الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 141 |  |  |
| | | from | 141 | | |
Abstract
Objective The objective of this study was to evaluate the influence of two different occlusal scheme on the clinical outcome of immediately function loaded dental implant. While the objective of the invitro study was to evaluate the influence of cyclic loading fatigue at two different angles on retentive strength of cast metal crowns cemented to dental implants.
Patients and methods. For clinical study, 14 patients were selected for replacement of missing mandibular first molar with 14 one piece titanium implant according to the immediate function protocol. Definitive restorations (metal ceramic crowns) were cemented to the implant. Patients were equally divided into two groups according to their occlusal scheme. Group I: group function occlusion and Group II: canine protected occlusion. After implant placement, patients were evaluated clinically and radiographically immediately, at 6 weeks, 3 and 12 months. For in vitro study, 14 implants restored with full metal crowns were divided into 2 groups I and II (n=7) according to direction of load application during cyclic loading fatigue. To mimic intraoral conditions, the specimens in each group were fatigued in a computerized masticatory simulator under wet conditions for 1000 masticatory cycles using a load of 49 N. Group I specimens were cyclic loaded along the long axis of the implant where the ball end applied the load at midline fissure of the crown. Group II specimens were cyclic loaded at 45 degree to the long axis of the implant where the ball end applied the load at the lingual inclines of the buccal cusps. The crowns were dislodged from their respective implants using a universal testing machine. Tensile load was applied at 0.5 mm/min crosshead speed until separation occurred. Retentive strength in (N) was recorded for each specimen.
Results. All evaluated clinical and radiographic parameters revealed no significant difference between the two groups (P > 0.05). Also there was no statistically significant difference between median retentive strength of group I and II (870.5±45 /843.2±38 N, p= 0.65).
Conclusion. Within the limitation of this study, it could be concluded that, scheme of occlusion did not significantly affect clinical outcome of one piece titanium implants replaced missing mandibular first molars with immediate occlusal loading protocol. Also, cyclic loading fatigue at two different angles had no significant effect on retentive strength of cast metal crown cemented to one piece implant