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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/19188

Title: Crestal Bone Level Alterations and Osseointegration After Implant Placement With or Without Surgical Flap Reflection. A Study in Beagle Dogs
Nadir Babay
Keywords: Dentistry
Master's Thesis
Issue Date: 22-May-2012
Abstract: Aim: This study aimed to evaluate the changes in crestal bone level following implant placement with the flapped and two flapless techniques and to study the effect of the flapless surgery on osseointegration in beagle dogs. Materials and methods: Ten beagle dogs, 1-2 years of age, each with an average weight of 8 to 15 kg and with full dentition, were included in the study. Bilateral mandibular second and third premolars were extracted. A three-month healing period followed. Thirty Straumann® Dental Implant System, SLActive® surface: 8 mm long, 3.3 mm diameter, standard plus, narrow neck implants were placed in the mandible. Each animal received three dental implants randomly assigned to one side of the mandible. One side received two fixtures while the other side received one. The dental implants were placed using one of the following three surgical approaches: the flapped surgical approach (Group 1), the tissue punch flapless surgical approach (Group 2) and the direct flapless surgical approach (Group 3). Three months following the fixtures placement, the dogs were sacrificed with an overdose of ketamine 10%, 8-10 mg/kg intramuscularly (IM) and 1-3 mg/kg IM xylazine 2%. Histomorphometric analysis was used to measure the changes in the crestal bone level while histological analysis measured the bone implant contact (BIC). Finally, microcomputerized tomography was used to quantify the bone volume around the implants in the three treatment groups. Results: Three months following implant placement, three dental implants from the flapless surgical approach Group 2 were clinically mobile and one implant from the direct flapless approach group 3 was lost. The bone volume percentage was 55.1% for Group 1, 51.4% for Group 2 and 53.6% for Group 3 with no statistically significant differences between the groups (p = 0.4475). The first bone contact values were 3420±762.5 μm in Group 1, 5357±1771.9 μm in Group 2 and 3842±459.5 μm in Group 3. Statistical testing of the first bone contact measurements indicated that the bone made its first contact with the implant surface at a significantly lower level when implanted with the procedure in Group 2 when compared with the other two groups (p = 0.0023); there was no significant difference between Groups 1 and 3. Bone-Implant contact was 70.1±12.6 in Group 1, 48.0±23.7 in Group 2 and 72.8±13.1 in Group 3. Statistical testing of the first bone contact measurements indicated that the implants in Groups 1 and 3 revealed a significantly higher amount of bone-implant contact compared with the implants in Group 2 (p = 0.0074), while no difference was present between Groups 1 and 3. Conclusions: There were no statistically significant differences in the bone volume surrounding the dental implants in the three groups. There were no statistically significant differences between Groups 1 and 3 regarding the BIC and crestal bone resorption. The tissue punch flapless surgical technique had significantly less BIC and more crestal bone resorption than the other two groups.
Description: Master's Thesis for Department of Periodontics and Community Dentistry
URI: http://hdl.handle.net/123456789/19188
Appears in Collections:College of Dentistry

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