تقنية الطرح الرقمي للصور الشعاعية الذروية في دراسة التغيرات النوعية للعظم حول الزرعات السنية : دراسة مقارنة بين صور الطرح الرقمي الخطي و صور الطرح الرقمي اللوغارتمي

الملخص EN

Aim of the study: The aim was to evaluate the efficiency of the digital logarithmic subtraction method in assessing the alteration of bone density around the dental implants; comparison with the digital linear subtraction method.

Method: Forty dental implants were set in the posterior mandibles of 40 patients.

A standard reference periapical digital Image (A) was taken one-week post-surgical.

Three images (B1, B2 and B3) were taken 3 months later.

These images were treated separately by digital linear and logarithmic subtractions using Emago advanced/5,3 software; so, 120 linear subtraction and 120 logarithmic subtraction images were obtained.

A region of interest (ROI) was determined distal to each implant cervical area and radiographic bone density was obtained.

Results: The mean value of the total digital subtraction evaluated by logarithmic subtraction was significantly more compared to what was evaluated by linear subtraction (21.70±9.36 and 17.24±8.98 respectively; P<0.000), counter to the mean values of the total change of the digital subtraction (0.58±0.53 and 1.89±1.38 respectively; P<0.000) and the percentage of the total change of the digital subtraction (3.41±6.64 and 13.08±10.96 respectively; P<0.000) which were less.

Conclusion: The digital logarithmic subtraction is a precise method in evaluating the alteration of the bone density