website: AADR 37th Annual Meeting

ABSTRACT: 1265  

Numeric Code Identifies Tooth Pattern, Jaw Symmetry in Ectodermal Dysplasia

C. ASMUSSEN1, A. VAN WIJK2, C. STANFORD1, F. FARRINGTON3, and M. FETE4, 1University of Iowa, Iowa City, USA, 2Academic Centre for Dentistry Amsterdam, Netherlands, 3University of Virgina, Richmond, VA, USA, 4National Foundation for Ectodermal Dysplasias, Mascoutah, IL, USA

Missing teeth found in various genetic forms of Ectodermal Dysplasias (ED) is well know but is there a pattern to this agenesis? Objective: During three annual conferences of the National Foundation for Ectodermal Dysplasias (NFED) a visual observation of dental condition and presence of teeth are recorded of the ED subjects. This record of missing teeth could show a pattern/genetic relationship. Methods: Data was collected during three annual conferences, 2005-2007, by calibrated dental pattern specialists. Subjects, self report dental condition and type of ED if known. Attending dentists chart observed teeth. Results: 88 subjects, ages 2 - 48 were seen demonstrating various types of dysplasia. Using a numeric code published by Arjen J. van Wijk a Tooth Agenesis Code (TAC) value is given to each quadrant per subject charted. TAC values assign a single number that represents a pattern of missing teeth. TAC value = 0, there are no missing teeth, TAC value = 255 all teeth are missing. Using the provided web-based script and entering subject's missing teeth, TAC values demonstrate the dominate pattern of each quadrant per three age groups. Group A, ages 2-5.9, Group B, ages 6-12 and Group C, ages 12-48. Group B's dominate pattern for q1-q2 is TAC value 250, 20.0%, 13.3% respectively. Dominate pattern for q3-q4 is TAC value 255, 30.0%, 33.3% respectively. TAC value 250 equates to teeth #6, 8, 9, 11 are present but percentages show no symmetry. TAC value 255 equates to all teeth missing in the mandible, q3=30.0%, q4=33.3%. Symmetry of the whole group can also be demonstrate, example Group B n=29, mandible 80%, maxillary 66.7%, right 30.0 %, left 23.3%. Conclusion: TAC values allow data analysis, in demonstrating single value for any given quadrant for data examination of pattern and symmetry. Supported by the National Foundation for Ectodermal Dysplasias.

Back to Top