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Файл:Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_4421_Библиотеки_им_академика_М_И_Перельмана.pdf
X
- •Contents
- •Contributors
- •1.6 Mixed Disorders
- •1.7 Isolated Symptoms
- •1.7.1 Snoring
- •1.7.2 Catathrenia
- •1.8 Summary
- •References
- •1.1 Introduction
- •1.2 Obstructive Sleep Apnea
- •1.2.1 Obstructive Sleep Apnea, Adult
- •1.2.2 Obstructive Sleep Apnea, Pediatric
- •1.3 Central Sleep Apnea
- •1.3.5 Primary Central Sleep Apnea
- •1.5 Sleep-Related Hypoxemia Disorder
- •2.7 Summary
- •References
- •3: Health Consequences of Obstructive Sleep Apnea
- •3.1 Cardiovascular Consequences
- •3.1.1 Chronic Heart Failure
- •3.1.2 Systemic Hypertension
- •3.1.3 Coronary Heart Disease
- •3.1.4 Arrhythmias
- •3.1.5 Cerebrovascular Disease
- •3.2 Respiratory Consequences
- •3.2.1 Asthma
- •3.2.3 Pulmonary Embolism
- •3.2.4 Pulmonary Hypertension
- •3.3.1 Diabetes Mellitus
- •3.3.2 Metabolic Syndrome
- •3.3.3 Sexual Dysfunction
- •3.4 Gastrointestinal Consequences
- •3.4.2 Nonalcoholic Fatty Liver Disease
- •3.5 Obstetric Outcomes
- •3.5.2 Gestational Diabetes
- •3.5.4 Maternal Surgical Complications
- •3.6 Perinatal Outcomes
- •3.6.1 Impaired Fetal Growth
- •3.6.2 Preterm Birth
- •3.6.4 Stillbirth
- •3.6.5 NICU Admission
- •3.7 Perioperative Outcomes
- •3.8 Accident-Related Consequences
- •3.9 Cancer-Related Outcomes
- •3.10 Survival Outcomes
- •3.10.1 Overall Mortality
- •3.10.2 Cardiovascular Death
- •3.10.4 Perioperative Mortality
- •References
- •4.1 Patient Case
- •4.2 Introduction
- •4.3 History
- •4.4.1 Oxygen
- •4.4.2 Vascular
- •4.4.3 Endocrine
- •4.6.1 Attention & Executive Function
- •4.6.4 Visual-Spatial
- •4.7 Summary
- •References
- •5.1 Introduction
- •5.2 Obesity
- •5.3 Hypertension
- •5.4 Diabetes Mellitus
- •5.5 Fatty Liver Disease
- •5.6 Conclusions
- •References
- •6.1 Background
- •6.2 History Taking
- •6.3 Physical Examination
- •6.4 Conclusion
- •References
- •Further Reading
- •7.1 Background
- •7.2.2 Screening Tools
- •7.2.3 Diagnostic Tests
- •7.2.7 Clinical Guidelines
- •7.3 Home Sleep Apnea Test (HSAT)
- •7.3.1 Advantages
- •7.3.2 Disadvantages
- •7.3.3 Patient Selection
- •7.3.4 Data Obtained
- •7.3.8 Recommended Follow-Up
- •7.3.9 Clinical Outcomes
- •7.4 Polysomnography (PSG)
- •7.4.1 Patient Selection
- •7.4.4 Follow-Up
- •7.5 Conclusions
- •Further Reading
- •8.1 Introduction
- •8.4 CBCT and OSA
- •8.5.1 CPAP
- •8.5.2 Oral Appliances
- •8.5.3 Maxillomandibular Advancement
- •8.6 Upper Airway Stimulation
- •8.7 Summary
- •References
- •9.1.1.1 Cranial Base Lengthening
- •9.1.1.2 Cranial Base Flexion
- •9.1.5.3 Tongue Growth
- •References
- •10.2.1.1 Cranial Base
- •10.2.1.2 Facial Height
- •10.2.1.4 Pharyngeal Airway Space
- •10.2.1.6 Hyoid Bone Position
- •10.3.1 Maxillary Expansion
- •10.3.1.4 RME for OSA
- •References
- •11.2 Pathophysiology
- •11.3 Clinical Exam
- •11.5 Treatment
- •11.6 Summary
- •References
- •12.1 Introduction
- •12.5 Mask Options
- •12.6.1 Dry Mouth
- •12.6.2 Tangled Tubing
- •12.6.3 Condensation
- •12.6.4 Headgear Problems
- •12.6.6 Ramp
- •12.6.7 Cleaning Equipment
- •12.6.8 Skin Irritation
- •12.6.9 Nasal Congestion
- •12.6.10 Aerophagia
- •12.7 Cleaning Equipment
- •12.7.1 Travel Options
- •References
- •13: Oral Appliance Therapy
- •13.1 Introduction
- •13.2 Terminology
- •13.3.2 Device Designs
- •13.4 Methodology
- •13.7.2 Device Design
- •13.7.5 Non-anatomical Traits
- •13.7.6 Disease Severity
- •13.7.7 Supine Dependency
- •13.12.3 Adherence
- •13.12.4 Mean Disease Alleviation
- •13.13 Long-Term Outcomes
- •13.16 Guidelines
- •References
- •14.1 Introduction
- •14.2 Positional Therapy
- •14.2.1 Weight Loss
- •14.2.2 Nasal EPAP Therapy
- •14.2.3 Oral Pressure Therapy
- •14.2.4 Hypoglossal Nerve Stimulation
- •References
- •15.1 Introduction: Background Information
- •15.4 Preoperative Assessment
- •15.4.1 Physical Examination
- •15.4.2 Polysomnography
- •15.4.3 Clinical History
- •15.5 Preoperative Consent
- •15.6 Preoperative Assessment
- •15.6.1 Surgical Setting
- •15.8 Instrumentation
- •15.8.1 Tonsillectomy
- •15.8.2 Adenoidectomy
- •15.9 Postoperative Management
- •15.9.1 Pain
- •15.9.2 Diet
- •15.9.3 Follow-Up
- •15.10 Expected Outcomes by Population
- •15.10.1 General Population
- •15.10.2 Complex Children
- •15.10.2.1 Obese Children
- •15.10.2.2 Down Syndrome
- •15.10.2.3 Craniofacial Syndromes
- •15.10.2.4 Synchronous Airway Lesion
- •15.11.3 Cardiovascular Parameters
- •15.13 Conclusion
- •References
- •Further Reading
- •16.1 Introduction
- •16.3.1 Anatomic Factors
- •16.8 Summary
- •References
- •17: Palatal Surgery for OSA Patients
- •17.1 Introduction
- •17.2.2 Nasopharyngeal Endoscopy
- •17.2.3 Cephalometrics
- •17.3.1.1 Success Rate of UPPP
- •17.3.1.2 Limitations of UPPP
- •17.3.1.3 Impact of UPPP
- •17.3.1.4 Complications of UPPP
- •17.3.2.2 Z-Palatopharyngoplasty
- •17.3.2.3 Expansion Sphincter Pharyngoplasty
- •References
- •18: Hypopharyngeal Surgery for OSA Patients
- •18.1 Introduction
- •18.2 Historical Perspective
- •18.3 Patient Selection
- •18.4 Physical Exam
- •18.5 Imaging I
- •18.5.1 Imaging
- •18.6 Drug-Induced Sedated Endoscopy
- •18.7 Treatment Algorithm
- •18.8 Procedures
- •18.8.1 Transoral Robotic Surgery
- •18.8.2 Radiofrequency Ablation (RFA)
- •18.8.3 Genioglossus Advancement
- •18.8.4 Tongue Base Suspension
- •18.8.5 Hyoid Suspension
- •18.8.7 Hypoglossal Nerve Stimulators
- •18.9 Future Directions
- •References
- •Suggested Reading
- •19.1.1 Imaging
- •19.2.1.1 Pierre Robin Sequence
- •19.2.1.2 Craniofacial Microsomia
- •19.2.2.1 Crouzon’s Syndrome
- •19.2.2.2 Apert Syndrome
- •19.2.3.1 Treacher Collins Syndrome
- •19.2.3.2 Goldenhar Syndrome
- •19.3 Surgical Correction
- •Bibliography
- •20.1 Introduction
- •20.4.2 Surgical Technique (DOME)
- •20.4.4 Consolidation Phase
- •20.6 Discussion
- •References
- •21.3.3 Maxillomandibular Setback
- •References
- •22.1 Introduction
- •22.3 Results
- •22.3.1 Success Rate
- •22.4 Cases
- •22.5 Discussion
- •22.6 Conclusion
- •References
- •23.1 Patient Evaluation
- •23.1.1 Patient Concerns
- •23.1.4 Facial Evaluation
- •23.1.5 Lateral View
- •23.1.6 Oral Examination
- •23.1.7 Periodontal Evaluation
- •23.1.8 Tongue Assessment
- •23.1.9 Temporomandibular Joint
- •23.1.10 The Nose
- •23.1.11 Oropharyngeal Airway Assessment
- •23.2 Radiographic Evaluation
- •23.2.2 Lateral Cephalometric Radiograph
- •23.2.5 Cephalometric Analysis
- •23.3 Dental Model Analysis
- •23.3.1 Arch Length Measurements
- •23.3.2 Tooth Size Analysis
- •23.3.3 Tooth Position
- •23.3.4 Arch Width Analysis
- •23.3.6 Cuspid-Molar Position
- •23.3.7 Tooth Arch Symmetry
- •23.3.10 Ankylosed Teeth
- •23.4 Summary
- •References
- •24.1 TMJ Articular Disc Displacement
- •24.3 Reactive Arthritis (ReA)
- •24.5 Trauma
- •24.6 TMJ Ankylosis
- •24.7 Other End-Stage TMJ Conditions
- •24.8 Summary
- •References
- •25.1 Background
- •25.2 Treatment Planning Maxillary Surgery
- •25.2.1 Bone Anatomy
- •25.2.2 Vascular Anatomy
- •25.5 Adjunct Procedures
- •25.6 Complications
- •References
- •26: Mandibular Surgical Procedures
- •26.1 Genioplasty Procedures
- •26.2 Osseous Genioplasty
- •26.2.1 Anteroposterior Augmentation
- •26.2.2 Surgical Procedure
- •26.2.3 Anteroposterior Reduction
- •26.2.4 Vertical Augmentation (Downgraft)
- •26.2.5 Vertical Reduction
- •26.3 Alloplastic Augmentations
- •26.3.1 Surgical Procedure
- •26.4 Genioplasty Complications
- •26.5 Mandibular Subapical Procedures
- •26.5.3 Possible Complications
- •26.6 Mandibular Body Surgery
- •26.7.1 Nonunion or Malunion
- •26.7.3 Infections
- •26.7.4 Periodontal Defects
- •26.7.5 Nerve Damage
- •26.8 Mandibular Ramus Surgery
- •26.9 Vertical Ramus Osteotomy
- •26.11.1 Early Relapse
- •26.11.2 Condylar Sag
- •26.11.4 Unfavorable Splits or Fractures
- •26.11.6 Periodontal Defects
- •26.11.8 Nerve Injury
- •26.11.9 Infections
- •26.11.10 Nonunion
- •26.11.11 Bleeding Problems
- •References
- •27.1 Occlusal Plane Alteration
- •27.1.1 History
- •27.2 Corrected Frankfort Horizontal Plane
- •27.3 High Occlusal Plane (HOP) Facial Type
- •27.3.6 MRI Evaluation
- •27.3.7 TMJ Disc Displacement
- •27.3.9 Reactive Arthritis
- •27.3.11 Other End-Stage TMJ Pathologies
- •27.6 Summary
- •References
- •28: Maxillomandibular Advancement
- •28.1.1 Symptoms
- •28.1.3.1 Noninvasive Treatments
- •28.1.3.2 Surgical Interventions
- •28.4.1 Preoperative Medical Assessment
- •28.5 Procedure
- •28.5.1.2 Plates Vs. Screws
- •28.7 Post-MMA Follow-Up Care
- •28.8 Conclusion
- •References
- •29.2.1 CASS Adoption Widespread
- •29.2.2 Overall CASS Accuracy
- •29.2.2.1 Soft-Tissue Prediction Simulators
- •29.2.3 Cost
- •29.4.1 Overall CASS Process
- •29.4.1.1 Step 1: Patient Referral
- •29.4.1.7 Step 7: Procedure
- •29.4.4 Case 3
- •29.5 Conclusion
- •References
- •30.1 Introduction
- •30.2 Preoperative Considerations
- •30.2.1 Surgical Facility
- •30.2.2 Medical Clearance
- •30.2.3 Anesthesia Considerations
- •30.3 Inpatient Postoperative Management
- •30.3.1 Immediate Postoperative Course
- •30.3.2 Acute Pain Management
- •30.3.5 DVT Prophylaxis
- •30.3.6 Nutrition
- •30.3.7 Antibiotics
- •30.4.1 Follow-Up Regimen
- •30.4.2 Postoperative Occlusal Guidance
- •30.5 Conclusion
- •References
- •31.1 Paradigm
- •31.2 Preoperative
- •31.3 Acute Post-surgical
- •31.4 Long-Term Post-surgical
- •References

128
S.-J. Kim and K. B. Kim
. Table 9.1 Timeline of normal development and craniofacial alteration resulting in abnormal respiratory function
Critical time point 5–6y 7–9y 12–15y 15–18y
Main growth event Neural growth ends
(~95%): from cranial to
facial dynamics
1st molar eruption
Normal growth and development
Main
skeletal
growth
site
9
Pharyn-
geal soft
tissue
Cranium 1. Basicranial exion
→ Dolicho/Brachy pattern
→ Affects facial depth,
width, height
2. Cranial base lengthening
→ Displaces maxilla forward
3. Mid- cranial fossa
development
→ Displaces glenoid fossa
Nasomaxillary
complex
(NMC)
Mandible
and hyoid
Adenoid
tonsils soft
palate
Tongue 1. Tongue development
1. Displacement by
ACB growth (*) &
circum-maxillary
sutural growth
2. Nasal septal cartilage
→ Nasal cavity
development
→ Push midface forward
3. Additional surface
remodeling
1. AP growth>vertical
growth
→ Rate body
length>ramus
2. Hyoid triangle
established (~4–5y)
1. Airway dimension
is mostly established
and substantially
maintained afterwards
ends
→ Affects mandibular
development
2. Backward and downward displacement
toward oropharynx
Benchmark of midface
growth
Juvenile mandibular
growth spurt
1. Residual growth of
ACB length: frontal
sinus development
2. SES ossied
→ Affects facial height
1. Forward and
downward
displacement by
sutural growth (*)
→ Width, depth height
growth
2. Downward drift of
palate (PNS)
→ Palatal depth
remodeling
→ Soft palate
uprighting
→ Nasal cavity increase
1. Juvenile growth
spurt– mandibular
internal rotation
→ Gonial angle
decrease
→ Determines
mandibular shape
1. Enlargement
→ No inuence on
retropalatal airway
width: maxillary
forward growth and
palatal bone drift
→ Upright soft
palate and increase
nasopharyngeal airway
→ Compensate
enlarged A&T
1. Increase m tongue
size
→ Transient decrease
of retroglossal airway
PHV (puberty) permanent dentition
1 Post-cranial base
growth
→ SOS starts ossied
→ Increases maxillary
depth
→ Affects mandible
position
1. Maxillary width
and depth growth
decreased
2. Active maxillary
height growth and
palate remodeling
1. Mandibular growth
spurt-vertical growth
of condyle and ramus
→ CCW external
rotation and surface
remodeling
2. Second puberty of
hyoid growth →
consistent mandiblehyoid-cervix
relationship
1. Reduction of A&T
size
1. Tongue moves lower
→ Upright soft palate
→ Increases retroglos-
sal airway
2. Increase of retroglossal airway by
mandible growth
Post-adolescence
growth decelerates/ends
1. PCB growth
ends: SOS
closed
1. Midpalatal
suture ossied
2. Maxillary
growth ends
1. Residual
growth of
mandible
2. Stable hyoidcervical
relationship
maintaining
UA patency
1. Later
development of
lingual tonsils
→ Affects
retroglossal
airway

Craniofacial Morphology Related to Obstructive Sleep Apnea: Growth of Craniofacial Bones…
. Table 9.1 (continued)
Critical time point 5–6y 7–9y 12–15y 15–18y
Craniofacial alteration affected by abnormal respiratory function
Critical inuencing factor
on craniofacial growth
1. Extended head posture
→ Inhibit cranial exion
→ Dolichocephalic pat-
tern
→ Post. positioning of
MC fossa
→ Protruded maxilla and
retrognathic mandible
2. Low posterior tongue
posture
→ Decent hyoid
→ Impairs mandibular
forward G. and affects
symphysis growth (by
extended suprahyoid m.)
1. Nasal obstruction
→ Inhibits maxillary
forward/lateral G.
2. Abnormal habit
causing impaired
palatal bone drift
→ Deep palatal vault,
narrow arches, and narrow nasal cavity
→ Decient constricted
maxilla (CIII)
3. Excessive ATH
→ Retropalatal
obstruction– Mouth
breathing
→ Poor mandibular
internal rotation
→ Increases mandibular divergency
4. Low tongue posture
→ Retroglossal
obstruction
→ Hyperdivergency,
long symphysis
1. Persistent ATH
→ Retropalatal
obstruction mouth
breathing
→ Increases maxillary
height, increase of
palatal depth, decrease
of palatal width and
Mandibular CW rotation long face and ant.
openbite
2. Sagittal mandible
growth is controversial
129
9
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Orthodontics andSleepDisordered Breathing
KiBeomKim andSu-JungKim
Contents
10.1 The Diagnostic Value ofCephalometrics forAirway
Evaluation– 136
10.2 Relationship Between Craniofacial Characteristics
andOSA–137
10.2.1 Cephalometric Characteristics ofAdult OSA Patients – 138
10.2.2 Cephalometric Characteristics ofPediatric OSA Patients – 140
10.3 Relationship Between Craniofacial Characteristics
andOSA–141
10.3.1 Maxillary Expansion – 141
10.3.2 Orthodontic Extraction andtheRisk ofOSA – 148
10.3.3 Headgear andRisk ofOSA – 149
10.3.4 Protraction Headgear forOSA – 150
10.3.5 Chin Cup andOSA – 151
10.3.6 Functional Appliances Treatment forClass II Malocclusion
andOSA–151
135
10
References – 155
© Springer Nature Switzerland AG 2021
K. B. Kim et al. (eds.), Management of Obstructive Sleep Apnea, https://doi.org/10.1007/978-3-030-54146-0_10

10
136
K. B. Kim and S.-J. Kim
The topics of disturbed sleep and the airway have
drawn interest among orthodontists since the beginning of the profession. In fact, these issues were discussed more than a century ago in the very rst issue
of the American Journal of Orthodontics & Dentofacial
Orthopedics in 1915 (then The International Journal of
Orthodontia), in which physician Daniel M’Kenzie dis-
cussed their potential relation with craniofacial structure and malocclusion [1]. As discussed in the previous
chapter (7
breathing, and other related issues are surmised to have
some effect on craniofacial growth, malocclusion, and
respiration. Many orthodontists have taken a general
interest in these issues and their potential relationship with obstructive sleep apnea (OSA). This chapter focuses on an evidence-based discussion regarding
these topics as they relate to OSA.
Chap. 9), adenoid hypertrophy, mouth-
10.1 The Diagnostic Value
ofCephalometrics forAirway
Evaluation
The lateral cephalogram is the part of the standard orthodontic records and the most commonly used imaging
modality. Because the diagnostic process using cephalometric radiographs and cone beam computed tomography (CBCT) was discussed in the previous chapter,
evaluation of adenoid hypertrophy and obstruction in
the nasopharyngeal airway using lateral cephalography will be discussed in this chapter. The relationship
between facial growth and breathing has been a subject
of controversy in orthodontics, particularly relating to
how adenoid tissue and mouth- breathing affect craniofacial growth. A variety of imaging techniques have
been used to diagnose adenoid hypertrophy [2–7].
Nasal endoscopy is the most common method in
otolaryngology to evaluate adenoid hypertrophy and
nasopharyngeal airway obstruction [8–12]. In addition, rhinomanometry [13, 14], acoustic rhinometry
[15], uoroscopy [12], computed tomography (CT) [16],
cone- beam computed tomography (CBCT) [17–21], and
magnetic resonance imaging [22, 23] have been used as
well. Besides cephalometrics and CBCT, however, the
remaining imaging techniques are not commonly used
in orthodontics because of their invasiveness, high radiation, and cost.
Many researchers have used cephalometrics to identify key craniofacial characteristics of OSA patients,
and several studies have investigated its diagnostic value
in identifying adenoid hypertrophy and upper respiratory tract obstruction [24–29]. In 1979, Fujioka etal.
[4] introduced the adenoid-nasopharynx (A/N) ratio
to determine adenoid size using cephalometrics. Its
advantage is the assessment is not impacted by changes
in horizontal or vertical position of the patient [30].
McNamara’s analysis, or McNamara’s line, has become
one of the most important and common analytical tools
for orthodontists to evaluate and describe structural
relationships that affect the airway and is fundamental
for diagnosis of many conditions, including adenoid
hypertrophy [28]. (See .
Figs.10.1, 10.2, and 10.3).
Caylakli etal. [8] reported on the reliability of the A/N
ratio calculated by a lateral cephalogram (evaluated by a
blinded author) and nasal endoscopy for measuring the
size of adenoid tissue. A total of 85 patients (52 males,
33 females; mean age: 5.0±2.2years; range: 2–12years)
with a suspected prediagnosis of adenoid hypertrophy
between June 2007 and March 2008 were included. The
average A/N ratio was 0.87±0.1, which was reported to
have a statistically signicant Pearson correlation with
nasal endoscopy (r=0.511; P<0.0001). However, Feres
etal. [31] questioned the value of the lateral cephalography regarding detection of adenoid hypertrophy and
nasopharyngeal obstruction in their systematic review,
citing spectrum bias in the evaluation of patients with
the disease and those without. They noted that the study
by Caylakli etal. was the only one among all studies citing the A/N ratio that recruited patients with suspected
adenoid hypertrophy, whereas the other four studies [6,
15, 32] included patients with an previously conrmed
diagnosis.
B
C
N
A
A´
. Fig. 10.1 A/N ratio. Adenoidal measurements (A): distance from
A′ point of maximal convexity, along inferior margin of adenoid
shadow to line B, drawn along straight part of anterior margin of
basiocciput. Nasopharyngeal measurement (N): distance between
posterior nasal spine (PNS) and C, anteroinferior edge of sphenobasioccipital synchondrosis
PNS

Orthodontics andSleep-Disordered Breathing
Upper pharynx
width
Lower pharynx
width
. Fig. 10.2 McNamara Analysis. Airway widths according to
McNamara analysis, upper pharynx and lower pharynx widths
137
dene the relationship between adenoid hypertrophy
and associated symptoms, afrming that this method
was useful as a treatment planning tool. Kurien etal. [34]
also evaluated the reliability of lateral cephalography in
the diagnosis of adenoid hypertrophy and determine
if exible nasopharyngoscopy validated ndings. They
showed statistically signicant agreement was observed
between the two techniques, although the accuracy of
lateral cephalography was a suboptimal 65%.
Wang et al. [35] compared 109 patients evaluated
with both nasal endoscopy and lateral cephalometrics,
nding a highly signicant relationship (P < 0.0001)
between both imaging methods. However, there was
some disagreement between the two imaging methods.
Notably, only 54% of patients who showed adenoid
hypertrophy by lateral cephalography radiographs were
conrmed by nasal endoscopy. In addition, radiographs
revealed 25.4% of children had a large adenoid that
nasal endoscopy could not conrm and, conversely,
nasal endoscopy revealed a large adenoid in 13% of children that radiographs could not conrm.
Filho etal. [36] in 2001 reported that while lateral
cephalography promised high sensitivity, specicity was
low in the diagnosing hypertrophy of the inferior and
middle turbinates vs. nasopharyngeal endoscopy. They
suggested nasal endoscopy is a more suitable method for
the diagnosis of diverse nasopharyngeal obstructions.
Major etal. conrmed this in 2014. Even though lateral cephalography showed good to fair sensitivity, they
found specicity widely varied, depending on the evaluation method used. Conversely, the clinical exam was
found to yield poor sensitivity but good specicity [37].
Furthermore, cephalograms have many disadvantages, such as the use of ionizing radiation [38] and can
only represent a 3D structure with a superimposed 2D
image [39]. One 2006 systematic review by Major etal.
[40] concluded that cephalograms can be used to evaluate adenoid hypertrophy, but they are less reliable for
determining the size of the nasopharynx. They suggest
lateral cephalography is best used as a screening tool for
diagnosing obstructed upper airways before a more rigorous follow-up is performed.
10
. Fig. 10.3 Example of hypertrophic adenoid cephalometrics
Saedi etal. [33] evaluated the diagnostic efcacy by
comparing patient’s symptoms with nasal endoscopy
and lateral cephalometrics ndings. They found both
cephalography and nasal endoscopy could adequately
10.2 Relationship Between Craniofacial
Characteristics andOSA
Some orthodontists have suggested that the soft tissue
of the airway should be considered when establishing an
orthodontic treatment plan to improve the likelihood of
orthodontic and orthopedic stability [41, 42]. As previously discussed, there is controversy surrounding what
specic morphology of the craniofacial structures, as
well as nasal obstruction and mouth-breathing, impacts
craniofacial growth. Linder-Aronson reported that

138
K. B. Kim and S.-J. Kim
10
hypertrophic adenoid tissue can cause the retrusion of
maxilla and mandible relative to the cranial base, and
can also cause narrow dental arches, posterior crossbite,
retro-inclination of maxillary and mandibular incisors,
short mandibular dental arches, increased facial height,
and a low tongue position [43].
Yamada et al. [44] suggested that nasopharyngeal
respiratory obstruction is associated with downward
and backward rotation of the mandible, upward and
backward growth of the condyle, a divergent gonial
angle, and anterior open bite. They suggested that
permanent craniofacial deformities form because of a
nasopharyngeal obstruction that existed prior to and
during puberty, causing a skeletal open bite. Trotman
etal. [45] suggested different craniofacial morphological
associations for lip posture, sagittal airway, and tonsils.
However, there is a controversy surrounding the relationships between head posture and/or facial patterns in
children with different malocclusions and structures of
the pharyngeal airway [46–48].
Other studies report other issues may be related to
respiratory problems, such as a lower facial height, a
retruded mandibular position, a deep palatal vault, and
a posterior crossbite [45, 49, 50].
Martin et al. conducted a study with Class I ideal
occlusion patients without OSA, suggesting that different skeletal patterns have different airway dimensions
[51]. Freitas etal. [52] evaluated 80 untreated adolescent
patients initially divided into two equal groups (Class I
and Class II), then separately dividing these groups on
the basis of normal and vertical growth patterns. Patients
with Class I and Class II malocclusions and vertical
growth patterns are known to have signicantly narrower
upper pharyngeal airways than those with Class I/II
malocclusions and normal growth patterns. However,
malocclusion type does not appear to inuence upper
pharyngeal airway width, nor do malocclusion type and
growth pattern inuence lower pharyngeal airway width.
Similarly, other research reports that Class II patients
and hyperdivergent patients had smaller airway size
dimensions [53]. Sagittal malocclusion type does not
appear to inuence upper pharyngeal width; however,
hyperdivergent subjects have statistically signicant narrower upper pharyngeal width when compared to normodivergent and hypodivergent vertical patterns [54].
Muto et al. [55] reported that the diameter of the
anteroposterior pharyngeal airway was largest in a
patient group with mandibular prognathism, followed
by groups of normal mandible and mandibular retrognathism. They suggested that the anteroposterior dimension of the PAS is affected by different skeletal patterns
of the mandible. Adult OSA patients have been characterized by a retrognathic mandible, maxillary hypoplasia, inferior position of the hyoid bone, a greater exion
of the cranial base, with an elongated soft palate [56].
However, one study that employed CBCT imaging showed that patients with different anteroposterior
jaw relationships varied in airway volumes and shapes;
furthermore, while airway shape differs in various vertical jaw relationships, volume does not [57]. However,
one study that evaluated 276 healthy adult subjects
17–27 years of age with CBCT found that SNB (the
angle between the anterior cranial base [SN] and the NB
line) and oropharyngeal airway volume had a weak statistical correlation with minimum cross-sectional area.
Despite this, the authors concluded that craniofacial
morphology does not appear to have a big impact on
upper airway dimensions [58].
It is difcult to conclude that there is an increased
risk of OSA just by observing decreased airway dimensions in cephalography and/or CBCT. A more comprehensive appraisal of OSA risk should be attempted
that includes a clinical examination accompanied with
a polysomnogram, as well as cephalometrics and/or
CBCT examinations.
The 2014 systematic review by Indriksone etal. [48]
concluded that there is insufcient evidence to prove
that the dimensions of the upper airway differ in various sagittal skeletal patterns. Many studies have tried to
elucidate how head and tongue posture affects pharyngeal airway dimension and shape. Furthermore, there
have been methodological concerns in studies in which
the posture of the head and tongue was not standardized during image acquisition [59–70]. For instance, a
standardized posture might be to position the head naturally and then capture the image after the patient has
swallowed and while the patient is holding their breath.
However, it is still questionable if this method will reliably show airway dimensions.
10.2.1 Cephalometric Characteristics
ofAdult OSA Patients
The following craniofacial characteristics are reported
to be different between normal, healthy adults and adult
individuals with OSA.
10.2.1.1 Cranial Base
Some studies reported that the cranial base length is
larger than the control for an OSA patient [71, 72], but
others showed that there was a signicantly shorter cranial base length [73–83]. (See . Figs.10.4 and 10.5).
According to a meta-analysis by Neelapu et al. [84]
reported that SN length in adult OSA patients was
2.25mm shorter than normal [84]. The authors concluded
that a decrease in cranial base length strongly suggests
shorter dimensions of the anteroposterior cranium, ultimately expressed as bimaxillary retrusion and a relatively
smaller pharyngeal airway.
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