Fixed Full Arches Supported by Tapered Implants with Knife-Edge Thread Design and Nanostructured, Calcium-Incorporated Surface: A Short-Term Prospective Clinical Study

Abstract

Purpose. To evaluate implant survival, peri-implant bone loss, and complications affecting fixed full-arch (FFA) restorations supported by implants with a knife-edge thread design and nanostructured, calcium-incorporated surface. Methods. Between January 2013 and December 2015, all patients referred for implant-supported FFA restorations were considered for enrollment in this study. All patients received implants with a knife-edge thread design and nanostructured calcium-incorporated surface (Anyridge®, Megagen, South Korea) were restored with FFA restorations and enrolled in a recall program. The final outcomes were implant survival, peri-implant bone loss, biologic/prosthetic complications, and “complication-free” survival of restorations. Results. Twenty-four patients were selected. Overall, 215 implants were inserted (130 maxilla, 85 mandible), 144 in extraction sockets and 71 in healed ridges. Thirty-six FFAs were delivered (21 maxilla, 15 mandible): 27 were immediately loaded and 9 were conventionally loaded. The follow-up ranged from 1 to 3 years. Two fixtures failed, yielding an implant survival rate of 95.9% (patient-based). A few complications were registered, for a “complication-free” survival of restorations of 88.9%. Conclusions. FFA restorations supported by implants with a knife-edge thread design and nanostructured, calcium-incorporated surface are successful in the short term, with high survival and low complication rates; long-term studies are needed to confirm these outcomes.

The Effect of Deep Threads on the Stability of Dental Implants in Posterior Maxilla

“…In accordance with Bechara et al (33) in 2017, peculiar macrotopography, characterized by knife-edge threads was capable of maximizing the primary implant stabilization in difficult situations as in the case of low-bone-quality sites.…”

“…This value is known as the primary stability, which indicated a high primary stability. The high primary stability may be contributed to the knife edge threads of implant (32,33).…”

Scanning Electron Microscope (SEM) Evaluation of the Interface between a Nanostructured Calcium-Incorporated Dental Implant Surface and the Human Bone

“…Although several clinical studies have shown that dental implants with a nanostructured surface enriched with calcium ions through the hydrothermal method (Xpeed ® ) can have high survival and success rates, at least in the short term [10,36,37,38,39], still little is known about the mechanism of healing these fixtures in vivo [32,33]. …”

Complications of Fixed Full-Arch Implant-Supported Metal-Ceramic Prostheses

“…However, very few clinical studies have been carried out to evaluate the implant survival rate and mechanical-technical and biological complications of restorations of this kind compared to the large number of studies on resin veneered prostheses. Thus, for fixed full-arch metal-porcelain prostheses, implant survival rates of between 95.0% and 98.7% [6,[20][21][22], have been reported for one arch or the other and for different numbers of years of loading. As in full-arch screw-retained metal-acrylic/resin prostheses, mechanical-technical complications of full-arch metal-porcelain restorations are very frequent in a range of 33.3 to 36% at ten years [6,20], although after three years of loading, 88.9% of complication-free restorations have been reported [21] Regarding biological complications, a recent study that combined full-arch metal-ceramic and metal-resin prostheses reported 73.3% of prostheses and 90% of implants as being periimplantitis-free [22].…”