A preliminary study to find out maximum occlusal bite force in Indian individuals.

Purpose: This preliminary hospital based study was designed to measure the mean maximum bite force (MMBF) in healthy Indian individuals. An attempt was made to correlate MMBF with body mass index (BMI) and some of the anthropometric features. Methodology: A total of 358 healthy subjects in the age range of 18-47 years (mean age = 26.66 ± 6.83) were selected following the selection criteria. Demographic details along with general physical and facial parameters such as height, weight, facial form, facial profile, arch form, and palatal contour were recorded in a predesigned proforma. The maximum bite force was recorded on both (right and left) sides using a specially designed piezoelectric transducer based device. Results: The MMBF in Indian individuals was found to be 372.39 ± 175.93 Newton (N). Males had significantly higher (P = 0.000) MMBF (448.47 ± 191.82 N) as compared to females (296.31 ± 116.79 N). Facial form (P = 0.001) and palatal contour (P = 0.000) showed a significant relationship with MMBF. Subjects having square facial form (421.34 ± 187.32 N) showed significantly higher MMBF as compared to other facial forms, that is, square tapered (358.86 ± 143.56 N; P = 0.038), ovoid (338.40 ± 163.02 N; P = 0.000) and tapered (349.22 ± 184.82 N; P = 0.028). Subjects with flat palatal contour showed significantly higher MMBF when compared to high (P = 0.002) and medium palatal (P = 0.002) contour. Though facial profile was not significantly related to MMBF, it was significantly higher in subjects having concave facial profile when compared to convex (P = 0.045) and straight (P = 0.039) facial profile. BMI and arch form showed no significant relationship with MMBF. Conclusion: The MMBF is found to be affected by gender and some of the anthropometric features like facial form and palatal contour.

The relation between idiopathic scoliosis and the frontal and lateral facial form / 대한치과교정학회지

OBJECTIVE: The purpose of this study was to evaluate the relation between idiopathic scoliosis and facial deformity in the horizontal, vertical, and anteroposterior planes. METHODS: A total of 123 female patients aged 14 years or older, who visited the Spine Clinic at the Department of Orthopedics, Korea University Guro Hospital for treatment of idiopathic scoliosis, were enrolled. Whole-spine anteroposterior and lateral radiographs were taken with the patient in a naturally erect position, and frontal and lateral cephalograms were taken in an erect position with the Frankfort horizontal line parallel to the floor. Scoliosis was classified according to the Cobb angle and Lenke classification of six curve types. Cephalometric tracing in all cases was carried out with V-Ceph 5.5 by the same orthodontist. The Kruskal-Wallis test was performed to determine whether any relation existed between each group of the idiopathic scoliosis classification and the cephalometric measurements of frontal and lateral cephalograms. RESULTS: The measurements did not reveal any significant association between the Cobb angle and cephalometric measurements and between the curve type based on the Lenke classification and cephalometric measurements. CONCLUSIONS: Based on the results of this study, no apparent relation was observed between the severity of scoliosis and facial form variations in idiopathic scoliosis patients.

Effect of the gingival display on posed smile with different facial forms: A comparison of dentists and patients concepts.

Aim: The aim of this study was to evaluate and compare the importance of amount of gingival display on smile esthetics and facial attractiveness in males and females with different facial forms by orthodontists as well as lay person. Materials and Methods: Frontal photographs of 18 male and female patients (9 male and 9 female) each, at a posed smile, seeking treatment in the Department of Orthodontics and Dentofacial Orthopedics were obtained. The photographs were divided in 3 groups based on their facial forms (Short face, Average face and Long face) and were altered by moving the dentition within the lip frame of the captured photograph to bring about different gingival display at smile. The pictures were divided into six groups with gingival exposures of 0 mm, 1 mm, 2 mm, 3 mm, 4 mm and 5 mm. The pictures were rated for attractiveness by four sets of evaluators - male and female Orthodontists and male and female lay evaluators. The statistical analysis methods used for the study included Mean score calculation, standard deviation and Analysis of variance: [test (Mono- Variance)]. The Student t test (two tailed, independent) has been used to find the significance of rating scores between lay person and orthodontist, and also between males and females evaluators. Results: No significant difference in ratings of gingival display in the 3 groups of photographs was noted by lay person and orthodontists. The results point to the fact that the influence of amount of gingival display on smile esthetics was independent of the facial form. It was also observed that gingival display of 0 mm to 2 mm was acceptable to both the lay person and the orthodontists. Conclusion: As the amount of gingival display increased, the ratings for facial attractiveness by both orthodontists and lay person decreased. Higher scores were given by both orthodontists and lay person for photographs which showed gingival display of 0-2 mm, suggesting this value to be most acceptable.

Facial form analysis of the lower and middle face in young Korean women

Nowadays facial skeletal contouring which have developed in craniofacial surgery, acquired popularity in aesthetic surgery. On planning aesthetic surgery, patient's desire must be considered first but it seems to be essential to have an objective standard of facial form. Anthropometric analysis, cephalometric analysis, and photogrammetric analysis were developed for this purpose but with a limitation in three dimensional analysis. Barnett and Whitaker(1986) developed a simple three dimensional analytic system of middle and lower face and reported average values and standard deviations for young Caucasian women. We performed the same analysis for age matched young Korean women and found some difference between young Caucasian women and young Korean women as follows; 1. Young Korean women's middle and lower face is wider than young Caucasian women's face in horizontal dimension. 2. Young Korean women's middle and lower face is shorter than young Caucasian women's face in anterior-posterior dimension. 3. The difference in vertical dimension between the two groups is minimal. 4. In angular relationship, young Korean women's anterior and inferior angles are larger than young Caucasian women's angles. These findings are coincident with other author's observations that Oriental face is wider and rounder than Caucasian face and Orientals have more prominent malar area and mandible angle. For Korean people, with many needs for aesthetic correction of prominent zygoma and mandible angle, this three dimensional analytic system will be useful in planning surgery and research for middle and lower face deformities.

Facial form analysis of the lower and middle face in young Korean women

Nowadays facial skeletal contouring which have developed in craniofacial surgery, acquired popularity in aesthetic surgery. On planning aesthetic surgery, patient's desire must be considered first but it seems to be essential to have an objective standard of facial form. Anthropometric analysis, cephalometric analysis, and photogrammetric analysis were developed for this purpose but with a limitation in three dimensional analysis. Barnett and Whitaker(1986) developed a simple three dimensional analytic system of middle and lower face and reported average values and standard deviations for young Caucasian women. We performed the same analysis for age matched young Korean women and found some difference between young Caucasian women and young Korean women as follows; 1. Young Korean women's middle and lower face is wider than young Caucasian women's face in horizontal dimension. 2. Young Korean women's middle and lower face is shorter than young Caucasian women's face in anterior-posterior dimension. 3. The difference in vertical dimension between the two groups is minimal. 4. In angular relationship, young Korean women's anterior and inferior angles are larger than young Caucasian women's angles. These findings are coincident with other author's observations that Oriental face is wider and rounder than Caucasian face and Orientals have more prominent malar area and mandible angle. For Korean people, with many needs for aesthetic correction of prominent zygoma and mandible angle, this three dimensional analytic system will be useful in planning surgery and research for middle and lower face deformities.