Histometric and Histological Analysis of Bone to Screw Contact Between Metallic and Absorbable 2.0 Fixation System: A Pilot Study in Dogs

ObjectiveTo evaluate the bone/screw interface of a titanium IF system and an absorbable IF system.Materials and methodsTwelve male adult dogs were subjected to osteotomy performed between the third and fourth mandibular premolars, been divided into two groups (control or experimental side). Two miniplates were applied to fix mandible fragments. Histometric values for bone-to-screw contact (BSC), bone-to-screw distance (BSD) and histological findings were evaluated at 2 and 18 weeks.ResultsDifference in BSC were detected from absorbable and metallic monocortical group on the experimental side at 2 weeks (p = 0.0041). Larger BSDs were detected at buccal bicortical absorbable experimental sides (p = 0.0041), with larger distances detected from the vestibular side to the lingual cortical side (p < 0.0001) and on the control side at 18 weeks (p = 0.0143), having metallic group significant BSD results on the experimental side at 2 weeks (p = 0.047). Connective tissue was noted on vestibular cortical side in monocortical and bicortical absorbable screw groups. ConclusionsAbsorbable bicortical screws with splint had histometric and histological behaviors similar to metallic bicortical group at lingual cortical side.Clinical RelevanceInion absorbable bicortical screws did not promote connective tissue formation at lingual cortical side.

Comparison of outcome of two plate fixation with one plate fixation along with arch bar in management of parasymphysis; A Randomized Control Trial.

Objectives: The aim of this study is to compare two plate fixation and one plate along with arch bar in the treatment of parasymphsis, and to analyze the advantages and disadvantages over one another. Study Design: Randomized Clinical Trial. Setting: Department of Oral and Maxillofacial Surgery Sardar Begam Dental College and Northwest General Hospital Peshawar. Period: Over a period of one year from June 2017 to August 2018. Material & Methods: 60 patients with parasymphysis fracture after diagnosis established on clinical and radiological examination were equally divided into two groups, 30 patients in each. Group (A) were treated with two miniplates, while Group (B) one miniplate along with arch bar under general anesthesia with proper antibiotics coverage in the pre- and post-operative period. Results: The infection rate 4 (13.3%) patients in Group B while 0 in Group A. No Loosening /fracture of screw or plate occur in any subject in group A at any follow up visit, while it occurred in 4 subjects in group B at 15 days follow up period. 9 patients in Group A and 6 in Group B presented with immediate post of paresthesia, which was reduced to 7 patients in group A and 6 in group B at 15 days follow up, and to 4 patients in Group A and 5 in Group B at 1 month follow up. Similarly, no subject had inferior border misalignment in group A at any follow up period while 3 subjects have immediate post -op inferior border discrepancy in group B and 6 subjects in the same group shows inferior border discrepancy at 15 days , but the overall result of this variable was also statistically non-significant. Conclusion: Isolated mandibular parasymphysis fracture can be treated with either two miniplates or one miniplate along with arch bar for 6 weeks. Both treatment protocol shows advantages and disadvantages with the aim of achieving the best treatment outcome for the patients.