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Project

Post-orthodontic stability: what are we missing?

OBJECTIVES: 1. To understand how untreated human occlusions evolve at different ages and which are the ethnic variations taking into consideration the different occlusal and craniofacial patterns. 2. To compare the untreated samples with those of treated orthodontic cases which will determine if any diagnostic guidelines or preventive interventions can eliminate or subside the need for retention. METHODOLOGY: The study design provisionally considered is a cross sectional study. The occlusion of the subjects included in the study will be studied through intra and extraoral photographs, models and lateral cephalograms, both from untreated and treated patients. The facial pattern will divide the samples further as vertical and horizontal growth pattern. There will be consideration of gender and age difference among both groups during data collection. The dataset will be divided accordingly, keeping the difference in group size to be minimal so that a normal distribution is seen and reduce the chances of peak evolution criteria in a single group. For the first part of the study, collection and study of an untreated sample will be performed. Inclusion criteria: · Availability of cast models, intra and extraoral pictures and panoramic and lateral cephalograms · Angle classification of Class I malocclusion. · Overjet of 1.5mm and overbite 1.5-2mm. · Class I canine relationship · Class I molar relationship · Occlusion is fulfilling the norms of the six keys of Andrews. Exclusion Criteria : · Presence of caries · Posterior and anterior crossbite · Congenitally missing or supernumerary teeth · Cleft lip and palate or any other syndrome The measurements made on the study models and radiographs will be repeated after 30 days by the same observer by random selection of the sample. Dahlberg formula will determine the method error. In order to find untreated cases with enough ethnic variability, subjects from isolated populations without access to dental care will be reached. Information about their eating habits will also be recorded. This represents the novelty of our study. The second part of the study will be to relate the evolution pattern of the untreated sample with the orthodontically treated cases. Comparison between groups will be made by using the Students t-test. Pearson’s correlation coefficient will be used to determine the relationship between the pattern of changes in occlusion with the facial pattern.

Date:1 Feb 2019 →  21 Jun 2023
Keywords:Retention, Human Ideal Occlusion, Malocclusion
Disciplines:Orthodontics and dentofacial orthopaedics
Project type:PhD project