Comparative Cephalometric Analysis of Angle Class II Division 1 Malocclusion Between Nepalese and Chinese Subjects (original) (raw)
Related papers
Craniofacial Morphology of Class II Division 1 Nepalese Population
Medical Journal of Shree Birendra Hospital, 2013
Introduction: Class II Div 1 is a deviation from normal occlusion and may arise from combination of di" erentcraniofacial components.The objective of this study was to findnd out the different possible dental and skeletalcomponents that lead to Class II Div 1 malocclusion in Nepalese population.Methods: The lateral cephalogramradiographs consisted of 30 males and 30 females between the age group of 18 to 32 years. All the radiographswere traced with hand on acetate paper sheets. All the landmarks were identified, located and marked. Steiner’s analyses and McNamara analysis were done for the cephalometric measurements. The mean valueswere obtained and were compared with the established available values of the Nepalese and Caucasian normsusing independent t-test.Results: Size of the mandible was found to be lesser than the established normalvalues. Prognathic maxilla with retrognathic upper incisors and retrognathic mandible with proclined lowerincisors and was found to be the mo...
2015
Introduction: Class II Division 1 malocclusion is where the maxillary teeth are proclined and the molars are in disto-occlusion. In this study I have described and compared the dento-skeletal characteristics cephalometrically associated with Angle's Class II Division 1 malocclusion in a population living in Chitwan district of Nepal Materials and methods: 20 lateral cephalograms of children(10 males and 10 females) in the age range of 7-13 years from local schools of Chitwan with Class II, division 1 malocclusion were analyzed. Age range of the representing children was 7-13 years. Results: The maxilla was prognathic in relation to anterior cranial base in Class II Division 1 patyients. Maxillary and mandibular incisors were proclined. Between the two groups, the cranial base angle was same. There was a significant reduction in interincisal angle. Conclusion: In the Chitwan region of Nepal, Class II division 1 malocclusion has specific characteristics. Steiner's norms are no...
Cephalometric Characteristics of Bangladeshi adults with Class II Malocclusion
This study evaluating the craniofacial characteristics of Bangladeshi adults with class II malocclusion in order to frame cephalometric angular and linear measurements and to relate their mean differences with the established values of class I Bangladeshi adults' cephalometric norms. Fifty (50) standardized lateral cephalometric radiographs of Bangladeshi adults including 25 males and 25 females with an average age of 20 years were studied. The conditions of selection were Class II incisor relationship with or without crowding, no deformity and no previous orthodontic treatment. All cephalometric landmarks were located and determined and subsequently tracings were done to execute cephalometric analysis. The results of the existing study revealed, there is no statistically significant difference between the genders on all measured values. Bangladeshi males showed larger values than those of the Bangladeshi females in most of the variables. Mean values of cephalometric norms of Bangladeshi adults were very much different than the Class I malocclusion adults.The reading should be kept in attention for this group separately as it varies from the class I Malocclusion.
Journal of Orthodontic Research, 2014
Background: Facial harmony in orthodontics is determined by the morphologic relationships and proportions of the nose, lips and chin. For the correction of all malocclusions, the facial outlines should be regarded as an important guide in developing a proper treatment plan. Aims and Objectives: (1) The primary aim is to evaluate and compare the soft tissue pattern associated with Angle's Class I normal occlusion and Angle's Class-II Division-1 malocclusion in North Indian adult population. (2) The secondary is to access sexual dimorphism for the soft-tissue characteristics. Materials and Methods: Lateral cephalograms of 80 orthodontically untreated adult subjects, 40 were having normal occlusion with good facial profile (Group-A: 20 males-mean age 22.89 years and 20 females-mean age 21.27 years) and 40 subjects with Angle's Class-II Division-1 malocclusion (Group-B: 20 males-mean age 20.25 years and 20 females-mean age 19.67 years) were analyzed. Methodology: Lateral cephalograms of the subjects were taken in natural head position and were traced manually. 16 linear and 6 angular soft-tissue parameters were measured which were derived from the Steiner, Ricketts, Burstone and Holdaway soft-tissue analyses. All the values were compared using Student's t-test with a level of significance at P < 0.05. Results: Group-B males had decreased lower lip length, lower face height, nasomental angle (P < 0.001) and lip length ratio (P < 0.01) whereas increased interlabial gap, upper lip to Sn-Pg', total facial contour angle, maxillomandibular contour angle (P < 0.001), lower lip to Sn-Pg' angle (P < 0.01) when compared to Group-A males. There was an apparent sexual dimorphism was found in soft-tissue pattern of both the groups. Conclusions: Class-II Division-1 malocclusion have more convex soft-tissue profile, reduced nose length, Shorter procumbent lips and flatter chins when compared to Angle's Class I malocclusion.
IOSR Journals , 2019
Aim: To evaluate the perioral soft tissue characteristics of skeletal Class II Division 1 subjects (group II) with various vertical patterns compared with skeletal Class I subjects (group I).in himachali population. Material and Methods: Lateral cephalograms of 100 adults (60 women, 40 men; age range 18-50yrs) were divided into 4 groups based on horizontal and vertical skeletal pattern (SN-MP angle): group I, 25 subjects; group II-low angle (<27°), 25 subjects; group II-normal angle (27°-36°), 25 subjects; and group II-high angle (>37°), 25subjects. The correlations and multiple linear regression tests were used to determine the skeletal and dental variables influencing soft tissue characteristics. Results: Group II-high angle showed significantly greater values than did group II-low angle for basic lower lip thickness and lower lip length. The perioral soft tissue measurements of group II were correlated with the inclination and anteroposterior position of the maxillary and mandibular incisors along with facial depth (N-Go) and facial length (S-Gn). Upper lip strain of group II was not influenced by any skeletal variables but only by the inclination and anteroposterior position of the maxillary incisors. Conclusions: It is important to evaluate lip strain and lip thickness based on the skeletal pattern as well as dental inclination to obtain balance in the perioral muscle activity.
Journal of Hard Tissue Biology, 2008
Angle class III malocclusion are very hard to treat only by orthodontic method for most adults. So in this study we have measured The mesio-distal tooth size and arch length on the dental casts of total 39 pairs (17Chinese,22Nepalese) of Angle class III malocclusion, Upper lateral incisor, upper canine and upper second premolar shows significant difference between Nepalese and Chinese (P=0.02, P=.01, P=.003). Lower teeth show no significant difference between Nepalese and Chinese. Among Nepalese male and female lower lateral incisors, second premolar molar show significant difference (P=0.035, P=0.032, P=0.049), second premolar shows significant difference between Nepalese male and female (P=0.020). Among Chinese male and female shows no significant difference between upper teeth while lower first molar shows significant difference (P=0.041, P=0.00). For Nepalese OR 90.42 and AR 78.76 while for Chinese OR 89.58 and AR 78.16. No significant difference between Chinese and Nepalese OR and AR. Upper arch length for Nepalese male and female having angle class III malocclusion are 79.5 and 77 respectively. Lower arch length for Nepalese male and female with Angle class III malocclusion are 73.8 and 69.25. Among Nepalese upper arch length between male and female (P<0.05) shows significant difference but no significant difference between male and female in lower arch length (P>0.05). For Nepalese male the space lack for upper jaw is 3.7mm and for lower jaw 6.6mm.
Journal of Contemporary Orthodontics
Aim-Purpose of this study is to compare the validity of different cephalometric angles like Beta, Yen, Pi and W angle for evaluating sagittal jaw dysplasia in Skeletal Class I and Class II malocclusion among Bhopal population and to obtain most reliable parameter for orthodontic diagnosis. Material and Method-120 pretreatment lateral cephalograms were selected on the basis of inclusion criteria and were divided into 2 groups (n= 60) i.e. Skeletal Class I and II on the basis of ANB Angle and Wits Appraisal between ages of 16-35 years which further subdivided into Male and Female (n=30). Landmarks were located, traced and analyzed. Results-There was statistically highly significant difference found for cephalometric parameters in Skeletal Class I and Class II Malocclusion. (p=0.001) Mean value of ANB angle was 1.917±1.37 and 6.292±1.27, Wits was-0.742±3.02 and 3.442±2, Beta angle was 31.692±4.41 and 24.125±5.60, Yen angle was 123.28±3.47 and 117.16±4.47, Pi angle was-0.658±3.37 and 4.817±3.14 and W angle was 55.792±2.61 and 52.017±3.34 among Skeletal Class I and II groups respectively. Yen angle (91.67 % & 76.67 %) and Pi angle (90.00 % & 71.67 %) had high sensitivity and specificity to discriminate between Class I & II. Cut off value was ≤ 3for Pi and >119 for Yen angle. Conclusion-Yen Angle is the most accurate and reliable parameter to differentiate between Skeletal Class I and Class II Groups with highest sensitivity and specificity followed by Pi Angle.
Update Dental College Journal
Background: The term "Class II malocclusion" encompasses a range of dental and skeletal characteristics, making precise diagnosis and treatment planning challenging. This study aimed to examine 32 Bangladeshi patients with Class II malocclusion to evaluate maxillary and mandibular skeletal positions using cephalometric measurements commonly used in clinical practice. Methods: Study casts and lateral cephalograms of 32 patients (17 females and 15 males) with Class II malocclusion were analyzed. Inclusion criteria comprised Class II molar relationship, the absence of craniofacial deformities, and no previous orthodontic treatment. Cephalometric measurements included SNA, SNB, and ANB angles, and data were analyzed using SPSS software. Results: Among the patients, 53% exhibited maxillary skeletal protrusion, 43% had mandibular retrusion, and only 3.1% presented both maxillary protrusion and mandibular retrusion. Surprisingly, 31.2% showed maxillary skeletal retrusion, and 28....
Orthodontic Journal of Nepal, 2019
Introduction: Cranial Base integrate different patterns of growth in various regions of the skull such as the nasal cavity, the oral cavity, and the pharynx. Anteroposterior jaw position is thought to be affected by cranial base growth. Although scientific literature shows conflicting results regarding both positive and negative correlation between the cranial base and skeletal malocclusions. Materials & Method: 138 patients selected according to the Inclusion criteria were divided into three major categories depending upon ANB angle. Class I, class II group and class III group. Pretreatment lateral cephalometric radiographs were taken. Linear and Angular measurements were measured. All the data was entered in SPSS version 25 and then analyzed by using descriptive statistics including mean, standard deviation and by using inferential statistics including Pearson correlation and ANOVA test. Result: No significant differences were recorded between cranial base deflection angles (N-S-...