BACKGROUND All clinicians are aware of the difficulty of installing a dental implant in posterior maxilla because of proximate position of maxillary sinus, insufficient bone width, and lower bone density. This study is to examine which factors will make the implantation in the posterior maxilla more difficult, and which factors will affect the postoperative implant stability in this region. M...

The potential performance of implant free heterostructure In0 3Ga0 7As channel MOSFETs with gate lengths of 30, 20, and 15 nm is investigated using state-of-the-art Monte Carlo (MC) device simulations. The simulations are carefully calibrated against the electron mobility and sheet density measured on fabricated III-V MOSFET structures with a highdielectric. The MC simulations show that the 30 ...

objective: to assess the stability changes as a reflection of early healing around roughened- surface implants in human by resonance frequency analysis (rfa). materials and methods: one hundred and fifty one iti sla implants were placed in either maxilla or mandible of 68 patients. bone type was classified into 4 groups according to lekholm and zarb index. rfa was used for direct implant stabil...

Between 1990 and 1995, 214 implants were placed in 29 maxillae and mandibles of 22 patients following extraction of all residual teeth as a consequence of severe periodontal disease. All patients were discharged wearing immediate dentures. The implants were analyzed with regard to the number per arch, location, length, and diameter. The 5-year cumulative survival rate was 98.5%. The mean number...

Implant stability plays a critical role for successful osseointegration, which has been viewed as a direct structural and functional connection existing between bone and the surface of a load-carrying implant(Bränemark, et al. 1977, Sennerby & Roos 1998). Achievement and maintenance of implant stability are prerequisites for successful clinical outcome(Sennerby & Meredith 2008). Therefore, meas...

Statement of the Problem Despite the low failure rate of dental implants, recognition of the risk factors can enhance the predictability of failure. Purpose The aim of this study was to evaluate the risk factors for early implant failure. Materials and Method This retrospective cohort study was conducted on two groups of patients, the patients with a failed implant before loading and those ...

The long term success of dental implant treatment relies on the proper stability of the implant within the host bone. This condition is achieved through osseointegration, which is characterized as a direct functional and structural connection between ingrown bone tissue and implant surface (Brånemark et al., 1977; Simmons et al., 2001). Osseointegration begins with rapid growth of random and un...

In histomorphometrical investigations of bone tissue modeling around screw-shaped implants, the manual measurements of bone area and bone-implant contact length around the implant are time consuming and subjective. In this paper we propose an automatic image analysis method for such measurements. We evaluate different discriminant analysis methods and compare the automatic method with the manua...

Background and objectives. The use of short implants is nowadays frequent in daily practice. The objective of this experimental study was to test the correlation between extremely different implant surfaces and the anchorage of short implants. Materials and Methods. The anchorage of machined-surface and titanium-plasma sprayed (TPS) implants of various lengths was investigated in the dog maxill...

BACKGROUND Many clinical observations have shown that immediate loading is indicated when the stabilization of the bone/implant is optimal and when the estimated loads are not excessively high. Nonetheless, more experimental studies are needed to consider the immediate loading protocol as a safe procedure. Mechanical analysis using the finite element (FE) method analysis has been employed by ma...