analysis
Standard Patient’s index
Overall ratio 87.5-94.8 97/106.5=91.07%
(Man/Max)
Anterior ratio 74.5-80.4 33.5/41.5=80.7%
(Man6/Max6)
4. Bolton Index
Mandible:Maxilla(12
teeth)
Mandible(6 teeth)>Maxilla(6
teeth)
29. 3. Model Analysis
5. M-D width of tooth
Anterior tooth Ratio
= Sum of (M-D) width of mandubular anteriors x 100
Sum of (M-D) width of maxillary Anterior
= 41/33.5 x 100 = 122 %
Result>72.2%= Mandibular excess.
Overall tooth Ratio
Mandibular excess= Actual mandibular 12 – Correct mandibular 12
= 82.5-87 = -4.5mm
30. 3. Model Analysis
6. Pont’s Analysis
ON MAXILLA
•SI=sum of incisor 4= 6+8+8+6=28mm
•MPV(Mesured premolar value)=39mm
•MMV(Mesured molar value)=43mm
•CPV(Calculated premolar value)=SIx100/80=28 x 100/80=35mm
•CPV(35mm)<MPV(39mm) Arch form is normal so no need to expand the arch
on incisor and premolar area
•CMV(Calculated molar value)=SI x 100/64=28 x 100/64=43.75mm
•CMV(43.75mm)>MMV(43mm) Arch form is normal so need to expand the
arch abit or no need on molar area
ON MANDIBLE
•SI=sum of incisor 4= 6+5+5+5.5=21.5mm
•MPV(Mesured premolar value)=35mm
•MMV(Mesured molar value)=45mm
•CPV(Calculated premolar value)=SIx100/80=21.5 x 100/80=21.8mm
•CPV(21.8mm)<MPV(35mm) Arch form is normal so no need to expand the
arch on incisor and premolar area
•CMV(Calculated molar value)=SI x 100/64=21.5 x 100/64=33.59mm
•CMV(33.59mm)<MMV(45mm) Arch form is narrow so need to expand the
arch abit
31. 3. Model Analysis
7. Korkhaus analysisis
Man Value=Max value -2mm
18mm=21-2mm=19mm
=> Procline upper incisor 1mm
32mm
39mm
21mm
18mm
32. Diagnosis summary
• U PS is a 31 year olds female, denied any medical problem , complains of
upper teeth forward, crowding lower anterior teeth and gummy smile.
She has a class I incisor relationship as edge to edge incisor base on class
II skeletal pattern, increased lower facial height. Over jet of 1mm, deep
over bite 5%, lower midline shift to the right 0.5mm, mildly crowed lower
anterior teeth. Canine is class I on both side, actually molar class I on
both sides.
40. Treatment progress
Problem list Treatment & link to photo Date Lecturer
1. Staining#17,18,27,28, plaque
and calculus, crack #13,#23
1. Scaling, polishing ,oral
hygiene
education, observation on
#13,23
30/5/2019 Dr. Anan
2. Release crowding, leveling
and alignment with
MBT(bracket 0.022)
2. Upper and lower bracing 30/6/2019 Dr. Anan
3. Release crowding, leveling
and align ment with
MBT(bracket 0.022)
3. Upper 0.014, lower 0.012 22/8/2019 Dr. Anan