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The Frontal Cephalometric Analysis – the Forgotten Perspective

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The Frontal Cephalometric Analysis – the Forgotten Perspective CONTINUING EDUCATION The frontal cephalometric analysis – the forgotten perspective Dr. Bradford Edgren delves into the benefits of the frontal analysis hen greeting a person for the first Wtime, we are supposed to make Educational aims and objectives This article aims to discuss the frontal cephalometric analysis and its direct eye contact and smile. But how often advantages in diagnosis. when you meet a person for the first time do you greet them towards the side of the Expected outcomes Correctly answering the questions on page xx, worth 2 hours of CE, will face? Nonetheless, this is generally the only demonstrate the reader can: perspective by which orthodontists routinely • Understand the value of the frontal analysis in orthodontic diagnosis. evaluate their patients radiographically • Recognize how the certain skeletal facial relationships can be detrimental to skeletal patterns that can affect orthodontic and cephalometrically. Rarely is a frontal treatment. radiograph and cephalometric analysis • Realize how frontal analysis is helpful for evaluation of skeletal facial made, even though our first impression of asymmetries. • Identify the importance of properly diagnosing transverse that new patient is from the front, when we discrepancies in all patients; especially the growing patient. greet him/her for the first time. • Realize the necessity to take appropriate, updated records on all A patient’s own smile assessment transfer patients. is made in the mirror, from the facial perspective. It is also the same perspective by which he/she will ultimately decide cephalometric analysis. outcomes. Furthermore, skeletal lingual if orthodontic treatment is a success Since all orthodontic patients are three- crossbite patterns are not just limited to or a failure. So why don’t orthodontists dimensional, they should be evaluated a narrow maxilla. Posterior skeletal lingual utilize the frontal analysis more? B. Holly three-dimensionally, and the frontal crossbites can also be the result of wide Broadbent is credited with developing analysis provides valuable information that mandibles, which are further exacerbated the cephalometric procedure in 1931 should be part of the diagnostic process1. by future, excessive lower jaw growth1. when he simultaneously took frontal and Additionally, with the increasing use of Cone True dental asymmetries can be lateral radiographs on his patients to Beam Computed Tomography (CBCT) treated by orthodontics alone. However, evaluate the craniofacial skeleton in all scans in orthodontics, a frontal analysis prior to the initiation of treatment, the three dimensions, including the posterior- should be made for all patients receiving a etiology of the dental asymmetry should anterior dimension. Interestingly, even CBCT scan; making use of the volume of be determined. If that dental asymmetry is though Broadbent took both frontal information obtained. CBCT scans provide the result of a skeletal issue, an orthopedic and lateral radiographs simultaneously, the opportunity for adjusting the orientation or surgical approach will be necessary orthodontists are generally trained to use of the patient’s head, improving the reliability because orthodontic treatment alone would the lateral cephalometric analysis on all of the cephalometric measurements, and likely result in an unfavorable outcome. patients, but only encouraged to use the simulating Broadbent’s cephalometric So, what about those skeletal frontal analysis when an asymmetry is procedure. asymmetries? It’s not uncommon for the suspected or a dental crossbite is clinically Skeletal facial asymmetries are more orthodontist to miss a skeletal asymmetry observed. Accordingly, many orthodontists the rule than the exception, and the frontal in a severely crowded and maligned rarely assess a patient with a frontal analysis is an excellent instrument to use malocclusion that only becomes obvious for their evaluation. However, skeletal after the leveling and alignment phase asymmetries are not always readily visible of treatment3. At this stage in treatment, clinically nor do skeletal lingual crossbite it may be more difficult to address the patterns reveal themselves with obvious skeletal asymmetry and, therefore, more posterior dental crossbites. It can be difficult to salvage. But, diagnosing the Bradford Edgren, DDS, MS, earned both his Doctorate of Dental Surgery, as Valedictorian, challenging to determine the presence skeletal asymmetry initially, prior to the start and his Master of Science in Orthodontics of a skeletal lingual crossbite pattern of treatment, provides informed consent to from University of Iowa, College of Dentistry. when it appears that there is a normal the patient and reduces the unintended He is a Diplomate, American Board of Orthodontics and an affiliate member of the SW Angle transverse relationship between the upper consequences of poor treatment planning. Society. Dr. Edgren has presented to numerous groups and lower jaws without a frontal analysis. Perfectly symmetrical faces are largely on the importance of cephalometrics, CBCT, and Many patients who appear to have normal theoretical concepts that seldom exist in upper airway obstruction. He has been published in AJODO, American Journal of Dentistry, as well as other transverse skeletal relationships have living organisms4. Minor facial asymmetries orthodontic publications. Dr. Edgren currently has a skeletal lingual crossbite patterns2 that are relatively common. In a study by Severt private practice in Greeley, Colorado. can negatively affect orthodontic treatment and Proffit of 1,460 patients, 34% had a X Orthodontic practice Volume 4 Number 5 CONTINUING EDUCATION Figure 1: Posterior-anterior image demonstrating right- sided lateral and vertical facial asymmetries (CBCT images taken with i-CAT [Imaging Sciences International]) clinically apparent facial asymmetry. Of the facial asymmetries that were present, the upper face was only affected in 5%, the middle third (primarily the nose) in 36%, and the lower third in 74% of cases. Vertical asymmetries were present in 41% of cases5. Moreover, facial asymmetries are more frequently associated with Class II and Class III malocclusions than with Class I malocclusions4. The frontal cephalometric analysis is useful in diagnosing skeletal asymmetries and skeletal crossbite patterns for both jaws. It is also aids in the evaluation of: occlusal cants, nasal widths, turbinate enlargements, dental arch widths, bucco- lingual angulation of first molars, angulation and position of impacted canines, location of the maxillary incisors to the skeletal midline, location of the mandibular incisors to the mandibular midline and skeletal midline, and the morphology of the maxilla and mandible. The frontal analysis can also Figure 2: Frontal cephalometric analysis demonstrating significant dentofacial asymmetry aid in determining if an off-centered dental to the right and occlusal cant midline is due to a tooth-size discrepancy, a mandibular functional shift, or skeletal dysplasia. lateral radiographic image alone does not Significant skeletal asymmetries display the degree of the lateral and vertical can be congenital, developmental, or asymmetries that could easily be passed acquired. Hemifacial microsomia is a off as poor patient positioning (Figure 3). congenital birth defect where the lower half The panoramic radiograph of the face is typically unilaterally, or rarely demonstrated a hypoplastic right ramus bilaterally, underdeveloped. This common and condyle (Figure 4). The maxillary facial birth defect, second only to clefts, canines and lateral incisors were ectopically most frequently affects the ears, mouth, erupting due to an anterior maxillary and lower jaw6. In this case, the patient constriction. has a significant unilateral dentofacial Early interceptive treatment included asymmetry to the right. Complete rapid maxillary expansion followed by upper diagnostic records were taken, including a and lower fixed appliances. Following the Figure 3: Lateral CBCT image CBCT scan, followed by lateral and frontal removal of the fixed appliances at the end cephalometric analyses. The frontal image of early interceptive treatment, a CBCT and the corresponding cephalometric scan was taken. The scan revealed an analysis demonstrate the effects of the improvement in the facial asymmetry and hemifacial microsomia on the right side of significantly improved permanent tooth the patient’s face (Figures 1 and 2). The eruption and root parallelism (Figures Volume 4 Number 5 Orthodontic practice X CONTINUING EDUCATION Figure 4: Panoramic image demonstrating a hypoplastic right condyle and ramus, and ectopic maxillary canines Figure 5: Posterior-anterior image following early inter- ceptive treatment Figure 7: Note, in the lateral radiographic image, the difference in the borders of the left and right sides of the mandible. When the borders of the mandible present this large of a difference, and the orbits are aligned, a facial asymmetry should be suspected Figure 6: Panoramic image following early interceptive treatment. The anterior maxillary constriction has been resolved, and the maxillary canines have erupted nicely 5 and 6). This patient will be monitored This case of acquired condylar until the eruption of the permanent hypoplasia was a transfer into my office. dentition is complete. Second phase She had had previous Phase I treatment, treatment will include full fixed appliances including the extraction of the maxillary first and orthognathic
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