Computure Aided Surgical Simulaiton Flashcards
In the US it is estimated that ___ individuals aged 12-50 years (__% of the population) have malocclusions that are severe enough to warrant surgical correction
17 million
18%
The most common congenital anomaly includes cleft lip and palate (___ per 1000 live births, depending on ethnicity), craniosynostosis (___ per 1 milllion live births), and hemifacial microsomia (1 per ____ live births)
0.3-3.6
343-476
5600
The incidence of head and neck cancer in the US is ___ per 100,000, which translates into 28,000 new patients every year, a figure that doesn’t not include an even larger number of patients with benign tumors who may also require surgery.
9.7
__-__% of the population is reported to have symptoms of TMD with peak prevalence in individuals aged __-__
5-15%
20-40
In general, current surgical planning methods for complex CMF deformities involve what 3 steps?
Gather data from many sources (physical exam, photos, imaging studies, plaster dental models.
Simulate the surgery (prediction tracings, dental model surgery, CT-based physical model surgery
Create a way of transferring the surgical plan to the pt at the time of surgery (surgical splints, templates, measurements of bone movements, visual clues)
The ADA council on scientific affairs recommends that ___ should only be considered as an adjunct to standard oral imaging modalities
CBCT
True or false.. a CBCT results in less radiographic exposure than the combined radiation dose of a lateral ceph, pano, and FMX.
False but may true. There is no conclusive evidence to fully support these views
Comparison of cephalometric measurements form 3D reconstructed images with conventional 2D images seems to yield ___ results
Contradictory
True or false… computer-aided 3D cephalometric measurements are more accurate and easier to interpret than 2D (ceph)
True. However generation of cephalometric information from a CBCT scan requires a full-size FOV, thereby exposing the patient to higher risk of radiation.
True or false.. currently there are no studies investigating how much the diagnosis and treatment planning of an individual would actually differ with the use of 3D methods as compared to conventional cephalomgrams
True. However, this information would be very useful.
True or false.. CBCT-generated models lack fine details such as occlusal pits and fissures.
True.
Thus, currently, CBCT-generated models cannot be accepted
Studies that compare the lateral cephalometric radiographs with CBCT scans for the measurement of airways present ___ correlations
Weak
Measurements of airway volume made on CBCT scans show far more variability than the measurements of corresponding airway are performed on lateral head radiographs.
Additionally, 3D images of the airway allow for a better view and improved evaluation in individuals with severe skeletal and craniofacial anomalies with comorbidities (such as OSA) should not be made on 2D radiographs. CBCT scans enhance the diagnosis and treatment planning.
Perhaps the most important outcome that was found through CBCT evaluation of RME, is that orthopedic expansion is not only limited to the mid-palatal suture. Where else does it occur?
In the network of sutures around the maxillary and zygomatic bones
What are some bad side-effects of maxillary expansion?
Dental tipping and related alveolar changes that may exceed desired levels
Marginal bone loss, buccal fenestrations, and gingival problems may also occur
The periodontal consequences of RME in the permanent dentition emphasize the importance of early intervention
Heavily ___ directed forces produce significantly more root resorption than light forces
Buccally
