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Facial Trauma 17
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Stranc MF, Robertson GA. Aclassification of injuries of the nasal
skeleton. Ann Plast Surg. 1979;2(6):468–74.
Sunderland S. Aclassification of peripheral nerve injuries produc-
ing loss of function. Brain. 1951;74(4):491–516. doi: 10.1093/ brain/74.4.491.
Veras RB, Kriwalsky MS, Eckert AW, Schubert J, Maurer P. Long-
term outcomes after treatment of condylar fracture by intra­oral access: Afunctional and radiologic assessment. J Oral Maxillofac Surg. 2007;65(8):1470–6.
Zide MF, Kent JN. Indications for open reduction of mandibular
condyle fractures. J Oral Maxillofac Surg. 1983;41(2):89–98. doi: 10.1016/0278-2391(83)90214-8.
Zingg M, Laedrach K, Chen J, etal. Classification and treat-
ment of zygomatic fractures: Areview of 1,025 cases. J Oral Maxillofac Surg. 1992;50(8):778–90.
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Jaw Deformity
ORTHOGNATHIC
Orthognathic Values
e following list describes common cephalometric values used in assessment, planning, diagnosis and surgical outcomes in orthognathic surgery.
AP maxillary:
Steiner SNA=81 ± 3
AP mandible:
Steiner SNB=79 ± 3
AP maxillo-mandibular:
Steiner ANB=2 ± 2
Occlusal plane is 7 or 8 degrees to Frankfort plane incisors:
Maxillary incisor inclination (Steiner)=22 ± 6 to NA line
U1-SN=104
Also, the aesthetic line dictates that a tangential line o the labial surface of U1 should be at a right angle to the Frankfort plane
Mandibular incisor inclination (Steiner)=25 ± 7 to NB line or Down’s IMPA=90 ± 5 degrees
DOI: 10.1201/9781003156895-3 19
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20 Classifications and Lists in Oral and Maxillofacial Surgery
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Chin:
Holdaway ratio is 0.5 in women, 1 in men [lower incisor to Pogonian (Pog) versus Pog to NB line]
So tissue thickness is 7 ± 2mm
Obstructive Sleep Apnoea (OSA) Classes
e following list classies obstructive sleep apnoea according to aetiology, which can include impairment of breath control and eort or a reduction in airow.
Obstructive
Central
Mixed
OSA Routine Referral from Primary Care
e score that follows allows the assessment of OSA in the pri­mary care setting and indicates when to complete a routine referral to OMFS care for a sleep study and further management.
Epworth score OVER 10
OSA Severity
e severity of OSA can be ascertained by the Apnoea Hypopnea Index (AHI) and Respiratory Disturbance Index (RDI) to aid diagnosis and management.
Mild – AHI > 5, RDI > 10
Moderate – AHI > 15, RDI > 30
Severe – AHI > 30, RDI > 50
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Jaw Deformity 21
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Fujita Classification of Sites of Airway Obstruction in OSA
is classication describes anatomical sites of obstruction in relation to OSA.
Type 1 – retropalatal (10%)
Type 2 – retropalatal AND retrolingual (20%)
Type 3 – retrolingual (70%)
OSA Urgent Referral (2WW)
e following list species the criteria which warrant urgent referral to OMFS.
Suspected H&N cancer
Working with machinery, hazardous occupation
Respiratory/heart failure
Severe OSAS symptoms and coexistent COPD
FURTHER READING
Fujita S. Pharyngeal surgery for obstructive sleep apnea and
snoring. In: Fairbanks DNF, Fujita S, Ikematsu T, Simmons FB, eds. Snoring and obstructive sleep apnea. New York: Raven Press; 1987: 101–28.
Goyal M, Johnson J. Obstructive sleep apnea diagnosis and
management. Mo Med. 2017;114(2):120–24.
Singh Rathore A, Dhar V, Arora R, Diwanji A. Cephalometric
norms for Mewari children using Steiner’s analysis. Int J Clin Pediatr Dent. 2012;5(3):173–7.
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22 Classifications and Lists in Oral and Maxillofacial Surgery
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TEMPOROMANDIBULAR JOINT (TMJ)
Acute Synovitis Index
is index describes the severity of synovium involvement in TMJ disorders.
1. Minimal
2. Moderate – early hyperaemia
3. Considerable – moderate hyperaemia
4. Total hyperaemia which obliterates vascular patterns
Classification of Condylar Sag
e following classication describes change in the position of condyle in relation to glenoid fossa aer surgical intervention/ rigid xation, which can result in altered occlusion.
Central (positioned wrongly)
Peripheral
Type 1 – resorption
Type 2 – sliding down edge of glenoid
Classification of Traumatic TMJ Ankylosis
is system describes ankylosis of the TMJ following trauma. Ahigher score correlates with increased severity of ankylosis.
1. Fibrous
2. Lateral bony with more than 50% of the normal condyle head remaining (compared to other side)
3. Less than 50% of normal condyle head remaining
4. Complete bony ankyloses
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Jaw Deformity 23
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Indications for TMJ Replacement in General
e following list describes general criteria that warrant the replacement of the TMJ.
End-stage arthritis
Recurrent ankyloses
Failed treatment with autogra/other
Loss of vertical height
Indications for TMJ Replacement According to Sidebottom et al.
e following list describes indications for TMJ replacement as highlighted by Sidebottom et al.
Prerequisite of failed conservative treatment with diagnosis by CT or MRI at a minimum
Disease causing condylar bone loss and symptomatic indications
Disease:
Osteoarthritis (OA)
Rheumatoid arthritis (RA)/ankylosing spondylitis (AS)/psori­atic arthritis (PsA)
Ankylosis
Post-trauma
Post-op
Previous prosthesis/costochondral gra/congenital deformity/ multiple procedures failed previously
Symptoms:
Dietary score less than 5/10
Maximal incisal opening (MIO) < 35mm
Occlusal collapse
Excessive condylar resorption
Quality of life (QOL) issues
Contraindicated if local infection, severe immunocompromise,
ASA 3/severe comorbidity.
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24 Classifications and Lists in Oral and Maxillofacial Surgery
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Sawhney Types of Ankyloses (1980s)
is classication describes ankyloses according to the degree of limitation in the mobility of the TMJ.
1. Fibrous
2. Lateral bony fusion
3. Bony bridge (ramus to temporal bone/arch)
4. Mass of bone (ramus to skull base)
Stages of Chondromalacia of Disc
e following list describes the pathological changes associated chon­dromalac ia of the articula r disc in the TMJ as per ar throscopic ndings.
1. Soening
2. Furrowing
3. Fibrillation
4. Crater formation/subchondral bone exposure
Stages of Internal Derangement
e following list describes stages of displacement of the TMJ articular disc in relation to the condylar head. More advanced stages are associated with crepitus and degeneration.
1st Clicking 2nd Locking 3rd Limited opening (closed lock, <27mm and severe pain) 4th Increased opening again (crepitus and degeneration – pain
reduced as no impingement)
Topazian Stages of Ankylosis (1960s)
is classication describes ankylosis of the TMJ according to the degree of anatomical involvement of various parts of the mandible.
1. At condylar process
2. To sigmoid
3. To coronoid
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Jaw Deformity 25
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Wolford Classification of Condylar Hyperplasia
is classication describes hyperplasia of the condyle of the mandible. e higher degree of complexity warrants more advanced surgical options to include condylectomy and total jaw replacement.
Type 1 – horizontal vector (hormonal in adolescence), slower growing side more likely to have disc displacement
1a bilateral – protocol is TREAT EARLY with high condy­lectomy, reposition discs, orthognathic surgery OR WAIT (until growth complete but worse deformity)
1b unilateral – TREAT EARLY (as preceding)
Type 2 – vertical vector (osteochondroma)
2a – large elongated and deformed condyle, protocol is LOW condylectomy, contralateral disc repositioning, orthognathic with or without inferior border recontouring, alternative is condylectomy with rib/total jaw replacement (TJR)/orthognathic lengthening
2b – exophytic mass, mostly anteromedially
Wilkes Classification of TMJ Internal Derangement
is classication describes internal derangement of the TMJ according to pain, opening, disc location, anatomy and perfora­tion (PODIA).
1. Painless, normal opening, disc slightly forwards, normal disc anatomy
2. Painful click, intermittent lock, displaced with reduction, deformed disc
3. Pain with any movement, locked and restricted, displaced no reduction, early bone changes
4. Pain at rest, moderate bony changes
5. Severe pain, perforation of retrodiscal tissue ± disc also, severe bony changes
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26 Classifications and Lists in Oral and Maxillofacial Surgery
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FURTHER READING
Brabyn PJ, Capote A, Muñoz-Guerra MF, Zylberberg I, Rodríguez-
Campo FJ, Naval-Gías L. Arthroscopic management of synovial chondromatosis of the temporomandibular joint. Case series and systematic review. J Maxillofac Oral Surg. 2018;17(4):401–9.
Dimitrouli, G. Management of temporomandibular joint disor-
ders: Asurgeon’s perspective. Aust Dent J. 2018;63:S79–90.
He D, Yang C, Chen M, etal. Traumatic temporomandibular joint
ankylosis: Our classification and treatment experience. J Oral Maxillofac Surg. 2011;69(6):1600–7.
Jędrzejewski M, Smektała T, Sporniak-Tutak K, Olszewski R.
Preoperative, intraoperative, and postoperative complica­tions in orthognathic surgery: Asystematic review. Clin Oral Investig. 2015;19(5):969–77.
Politi M, Toro C, Costa F, Polini F, Robiony M. Intraoperative
awakening of the patient during orthognathic surgery: Amethod to prevent the condylar sag. J Oral Maxillofac Surg. 2007;65(1):109–14.
Sawhney CP. Bony ankylosis of the temporomandibular
joint: Follow-up of 70 patients treated with arthroplasty and acrylic spacer interposition. Plast Reconstr Surg. 1986;77(1):29–40.
Sidebottom AJ. Guidelines for the replacement of temporoman-
dibular joints in the United Kingdom. Br J Oral Maxillofac Surg. 2008;46(2):146–7.
Topazian RG. Etiology of ankylosis of temporomandibular joint:
Analysis of 44 cases. J Oral Surg Anesth Hosp Dent Serv. 1964;22:227–33.
Wilkes CH. Internal derangements of the temporomandibular
joint. Pathological variations. Arch Otolaryngol Head Neck Surg. 1989;115(4):469–77.
Wolford LM, Movahed R, Perez DE. Aclassification system for
conditions causing condylar hyperplasia. J Oral Maxillofac Surg. 2014;72(3):567–95.
Young AL. Internal derangements of the temporomandibular
joint: Areview of the anatomy, diagnosis, and management. JIndian Prosthodont Soc. 2015;15(1):2–7.
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