الفهرس 
Factors affecting root resorption:
Evaluation of root resorption:Only 14 pages are availabe for public view
 |  | from | 133 |  |  |
| | | from | 133 | | |
Abstract
Bite raising is commonly used in orthodontic treatment and solve some
of dental problems. The depressive occlusal force that fallen on the teeth
covered by bite raising cannot be controlled by orthodontists, and the bite
raising may create premature contact, distort the periodontal ligament and
integrity of the root with the resultant root resorption. The aim of the current
study was to evaluate the integrity of root surfaces, qualitatively and
quantitatively, after bite raising.
Eighty maxillary and mandibular first premolars of 20 patients (11
females, 9 males) comprised the sample for this study. All patients were
randomly divided into two groups according to the duration of bite raising.
Each group was divided further to equally 2 subgroups comprising a control
(n= 20) and an experimental (n= 20) subgroups. The right side of each
patient was selected as the control while the contralateral side (left side) was
the experimental. The light cure composite resin (3 mm in height) was
bonded into the occlusal surface of the mandibular first premolar so that it
was in contact with the maxillary first premolar. By the end of the
experimental period (one month for group I and 2 months for group II) the
first premolars were extracted. Half of the samples were prepared for
scanning electron microscopic examination and the other were prepared for
light microscopic examination.
Scanning electron microscope was used to evaluate the root resorption
qualitatively. However, the light microscope was used to evaluate root
resorption qualitatively as well as quantitatively after imaging and measuring
the surface area of resorbed lesion using IMAGE J software program under
the same magnification (x100) and also to evaluate the repair process.