ABSTRACT
Aim:The purpose of this study was to comparatively evaluate the validity of Golden Proportion, Recurring Esthetic Dental (RED) proportion and Golden Percentage in maxillary anterior teeth in population of Himachal Pradesh.Methods and Materials:Dentulous stone casts of maxillary arch were made of the subjects who met the inclusion criteria. Conditions for inclusion criteria included that the individuals:1) should be of Himachaliorigin with agreeable smiles 2) have well aligned anterior dentition 3) should be between age group of 20-40 years Total of 200 students representing Himachal Pradesh population were included. Measurements were done for the spaces in the grids using the digital caliper. Results:1)The Golden Proportion ratio of 1.3 and 1.4 were more commonly observed in 27.5% and 40% respectively than 1.618 which was observed in 5.5% under study of the population. 2)A Paired sample t-test showed there was no significant gender based difference in Lateral/Central incisor Red Proportion.(P-value>0.05) except for the Canine/Lateral Red Proportion. (P-value<0.05). 3)The Golden Percentage for males in central and lateral incisors and canine was 22.48%, 15.96% and 11.08% respectively. The mean value for females in central and lateral incisors and canine was 22.72%, 16.25% and 10.97% respectively. Conclusions:Golden percentage could be used for aesthetic correction and was found to be more applicable in the population included in this study. Golden percentage could be used for aesthetic correction and are more applicable to natural dentition in the population of Himachal Pradesh.
ABSTRACT
Introduction: Abundant resources and techniques have been used for complete coverage crown fabrication. Conventional investing and casting procedures for phosphate-bonded investments require a 2- to 4-h procedure before completion. Accelerated casting techniques have been used, but may not result in castings with matching marginal accuracy. Aims and Objectives: The study measured the marginal gap and determined the clinical acceptability of single cast copings invested in a phosphate-bonded investment with the use of conventional and accelerated methods. Materials and Methods: One hundred and twenty cast coping samples were fabricated using conventional and accelerated methods, with three finish lines: Chamfer, shoulder and shoulder with bevel. Sixty copings were prepared with each technique. Each coping was examined with a stereomicroscope at four predetermined sites and measurements of marginal gaps were documented for each. Statistical Analysis: A master chart was prepared for all the data and was analyzed using Statistical Package for the Social Sciences version. Evidence of marginal gap was then evaluated by t-test. Analysis of variance and Post-hoc analysis were used to compare two groups as well as to make comparisons between three subgroups . Results: Measurements recorded showed no statistically significant difference between conventional and accelerated groups. Conclusion: Among the three marginal designs studied, shoulder with bevel showed the best marginal fit with conventional as well as accelerated casting techniques. Accelerated casting technique could be a vital alternative to the time-consuming conventional casting technique. The marginal fit between the two casting techniques showed no statistical difference.