• Title, Summary, Keyword: Cephalometric analysis

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A Study on Reliability of Computerized Cephalometric Analysis System (두부 방사선 규격사진 컴퓨터 분석기의 신뢰도에 관한 연구)

  • Woo-Cheon Kee
    • Journal of Oral Medicine and Pain
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    • v.19 no.2
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    • pp.47-55
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    • 1994
  • To investigate the reliability and reproducibility of the computerized cephalometric analysis system, se compared the differences of the 10 linear and 13 angular measurements by manual works and the use of computerized cephalometric analysis system. We obtained as follows : 1. There was not significant difference between maean values of 22 manual and computerized measurements. 2. There was not significant difference between mean differences of manual and computerized cephalometric analysis data taken by same examiner except facial depth, facial length and posterior facial height. 3. There was not significant difference between mean differences of two trials of the computerized cephalometric analysis data by same examiner in all measurements. 4. There was not significant difference between mean differences of the computerized cephalometric analysis data by two examiners except FMIA and IMPA. According to this result, we guess the use of computerized cephalometric analysis system is useful on diagnosis and treatment planning of othodontic patients.

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VALIDITY OF POSTERIOR ANTERIOR CEPHALOMETRIC AND 3D-CT FOR ORBITAL CANTING ANALYSIS (안와 경사의 분석을 위한 정모 두부규격방사선사진, 3D-CT의 유용성 평가)

  • Kim, Jin-Wook
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.30 no.6
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    • pp.546-553
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    • 2008
  • Purpose: The purpose of this study was to estimate validity of posterior anterior cephalometric and 3D-CT for orbital canting analysis. Materials and methods: Three trained observers classified two patients group using standardized frontal photographs of facial asymmetry patients. Group A consisted of patients with facial asymmetry and orbital canting(n=19), and group B consisted of patients with only facial asymmetry(n=43). Orbital canting was measured with line of bilateral inferior orbitale. Orbital canting measurement was done with posterior anterior cephalometric and 3D-CT. Each horizontal reference line was established by bilateral GWSO(cephalometric), FZS(3D-CT). Maxillary canting and mandibular deviation angle were also measured and analyzed with orbital canting. Results: The mean orbital canting was $3.03{\pm}1.00^{\circ}$ in Group A and $1.11{\pm}0.76^{\circ}$ in Group B in frontal photograph. The mean orbital canting was $1.20{\pm}0.74^{\circ}$ in group A and $1.22{\pm}0.65^{\circ}$ in group B by cephalometric analysis(p>0.05). In 3D-CT, orbital canting was almost paralleled with horizontal reference line. The orbital canting, maxillay canting and mandibular deviation between two groups showed no significant differences except madibular deviation in 3D-CT. Conclusion: Common analysis of posterior anterior cephalometric and 3D-CT is not valide method to evaluate orbital canting for facial asymmetry patients with orbital canting.

THE APPLICATION OF TEMPLATE CONSTRUCTED BY CEPHALOMETRIC ROENTGENOGRAMS IN HELLMAN DENTAL AGE FA WITH NORMAL OCCLUSION (Hellman 치령(齒齡) IV A 정상교합자(正常咬合者)의 두부방사선규격사진(頭部放射線規格寫眞)에 의(依)한 Template의 응용(應用))

  • Min, Byung Jin
    • The korean journal of orthodontics
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    • v.9 no.1
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    • pp.125-131
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    • 1979
  • The templates for male and female were constructed respectively by use of 36 male and 52 female cephalometric roentgenograms in Hellman Dental Age IV A with normal occlusion. The grids were drawn to show 1 standard deviation and 2 standard deviation on every reference point. 1. When the template is used for cephalometric analysis, w e can obtain comparatively accurate diagnosis even one or two refernces are distorted, because several references are used for analysis. 2. The method of using the template is simple enough to perform cephalometric analysis easily. 3. If the templates are constructed for every age and sex, we can predict the growth patterns of the patients in the period of growth.

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CEPHALOMETRIC AND NASOPHARYNGEAL ENDOSCOPIC STUDY IN PATIENTS WITH OBSTRUCTIVE SLEEP APNEA (폐쇄성 수면 무호흡증 환자에 있어서 두부방사선 계측 분석 및 인후 내시경적 연구)

  • Choi, Jin-Young;Engelke, W.
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.21 no.2
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    • pp.149-165
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    • 1999
  • The pathomechanism of obstructive sleep apnea(OSA) is not clearly elucidated. The possible mechanisms are pathologic reduction of pharyngeal muscular tonus during sleep, abnormal anatomical stenosis of nasopharyx or a combination of the above two mechanisms. It is very important to find the cause(anatomical location or pathologic dynamic change) of OSA in order to treat it. Cephalometric analysis in patients with obstructive sleep apnea is a good method for evaluating anatomical morphologic change but it cannot give any information about the dynamic changes occurring during sleep. On the contrary, nasopharyngeal endoscopy offer 3 dimensional image and information about the dynamic changes. Accordingly, these two diagnostic tools can be utilize in the diagnosis and treatment planning of OSA Cephalometric analysis of craniofacial skeletal and soft tissue morphology in 53 patients with OSA and 43 controls was performed and cephalometric analysis and nasopharygeal endoscopy were performed in 9 patients with OSA in order to come up with individualized therapy plans. Following results were obtained ; Patients with OSA showed 1. body weight gain 2. clockwise mandibular rotation 3. increased anterior lower facial height 4. inferiorly positioned hyoid bone 5. increased length of soft palate 6. decreased sagittal dimension of nasopharyx 7. increased vertical length of inferior collapsable nasopharyx 8. increased length of tongue Through cephalometric analysis and nasopharygeal endoscopy(mutually cooperative in diagnosis), 9. one can find the possible origin of OSA and make a adequate individualized therapy plan and predict accurate prognosis. Cephalometric analysis and nasopharygeal endoscopy are highly recommended as a diagnostic aid in OSA patients

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3-Dimensional analysis for class III malocclusion patients with facial asymmetry

  • Kim, Eun-Ja;Ki, Eun-Jung;Cheon, Hae-Myung;Choi, Eun-Joo;Kwon, Kyung-Hwan
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.39 no.4
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    • pp.168-174
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    • 2013
  • Objectives: The aim of this study is to investigate the correlation between 2-dimensional (2D) cephalometric measurement and 3-dimensional (3D) cone beam computed tomography (CBCT) measurement, and to evaluate the availability of 3D analysis for asymmetry patients. Materials and Methods: A total of Twenty-seven patients were evaluated for facial asymmetry by photograph and cephalometric radiograph, and CBCT. The 14 measurements values were evaluated and those for 2D and 3D were compared. The patients were classified into two groups. Patients in group 1 were evaluated for symmetry in the middle 1/3 of the face and asymmetry in the lower 1/3 of the face, and those in group 2 for asymmetry of both the middle and lower 1/3 of the face. Results: In group 1, significant differences were observed in nine values out of 14 values. Values included three from anteroposterior cephalometric radiograph measurement values (cant and both body height) and six from lateral cephalometric radiographs (both ramus length, both lateral ramal inclination, and both gonial angles). In group 2, comparison between 2D and 3D showed significant difference in 10 factors. Values included four from anteroposterior cephalometric radiograph measurement values (both maxillary height, both body height) and six from lateral cephalometric radiographs (both ramus length, both lateral ramal inclination, and both gonial angles). Conclusion: Information from 2D analysis was inaccurate in several measurements. Therefore, in asymmetry patients, 3D analysis is useful in diagnosis of asymmetry.

A STUDY ON THE CEPHALOMETRIC CHANGES BY THE DISPLACEMENT OF THE MANDIBULAR CONDYLES (하악과두 전위로 인한 두부방사선계측의 변화에 관한 연구)

  • Yoo, Ki-Whan;Kook, Yoon-A;Kim, Sang-Cheol
    • The korean journal of orthodontics
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    • v.21 no.3
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    • pp.591-601
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    • 1991
  • To determine the difference in cephalometric measurements between centric relation and centric occlusion, 60 patient-20 patients for each malocclusion group-were examined with the cephalograms in centric relation and in centric occlusion. The results are as follows: 1. There are differences in cephalometric measurements with the mandible in the two different position, and some measurements are statistically significant. 2. No clinically useful prediction may be made from cephalometric radiographs concerning the amount of mandibular deflection from centric relation to centric occlusion. 3. If, the large differences in the cephalometric measurements with the mandible in the two different position, the analysis with the cephalogram in centric occlusion is needed to be compensated with the other clinical approach.

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Cephalometric Characterstics and their Relationship to Respiratory Disturbance Indices in Snorer and Patients with Obstructive Sleep Apnea (코골이와 폐쇄성 수면무호흡증 환자의 두부규격방사선사진 상의 특징 및 호흡장애지수와의 상관관계)

  • Choi, Jae-Kap;Choi, Jung-Mi;Ahn, Hyoung-Joon
    • Journal of Oral Medicine and Pain
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    • v.26 no.4
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    • pp.369-376
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    • 2001
  • Objectives : The purposes of the study was to evaluate cephalometric characteristics in snorers and patients with obstructive sleep apnea (OSA) and to see any relationships between the cephalometric measurements and respiratory disturbance indices (RDI). Materials and Methods : Twelve snoring patients, 11 patients with OSA, and 10 normal subjects were included for the study. After taking a screening sleep study for a night to obtain RDI, $SaO_2$, and snoring index, a detailed cephalometric analysis was conducted to obtain SNA, SNB, SN-MP, IAS, MAS, SPAS, SAAS, Mn-H, and PNS-P. All the data were compared between groups. For a group including 12 snoring patients and 11 OSA patients, correlation coefficients were calculated between respiratory disturbance index and each item of cephalometric measurements. Results : The mandible and the maxilla are retropositioned. The oropharyngeal and hypopharyngeal airway is reduced in area and is a factor that could produce or enhance OSA symptoms. The hyoid bone is displaced inferiorly. The soft palate is significantly elongated. Conclusions : These data suggest that cephalometric evaluation could be useful to evaluate snoring and OSA patients, and to assist with the planning treatment for improvement of upper airway patency.

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Effective dose of cone-beam computed tomography for orthodontic analysis in pediatric patient (소아환자에서 교정분석을 위한 콘빔CT 촬영시 유효선량에 관한 연구)

  • Kim, Eun-Kyung
    • The Journal of the Korean dental association
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    • v.53 no.8
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    • pp.558-568
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    • 2015
  • Objective: The objectives of this study were to measure pediatric organ and effective doses of cone-beam computed tomography (CBCT) for orthodontic analysis and to compare them to those of panoramic and lateral cephalometric radiography, the conventional radiography for orthodontic analysis. Materials and Methods: Alphard VEGA for CBCT, Planmeca Proline XC for panoramic radiography and Orthophos CD for cephalometric radiography were used for this study. Thermoluminescent dosimeter (TLD) chips were located at 24 anatomic sites of 10-year-old anthropomorphic phantom and exposed during CBCT (C-mode; $200{\times}179mm$ FOV), panoramic and lateral cephalometric radiographic procedures at the clinical exposure settings for 10-year-old patient. Pediatric organ and effective doses were measured and calculated using ICRP 2007 tissue weighting factors. Results: Effective doses of CBCT, panoramic radiography and lateral cephlometric radiography in pediatric clinical exposure settings were $292.5{\mu}Sv$, $19.3{\mu}Sv$, and $4.4{\mu}Sv$ respectively. The thyroid gland contributed most significantly to the effective dose in all the radiographic procedures. Conclusion: Effective dose of CBCT was about 12 times to conventional radiographic procedures for orthodontic analysis in pediatric patient. The use of CBCT for orthodontic analysis should be fully justified over conventional radiography and dose optimization to decrease thyroid dose is needed in pediatric patients.

LATERAL CEPHALOMETRIC ANALYSIS OF ASYMPTOMATIC VOLUNTEERS AND SYMPTOMATIC PATIENTS WITH TEMPOROMANDIBULAR INTERNAL DERANGEMENT (악관절 내장증 환자와 정상인의 두부방사선규격사진의 분석비교)

  • Shin, Sang-Hun;Park, Sung-Jin
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.25 no.4
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    • pp.330-336
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    • 1999
  • Study of dentofacial structure relationships relative to TMJ internal derangement is required to increase the predictability of TMJ internal derangement. But few studies have been reported. The purpose of this study is to reveal any correlation of dentofacial characteristics with TMJ internal derangement by lateral cephalometric analysis. Patients were devided into two groups. (1) Symptomatic patients with TMJ internal derangement (2) Asymptomatic volunteers with no TMJ internal derangement. Twenty symptomatic patients with TMJ internal derangement(7male, 13female) were selected from our clinic and had undergone a standarized clinical examination, panorama, transcranical view, TMJ tomography. Twenty asymptomatic volunteers(9male, 11female) were selected from our clinic with no pain, no limitation of motion. All subjects had undergone lateral cephalometric analysis. The results were obtained as follows. 1. No significant difference between ID and normal group is detected in cranial base. 2. Maxilla position of ID group is located more posterioly than normal group. 3. Mandible position of ID group is located more posteriorly than normal group and facial profile is hyperdivergent. 4. Posterior facial height of ID group is less than normal group thus facial profile is hyperdivergent. The patients, as mentioned, have a high prevalance of ID thus it should be careful in TMJ ID diagnosis and treatment.

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ROENTGENO-CEPHALOMETRIC ANALYSIS ON THE TWIN (쌍생아의 X-선 두개계측학적 연구)

  • Choi Hi Sup
    • Journal of Korean Academy of Oral and Maxillofacial Radiology
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    • v.2 no.1
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    • pp.29-35
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    • 1972
  • The purpose of this investigation can be sought for studying varients between twin by the cephalometric roentgenographic technics. The author have applied Down's, Bjork and Sakamoto's technic and measured in various angulations and length of cephalometric points. The results are as follows; 1. No significantly different data were found between twin. 2. There was no differences between normality and twin.

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