External Dental Implant Catalog - BioHorizons

Crestal bone maintenance leads to success
Biomechanical thread form | Backed by science
External implants feature the time-proven, biomechanical square thread which has been demonstrated to provide
increased bone-to-implant contact and yield higher reverse-torque values.
Reverse Torque Value (Ncm)
% Bone-to-Implant Contact
Steigenga J, Al-Shammari K, Misch C, Nociti F and Wang H-L. Effects of Implant Thread Geometry on Percentage of Osseointegration and Resistance to Reverse
Torque in the Tibia of Rabbits. J Periodontology 2004;75:1233-1241
BioHorizons Implants
A prospective, multicenter trial showed a 5-year cumulative success rate of 99.5% for 495 External
implants in 151 patients. There were no significant differences in the results by center, implant type, bone
density, area of the mouth or prosthesis type. Crestal bone loss from prosthesis delivery to one-year
follow-up was extremely low (0.06mm), and actually turned into bone gain at later follow-up intervals. 5
Radiographs of External implants in function for more than
6 years. Note that the crestal bone levels are maintained
above the level of the first thread. Courtesy of Dr. Carl E. Misch.
Increased surface area for immediate loading success
Bone is strongest in compressive loading; weakest in shear. External’s square-thread design imparts 10 times less destructive stresses
at the implant / bone interface than conventional v-thread designs, while maximizing compressive load transfer and providing
excellent primary stability. These attributes have become increasingly important with the emergence of early and immediate load
protocols. 6,7,8
The square-thread design provides up to 154% greater surface area than conventional v-thread designs. A comparative study of
thread designs (square-thread, v-thread and buttress thread) concluded that the square-thread design exhibited significantly higher
reverse torque values and bone-to-implant contact than the other thread designs. 3
BioHorizons
square-thread
V-thread Modified-square
15.58 ± 6.07
65.46 ± 9.64
N Implants N Failures % Implant Survival % Prostheses Survival
Immediate Functional Loading
126 0 100% 100%
Immediate Non-Functional Loading 116 0 100% 100%
Degidi and Piattelli. Immediate Functional and Non-Functional Loading of Dental Implants: A 2- to 60-Month Follow-Up Study of 646 Titanium Implants.
J Periodontology 2003;74:225-241.
3
Conventional
v-thread
23.17 ± 9.68
74.37 ± 8.63
Multiple studies have demonstrated the BioHorizons square thread to be extremely reliable in immediate loading protocols.
One study, summarized below, followed 242 BioHorizons implants through immediate functional and non-functional loading.