- Evaluation of the Effect of Age, Gender, and Skeletal Class on the Dimensions of Sella Turcica Using Lateral Cephalogram. [Journal Article]
- CCContemp Clin Dent 2018 Apr-Jun; 9(2):195-199
- CONCLUSIONS: There was no statistically significant difference in linear dimensions or morphological variations with age, gender, or type of malocclusion.
- Evaluation of the influence of patient positioning on the reliability of lateral cephalometry. [Journal Article]
- RMRadiol Med 2017; 122(7):520-529
- Two-dimensional cephalometry is widely used for monitoring orthodontic treatments and for quantifying the outcome of maxillofacial surgery. Despite careful use of a cephalostat, successive radiograph…
Two-dimensional cephalometry is widely used for monitoring orthodontic treatments and for quantifying the outcome of maxillofacial surgery. Despite careful use of a cephalostat, successive radiographs might differ due to slight differences in patient posture. This study evaluates the reliability of lateral cephalometric measurements and estimates the impact of patient positioning on this reliability. We studied cephalograms of 104 patients; 31 of them had two radiographs because the first was deemed unsuitable for cephalometric analysis. Using AudaxCeph 3.0 (Audax, Ljubljana, Slovenia), two observers traced each cephalogram twice, one month apart. We evaluated intra- and interobserver agreement via Bland-Altman analysis, intraclass correlation coefficient (ICC), standard error of measurement, and smallest detectable difference (SDD). First, we studied the reliability of the hard tissue part of the Tweed-Merrifield analysis for 73 single cephalograms and for the better ones of patients with two exposures. Then, we studied 31 unsatisfactory cephalograms, and the ones recorded at improved patient posture. Although intraobserver bias was less than 0.5° or 0.3 mm, interobserver bias was significant for most measurements. Intraobserver reliability was high (ICC > 0.9), whereas interobserver reliability was good (ICC > 0.83) except for FMPA, FMIA and OP. Head rotations and inclinations had little impact on reliability (e.g., interobserver SDD decreased for 3 of 11 measurements). We conclude that averaging the positions of bilateral structures enables a reliable cephalometric analysis in spite of imprecise patient posture. Retaking cephalograms is ethically questionable in such cases.
- Why WITS? Why not a way beyond? [Journal Article]
- CCContemp Clin Dent 2014; 5(4):518-23
- CONCLUSIONS: The horizontal appraisal method proposed eliminates the demerits of the occlusal plane and has the merits of simplicity and accuracy in comparison to WITS appraisal.
- Validation of anatomically shaped cranial collimation (ACC) in orthodontic lateral cephalography. [Journal Article]
- DRDentomaxillofac Radiol 2014; 43(3):20130396
- The use of an anatomically shaped cranial collimator (ACC) to reduce patient dose in orthodontic lateral cephalography was investigated in this study. The aim was to evaluate the potential interferen…
The use of an anatomically shaped cranial collimator (ACC) to reduce patient dose in orthodontic lateral cephalography was investigated in this study. The aim was to evaluate the potential interference of the ACC on landmark identification for orthodontic cephalometry. Consecutive orthodontic patients underwent a total of 100 cephalograms using an ACC mounted on a Veraviewepocs(®) 3D X550 (J. Morita Co., Kyoto, Japan) X-ray unit. 10 observers were asked whether the identification of 5 landmarks close to the collimated area was hindered or rendered impossible by the presence of the collimator. Of the 500 landmarks that were judged by the 10 observers, 496 (99.2%) were reported to lack hindrance. In three landmarks, a minority of the observers reported hindrance. In 1 landmark, 8 of the 10 observers reported hindrance by the collimator. In no instance did the observers state that the identification of landmarks was impossible as a result of the collimation. Application of the ACC on the cephalostat of the X-ray unit is a viable way of reducing patient dose, as it only marginally interferes with the diagnostic yield of the exposure. The need to retake images when the ACC is applied was found to be extremely low.
- The orthopaedic effects of bone-anchored maxillary protraction in a beagle model. [Journal Article]
- EJEur J Orthod 2014; 36(6):632-40
- CONCLUSIONS: Further histological studies would clarify the effects of BAMP on the mandible, especially on temporomandibular articulation.Our results, using this newly developed animal model, support the orthopaedic effects of BAMP.
- Anatomically shaped cranial collimation (ACC) for lateral cephalometric radiography: a technical report. [Journal Article]
- DRDentomaxillofac Radiol 2014; 43(1):20130203
- Lateral cephalograms in orthodontic practice display an area cranial of the base of the skull that is not required for diagnostic evaluation. Attempts have been made to reduce the radiation dose to t…
Lateral cephalograms in orthodontic practice display an area cranial of the base of the skull that is not required for diagnostic evaluation. Attempts have been made to reduce the radiation dose to the patient using collimators combining the shielding of the areas above the base of the skull and below the mandible. These so-called "wedge-shaped" collimators have not become standard equipment in orthodontic offices, possibly because these collimators were not designed for today's combination panoramic-cephalometric imaging systems. It also may be that the anatomical variability of the area below the mandible makes this area unsuitable for standardized collimation. In addition, a wedge-shaped collimator shields the cervical vertebrae; therefore, assessment of skeletal maturation, which is based on the stage of development of the cervical vertebrae, cannot be performed. In this report, we describe our investigations into constructing a collimator to be attached to the cephalostat and shield the cranial area of the skull, while allowing the visualization of diagnostically relevant structures and markedly reducing the size of the irradiated area. The shape of the area shielded by this "anatomically shaped cranial collimator" (ACC) was based on mean measurements of cephalometric landmarks of 100 orthodontic patients. It appeared that this collimator reduced the area of irradiation by almost one-third without interfering with the imaging system or affecting the quality of the image. Further research is needed to validate the clinical efficacy of the collimator.
- Do children with Wilson's disease have distinct craniofacial morphology? A cephalometric study. [Journal Article]
- IJInt J Pediatr Otorhinolaryngol 2013; 77(8):1276-9
- CONCLUSIONS: Children with WD and healthy children have approximately the same dento-maxillo-facial structures. However, increased palatal plane inclination may be a finding of WD.
- Dentofacial changes in adults: a longitudinal cephalometric study in 22-33 and 33-43 year olds. [Journal Article]
- JOJ Orofac Orthop 2012; 73(4):277-88
- CONCLUSIONS: Changes of the human facial skeleton continue in the third and forth decade of life and are significant. However, the mandibular growth rate decreases between the third and fourth decade. Men generally have a larger anterior cranial base and a larger face. These gender differences continue to increase with advanced age. The sagittal position of the jaw bases became more retrognathic in women. The reason for the altered mandibular position is also a posterior rotation of the lower jaw. In men, the mandibular inclination remains more stable.
- Relative nasopharyngeal patency index as possible objective indication for adenoidectomy in children with orthodontic problems. [Journal Article]
- IJInt J Pediatr Otorhinolaryngol 2011; 75(2):250-5
- CONCLUSIONS: Relative nasopharyngeal flow below 38% should constitute an indication for adenoidectomy, due to the exceeded adaptive capabilities of the body.
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- Comparison of common hard tissue cephalometric measurements between computed tomography 3D reconstruction and conventional 2D cephalometric images. [Journal Article]
- AOAngle Orthod 2011; 81(1):11-16
- CONCLUSIONS: The compatibility of using most of the common orthodontic examined cephalometric measurements on 3D volume rendered image was proven except for the angular measurements that included sella anatomic landmark.