Babur Ashraf Quraishi, Sheeraz Hussain, Faiza Ansari, Fareeha Zeeshan.
Frequency of Bolton Tooth Size Discrepancies Outside 2 Standard Deviation of the Bolton’s Mean Among Orthodontic Patients.
J Pak Dent Assoc Jan ;20(4):250-3.

OBJECTIVE To evaluate, the mesiodistal dimensions of permanent teeth, frequency of Bolton ratio & the presence of Bolton discrepancy outside 2 SD of the Bolton’s mean in an orthodontic population, irrespective of the type ofmalocclusion. METHODOLOGY The study was carried out at the department of orthodontics Fatima Jinnah Dental College & Hospital, Karachi. The sample comprised of 150 pairs of good quality pre- treatment study models with fully erupted & complete permanent dentition from first molar to first molar, which were selected from the orthodontic patient pool. Dental casts having grossly carious teeth, prosthesis or anomalies of teeth were not included. The mean, range and standard deviation were calculated for the mesiodistal dimensions of the teeth, anterior ratio and overall ratio.A2- sample t- testwas used to test for the statistical difference betweenmeans. RESULTS In general there was no difference between themesiodistal dimensions of themales and females so the subgroupswere combined for further calculations.Mean overall ratiowas found to be 91.54%(SD2) and the value ranged from 86.42%to 96.70%.Mean anterior ratio was found to be 78.85%(SD 2.3) and the values ranged from 72.49%to 83.14%. This study found that 13 subjects (9.1%) had overall ratio& 22 subjects (14.7%) had anterior ratio outside 2 SDofBolton’smean. CONCLUSIONS With such a high number of significant discrepancies, it is important to routinely perform Bolton tooth size analysis before starting orthodontic treatment asTSDis prevalent among orthodontic patients.

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