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Original Article 1, Issue 6.4

Cephalometric Evaluation of Craniofacial Morphology in Pediatric Patients With Fully Diagnosed OSA With Distinct Sagittal Skeletal Malocclusions

http://dx.doi.org/10.15331/jdsm.7096

Simona Pisacane, DDS, MS1; Marco Carotenuto, DDS, MS, PhD2; Fabrizia d’Apuzzo, DDS, MS, PhD1; Maddalena Vitale, DDS, MS, PhD1; Vincenzo Grassia, DDS, MS, PhD1;  Carlos Flores-Mir, DDS, BSc, MSc, DSc3; Letizia Perillo, DDS, MS, PhD1*

1 Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli, Naples, Italy; 2 Department of Mental and Physical Health, University of Campania Luigi Vanvitelli, Naples, Italy ; 3 Department of Orthodontics, University of Alberta, Edmonton, Canada

ABSTRACT

Study Objectives:

To establish whether craniofacial and nasopharyngeal morphology, assessed through lateral cephalometry, in children properly diagnosed with obstructive sleep apnea (OSA) differed from that of non-likely OSA control children stratified based on sagittal malocclusion and to evaluate if there is any association with apneahypopnea index (AHI) severity.

Methods:

Various cephalometric measurements were compared between 22 children (mean age 8.8) with nocturnal polysomnography (nPSG) diagnosed OSA that had already adeno-tonsillectomy and a control group of 20 nonlikely OSA children (mean age 9.2) based on a negative pediatric sleep questionnaire (PSQ) results matched for age, sex and sagittal malocclusion.

Results:

Statistically significant increases in Go-Me and Ba^SN dimensions were observed among OSA children when higher AHI values (4.5 and 4 mm), whereas ANSPNS dimension was significantly increased in the Class II sample according to OSA severity (3.5 mm). No significant differences were identified for any variables among Class III based on OSA severity. In comparison to controls, in Class II both the angle between palatal plane and anterior cranial base and the angle of the flexure of cranial base were significantly reduced in OSA children (0.36 and 2.3 mm). In addition, an increased thickness of the upper adenoid profile and a reduced dimension of upper pharynx were observed (3.2 and 2.1 mm). In Class III a shorter bony nasopharynx was statistically significant (3.2 mm).

Conclusions:

The OSA sample showed some distinct craniofacial features compared to a non-likely OSA group. These differences were not consistently located when sagittal malocclusion was considered.

Keywords:

obstructive sleep apnea, nasopharynx, craniofacial features, malocclusions

Citation:

Pisacane S, Carotenuto M, d’Apuzzo F, Vitale M, Grassia V, Flores-Mir C, Perillo L. Cephalometric evaluation of craniofacial morphology in pediatric patients with fully diagnosed OSA with distinct sagittal skeletal malocclusions. J Dent Sleep Med. 2019;6(4)

INTRODUCTION

Obstructive sleep apnea (OSA) is a form of sleep-dis­ordered breathing (SDB). Patients with OSA experience re­peated episodes of partial or complete airway obstruction during sleep.1 The prevalence of OSA in children ranges from 1% to 4%.2 The pathophysiology of OSA is fre­quently associated with an increased upper airway re­sistance. This can affect the pulmonary ventilation, oxy­genation, and sleep quality.3 In a smaller number of OSA cases sleep breathing issues are linked to a central nervous system origin.4

Although the most common cause of pediatric OSA is adenotonsillar hypertrophy, other factors such as unfavor­able craniofacial skeletal morphology and growth patterns, nasal anatomic abnormalities, chronic sinusitis or allergic rhinitis, obesity, waist and neck circumference, and neuro­muscular disorders have to be considered.5

OSA is often associated with various symptoms such as loud and abnormal snoring or breathing, agitated sleep, frequent arousals, unusual sleeping positions, sweating during sleep, and nocturnal enuresis.6 All of these symp­toms could be associated with excessive daytime fatigue, morning headaches, impaired intellectual function and at­tention (school performance), mood disturbance, aggres­sive behavior, and hyperactivity.7

The reference standard to diagnose OSA is nocturnal polysomnography (nPSG), which allows clinicians to eval­uate the number of obstructive apneas and hypopneas per hour of sleep using the apnea-hypopnea index (AHI), and also to assess other sleep-related variables.8 However, nPSG is expensive, time-consuming, and frequently inac­cessible; thus, sleep breathing performance questionnaires have been proposed alternatively to at least suggest the presence of OSA in children. Among all the available ques­tionnaires, the Pediatric Sleep Questionnaire (PSQ) is the one of choice.9 Its negative predictive value is almost per­fect (99.9%). Previous cephalometric investigations on children with OSA have been synthesized in two system­atic reviews with meta-analyses.6,10 Decreased mandibular prominence, bimaxillary retrusion with reduced lengths, increased mandibular plane angle, and low hyoid position were all significantly associated with OSA. However, only a limited number of cephalometric variables were reported in the included studies and almost always focused on late deciduous or early mixed dentition cases (4 to 8 years of age). The age of 7 to 14 years (mid- to late mixed dentition) is usually when orthodontists do complete an initial ortho­dontic screening. Therefore, information from a later age, to be contrasted with previously younger reported samples, may allow identifying trends in how those cephalometric variables may have changed in older children populations if left untreated. Furthermore, in previous investigations patients and control patients were not differentiated based on a clearly defined craniofacial morphology. Hence, the objective of this study was to establish whether craniofacial and upper airways morphology in children aged 7 to 14 years suffering from OSA differed in any respect from that of non-obstructed control patients when matched based on sagittal malocclusion classification and subsequently to identify any correlation of the cephalometric variables with AHI severity.

MATERIALS AND METHODS

The study protocol was approved by the Ethics Com­mittee of the University of Campania Luigi Vanvitelli. Proper informed consent was obtained from the par­ents/guardian of each participant. The sample was selected from consecutive children referred to the Orthodontic Di­vision of the University of Campania Luigi Vanvitelli, Na­ples, Italy, from 2015 to 2018.

Selection criteria used for the study were: (1) age range 7 to 14 years; (2) no previous orthodontic treatment; (3) previous adenotonsillectomy; (4) absence of clinically noticeable craniofacial syndromes; (5) absence of obesity (BMI ≤ 95 percentile).11 A validated questionnaire (PSQ) was used for screening patients with suspected OSA. The parents of the selected children filled out this questionnaire regarding nocturnal and daytime potential obstructive sleep breathing signs and symptoms. All children with a positive questionnaire for suspected OSA were selected for the study and the definitive diagnosis was obtained through nPSG. All children with a negative questionnaire for OSA comprised the control group. As explained previously, a negative PSQ test almost always implies absence of OSA. Straining the PSG resources for cases unlikely to have OSA is questionable. A convenience sample of at least 20 sub­jects in each group with and without OSA was sought based on available records.

The PSQ questionnaire was used, including 22 symp­tom items about snoring frequency, loud snoring, observed apneas, difficulty breathing during sleep, daytime sleepi­ness, inattentive or hyperactive behavior, and other pediat­ric OSA features. A cutoff value of 0.33 was considered effective in suggesting pediatric OSAS.9

The OSA was definitively diagnosed by a sleep med­icine specialist at the Department of Mental and Physical Health and Preventive Medicine, Child and adolescent Neuropsychiatry of the University of Campania Luigi Van­vitelli, Naples, Italy, using a standardized nPSG, clinic, and other diagnostic criteria to evaluate the incidence of breath­ing abnormalities and oxygen saturation. Oxygen satura­tions were computed to determine the following measures: mean saturation of oxygen (SpO2) during sleep time; SpO2 nadir; and SpO2 desaturation indices during total sleep time, rapid eye movement, and non-rapid eye movement. An average number of oxygen desaturation events per hour during sleep was also evaluated. The severity of OSA was expressed using the AHI, which was calculated as the sum of obstructive and mixed apneas and hypopneas per hour of sleep during PSG monitoring. AHI was considered ab­normal in these children when the value was greater than 1, which was used as the criterion for OSA.8 On the basis of AHI, children in whom OSA was diagnosed were cate­gorized into an AHI < 5 events/h group or AHI > 5 events/h group to assess OSA severity dichotomously. An AHI > 5 events/h is considered moderate to severe in children.12

The skeletal malocclusions were identified as class II when children had an ANB angle of +5° or more and a Wits value >2 mm, and as class III with an ANB angle of 0° or less and a Wits value ≤ 2 mm. Lateral radiographic exami­nations were performed for each subject in both groups and analyzed by using a standardized protocol with an 8% mag­nification factor. The cephalometric analysis included common linear and angular measurements along with spe­cific variables to evaluate the nasopharyngeal and oropha­ryngeal airway dimensions13,14

(Figure 1) (Appendix I and II).
 

Statistical Analysis

All lateral cephalograms were hand-traced by the same operator. Ten radiographs chosen at random were re­traced and measured again by two different operators with the same expertise 4 weeks apart in order to calculate the intraobserver and interobserver errors of method, which was determined by intraclass and interclass correlation co­efficients using an absolute agreement definition for each variable.

Data are presented as mean and standard deviation. Unpaired t tests, assuming equality of variance, were used to compare all cephalometric variables between patients with OSA and control patients. Correlation coefficients were determined by Pearson chi-square test for the associ­ation between the cephalometric variables and degree of AHI score severity. Fisher exact test was used to compare age and sex difference in the groups. The partial correlation analysis was used to evaluate the influence of age on the relationship between AHI and skeletal and upper airways variables. A value of P<0.05 was considered significant. Statistical analyses were performed with a statistical pack­age (SPSS software, IBM, Armonk, New York, USA).

RESULTS 

The OSA group included 22 children (13 males, 9 fe­males; mean age 8.8±1.8 years). The control group con­sisted of 20 subjects without OSA (10 males, 10 females; mean age 9.2±1.7 years) matched for age, sex, and maloc­clusion classification.

For the lateral cephalometric measurements, interreli­ability was intraclass correlation coefficient = 0.99 (95% confidence interval 0.984, 0.996).

Each group was further subdivided based on skeletal profile (class II and III malocclusion). In the OSA group, 11 children (8 males, 3 females; mean age 8.5±2.0 years) had a class II malocclusion and 11 children (5 males, 6 fe­males; mean age 9.1±1.6 years) a class III malocclusion. In the control group, 10 children (5 males, 5 females; mean age 8.8±1.7 years) had a class II malocclusion and 10 chil­dren (5 males, 5 females; mean age 9.3±2.0 years) a class III malocclusion.

AHI-Based Results

Sleep-based results revealed mean AHI of 6.7±3.7 events per hour, mean oxygen desaturation index 1.76±1.79%, mean SaO2 97.4±1.0%, mean nadir O2 91.4±5.4% and mean O2 desaturation 3.7±1.4%. In the OSA group 13 children (60.7%) had an AHI >5 events/h and 9 children (39.3%) had an AHI <5 events/h. In the sub­group of AHI >5 events/h there were 5 children with class II malocclusion and 8 children with class III malocclusion, whereas in the AHI <5 events/h group there were 6 children with class II malocclusion and 3 with class III malocclu­sion.

A statistically significant difference was observed only for Go-Me and Ba^SN dimensions when children with OSA were grouped for AHI >5 events/h or <5 events/h (P = 0.029 and P = 0.026, respectively). For the Go-Me and Ba^SN dimensions the smaller values were observed in children with AHI <5 events/h (around 4.5 mm and 4°, re­spectively). Only ANS-PNS was significantly increased in the class II malocclusion sample according to OSA severity (around 3.5 mm; P =0.03). (Appendix IV) Finally, there was no significant difference for any variables among class III malocclusion based on OSA severity (Appendix V).

Skeletal Results

A significant decrease in the angle between palatal plane and anterior cranial base (PP^SN) was evident in children with OSA compared to the control patients (7.55±2.04 vs. 9.80±2.91; P = 0.006) (Table 1). However, this reduction was statistically significant only in children with OSA with class II malocclusion compared to the class II control group, but not in class III malocclusions (Tables 2 and 3). Although a reduction of PP^SN was observed in both OSA class II and III malocclusions, the difference was not significant (7.18±1.72 vs. 7.54±2.46; P >0.05). The an­gle of the flexure of cranial base (Ba^SN) was reduced in children with OSA when compared to control patients (129.68±4.21 vs. 132.0±3.46; p = 0.05). (Table 1) This re­duction was only present in class II malocclusion (Table 2). No statistically significant difference was found when mean values were compared in OSA class II and III maloc­clusions (129.72±2.57 vs. 130.45±5.44; P >0.05). No sig­nificant differences were observed for other skeletal varia­bles between children with OSA and the control group.

Upper Airway Results

Total lower sagittal depth of the bony nasopharynx (PNS-Ba) was significantly reduced in the OSA group when compared to the control group (40.32±2.81 vs. 42.33±3.38; P = 0.043) (Table 1). This variable decreased only in class III malocclusion compared to controls (40.36±2.76 vs. 43.55±3.18; p =0.024). (Tables 2 and 3) No difference was found when mean values were com­pared in OSA class II and III malocclusions (40.36±2.97 vs. 40.36±2.76; P > 0.05). The upper adenoid thickness (AD2H) was increased in the OSA group when compared to the control group (17.41±3.59 vs. 14.35±2.92; P =0.005) (Table 1). The increase was evident only in OSA class II malocclusion compared to the control group (Tables 2 and 3). No significant difference was noted between OSA class II and III malocclusions (16.54±3.77 vs. 17.81±3.7; P >0.05). The minimal distance between the upper soft palate and the nearest point on the posterior pharynx wall (McNamara upper pharynx dimension) was significantly reduced in the OSA group when compared to that of the control group (9.91±2.65 vs. 11.93±2.34; P = 0.01) (Table 1). This variable decreased only in class II when compared to that of the control group (9.27±2.83 vs. 11.40±1.77; P = 0.05) (Table 2). No difference was found when mean val­ues were compared in OSA class II and III malocclusions (9.27±2.83 vs. 10.72±2.45; P >0.05).

Correlation Analysis

Because correlation with AHI index may be caused by the common dependence on age, it is important to eliminate this confounding factor. Skeletal and upper airway cepha­lometric measurements were correlated with age in the OSA group. Some upper airway variables (PNS-AD1, PNS-Ba, PNS-AD2 and AD2H) resulted in correlation with age (around r = 0.5; all P <0.03). In addition, a low but significant positive correlation was observed between AHI and age (r = 0.38; p =0.04). AHI value was not strongly correlated with any skeletal and upper airway var­iables in the OSA group (Appendix VI). There was also no correlation between AHI in children with class II and III malocclusion for both skeletal and upper airways measure­ments.
 
 
Figure 1

Representation of cephalometric skeletal and soft-tissue variables.
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Table 1

Comparison between OSA group and controls.
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Table 2

Comparison between OSA Class II group and controls.
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Table 3

Comparison between OSA Class III group and controls.
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DISCUSSION

The results suggest that differences in prevalence for some cephalometric variables existed between children with and without OSA. Those altered features are not nec­essarily similar to those reported in previous systematic re­views.6,10

In contrast to other studies,15 the current study did not suggest a significant difference between many cephalo­metric variables in patients with and without OSA. It has been reported10 that SNB and ANB appeared to showcase that mandibular retrusion was associated with OSA in pe­diatric patients. However, the reliability of these variables as indicators of sagittal maxillary and mandibular position is directly affected by vertical SN pitch and horizontal SN length.16 Moreover, a short SN measure for anterior cranial base length has also been reported in children with OSA.17 Consequently, a short cranial base could incorrectly show normal ANB, SNA, and SNB values despite the presence of mandibular retrusion.10 For this reasons, in addition the Wits index was applied to have further agreement of sagit­tal skeletal discrepancy in case that ANB measurements were ineffective in assessing the real intermaxillary rela­tionships.18 Flores-Mir et al.10 stated that most of selected studies had various methodologic deficiencies and lack of appropriate control group. In this study, the two groups of children were matched based on skeletal craniofacial char­acteristics and the only difference was the pres­ence/absence of OSA. It seemed that making an overlap between the two groups of patients regarding their basic skeletal characteristics could be methodologically more correct, avoiding differences in skeletal variables only be­cause of an erroneous sampling of the control group. Therefore, the absence of statistically significant differ­ences between sagittal skeletal variables in the groups of children was expected and related to comparable skeletal changes already present in basal conditions and secondary to malocclusion. The lack of vertical skeletal differences may indicate that, at least for some skeletal variables, the presence of OSA may not further change the skeletal mor­phology in patients with class II and III malocclusions. Moreover, the absence of any meaningful correlation with OSA severity may indicate that craniofacial morphology may not represent a clear pathway in the development of OSA. Hence, clinicians should be careful in only consider­ing the OSA potential in children with the “adenoidal face” because this may still present a significant degree of OSA.

The identified correlation between AHI and age should be carefully considered. It has been previously re­ported that the severity of OSA tends to increase over time. Children with untreated OSA can exhibit serious morbidity in physical growth and development.19

In regard to the maxilla inclination, in this study it was significantly decreased in children with OSA, particularly those with class II malocclusion, indicating that the maxilla was inclined upward, whereas the anterior cranial base in­clination appeared normal. Similar results were reported by Zettergren-Wijk et al.19 in children with OSA, speculating that the reduction of this angle may be influenced by the sleep breathing problem. No significant correlations be­tween maxilla inclination and AHI severity were found.

An interesting observation was that children with OSA trended toward a less obtuse cranial base flexure an­gle, mainly in class II malocclusion. Steinberg et al.20 ob­served that adults with OSA “tended to have a more acute cranial base flexure angle compared to patients without” OSA regardless of malocclusions. In particular, “patients with class III tended to have a more acute cranial base flex­ure angle than those with class I or II”.  In the children with OSA in the current study, this reduction was evident in both class II and III malocclusions but with a significantly lower value in OSA Class II. Özdemir et al.21 found a statistically significant negative correlation between skull-base angle and AHI score and found that in patients with severe ob­struction the reduction of this angle was caused by a reduction of the bony limits of nasopharyngeal space. In addi­tion, they stated that excessive cranial-base flexure could play a role in the development of OSA. No significant cor­relation between skull-base angle and AHI score was found.

Regarding the upper airway profile, children with OSA have a reduced anteroposterior airway width located at the level of the lower bony nasopharynx, superiorly at the level of the upper adenoidal mass and in the upper phar­ynx. Although the reduction of the upper airway width was evident in children with OSA, it is important to note that no difference was found between children with and without OSA in class II and III malocclusions.22, 23 As a conse­quence, it can be presumed that the upper airway width may be reduced regardless of the sagittal malocclusion, ap­pearing to be more influenced by changes in soft palate and adenoidal mass. Another hypothesis could be that in both class II and III malocclusion the maxilla is size deficient. Furthermore, we failed to show any correlation between upper airway width and AHI severity. Our results are sup­ported by the observation of de Freitas et al.,17 who noted no association between class I or II malocclusion and phar­yngeal airway dimensions, inferring that malocclusion type does not influence pharyngeal airways width. Alves et al.,24 in a three-dimensional cephalometric study from CT scans in adults with normal nasal breathing presenting with class II and III skeletal patterns, also noted that most of the air­way measurement has not been affected based on maloc­clusion.

Upper airway dimensions assessed on lateral cepha­lometry did not show significant changes in growing chil­dren, suggesting that the airway dimensions are mainly es­tablished in early childhood and remain mostly stable.25 Furthermore, modifications regarding the angle of inclina­tion of the anterior cranial base and the bony nasopharyn­geal depth has been reported to have significant influences on breathing in patients with OSA. Indeed, a more obtuse cranial base flexure angle seems to lead the posterior phar­yngeal wall attachment more posteriorly, thus improving the airway diameters.21 Our OSA sample also showed a less obtuse cranial base flexure angle, particularly in class II malocclusions, and a reduced total lower sagittal depth of the bony nasopharynx. Although no relationship was evi­dent between upper airway variables and AHI severity, it is possible to suppose that this skeletal condition could be an additional risk to the development of OSA.

Limitations

In the statistical analysis the significance level was set at 0.05. However, if the value of P was corrected for mul­tiple comparisons, it could be argued that considering the number of multiple t tests, the discerning value of P should have been set at P =0.0017; then none of the differences would be likely statistically significant.

The radiographs were obtained while patients were awake and in an upright position for assessing craniofacial and upper airway morphology. However, it is uncertain whether the orientation difference has a negligible effect on children with sleep-disordered breathing and whether the upper airway measurements are affected by the state of consciousness.6,26

Another limitation is that direct visualization by a physician still remains the gold standard for airway assess­ment and lateral cephalometry has poor sensitivity but high specificity.27 However, two-dimensional radiographic evaluation can still be considered a reasonable screening tool to be supported with appropriate follow-up.28

As explained previously, a negative PSQ was consid­ered a proxy for a negative nPSG. The use of an AHI of 5 events/h as cutoff point can be challenged, because there is no universal consensus.

Furthermore, sexual dimorphism and genetic and en­vironmental factors were not considered in our analyses.

Finally, the evaluation of naso-oropharyngeal upper airway features on lateral cephalometric does not imply im­provement in nocturnal breathing function.

CONCLUSION 

The OSA sample showed some distinct craniofacial features compared to a nonlikely OSA group. These differ­ences were not consistently located when sagittal maloc­clusion was considered.

 

REFERENCES

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SUBMISSION & CORRESPONDENCE INFORMATION

Submitted for publication February 11, 2019
Submitted in final revised form April 17, 2019
Accepted for publication May 18, 2019
 
Address correspondence to: Letizia Perillo, DDS, MS, PhD, Orthodontic Program, Multidisciplinary Department of Medical-Surgical and Dental Specialties, University of Campania Luigi Vanvitelli Via Luigi De Crecchio 6, 80138 Napoli, Italy; Email:  letizia.perillo@unicampania.it; letizia.perillo@gmail.com; Phone:  +39 081 5665495 / 5501

DISCLOSURE STATEMENT

The authors have no conflicts of interest to disclose.

APPENDICES

 
 
Appendix 1

Definitions of the cephalometric linear and angular measurements.
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Appendix 2

Definitions of the cephalometric measurements of the upper airways.
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Appendix 3

Comparison between AHI>5/AHI<5 and skeletal and upper airway variables.
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Appendix 4

Comparison between AHI>5 /<5 and cephalometrics in OSA Class II.
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Appendix 5

Comparison between AHI>5/<5 and cephalometrics in OSA Class III.
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Appendix 6

Correlation among OSA variables and AHI Index.
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