الفهرس 
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Abstract
The aim of this study was to measure the occlusal parameters of orthodontically treated cases with premolar extraction (experimental group) and compared the result with the measures of non-orthodontic normal occlusion subjects using T-Scan III system as a digital novel quantitative and accurate method for measuring the occlusal parameters.
The study included 48 participant 32 female and 16 males with age ranging from 17 to 28 years, divided into two groups; experimental group included 24 patients (16 females and 8 males) from the outpatient clinic of the orthodontic department - Faculty of Dentistry - Ain Shams University who finished their orthodontic treatment which included extraction of permanent first premolars teeth and control group which included 27 untreated participants (15 females and 9 males) had class I molar and canine relation with normal anterior and posterior overjet and overbite.
T-Scan III occlusal analysis were performed for both groups in centric occlusion, protrusion, right and left lateral excursion. Force distribution on the teeth, presence of interferences, and type of occlusion were assessed.
The results showed the presence of significant force distribution imbalances, premature contacts and balancing side interferences in experimental group when measured by the T-Scan technology, despite that their end results after orthodontic treatment appeared visually good when judged to the static goals of orthodontic treatment. These force imbalances and interferences may act as a causative factor in post-orthodontic treatment instability, periodontitis, NCCL, appearance of TMD signs and symptoms and negatively affect the masticatory function.