Abstract
This study aimed to evaluate the validity of using of digital dental X-ray for the thumb region in assessment of skeletal maturation stage around functional orthodontic treatment time. The sample consisted of 200 patients (100 males and 100 females) aged between (9.5-18) years. Each patient underwent a hand-wrist radiograph and a digital radiograph for the thumb region taken by a dental X-ray machine. Skeletal changes were studied in the sesamoid bone and first Metacarpophalangeal joint region, and compared to Björk method. Good correlation was noted between our thumb method stages (Th index) and hand-wrist maturation stages, so Th index has a good validity and reliability in assessment of maturation stages, in addition to its simplicity, accuracy and advantages in saving time, cost and decreasing radiographic exposure compared with hand-wrist maturation stages.
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