Study examines influence of angle between drill and bone on template-guided placement
jeudi 17 octobre 2019
Posted by: Paola Pino
A recent study investigated the influence of drilling protocol, as well as the angle between drill and bone, on the precision of template-guided implant placement in an artificial bone and soft tissue model of a human maxilla.
Predictable results and low positional deviation may be achieved when dental implants are placed via stereolithographic templates in the healed alveolar ridge. However, when guided implant placement into fresh extraction sockets is attempted, drilling precision may be compromised due to the steep angle between the drill and the alveolar wall. This study examined the predictability of results and amount of positional deviation across four angles, using Wilcoxon tests and multivariate analysis.
Four different angles between drill and bone surface were investigated using 69 drills each – 10°, 20°, 30° (representing immediate implant placement) and 90° (representing late implant placement). While no difference in angular deviation of late implants (2.5°) was observed between both drilling protocols, a significantly higher deviation of immediate implants was seen at 10°–30° angle.
The study concluded that a significant 2.2-fold increase of angular deviation must be expected when immediate implants are placed, because of this steep angle. When guided implant placement into fresh extraction sockets is attempted, drilling precision may be compromised. Therefore, the authors note that the use of precision drills may help to significantly reduce positional inaccuracy.
This study was presented as an e-poster at the 2018 EAO Congress.