The On 1 concept is basically a healing abutment that has been sliced horizontally into two separate pieces that attach together. The On 1 base makes up approximately two-thirds of the total height and the cover makes up the remaining one-third. There are two options available: one to work with short aesthetic outcomes and another for long aesthetic outcomes.
The On 1 base is never removed after its initial placement. Only the On 1 cover is removed for placement of an impression coping or for delivery of the temporary crown or final implant crown. Since the cover remains at or very slightly below the tissue level, the problems associated with removing a healing abutment, again and again, does not exist. The tissue remodels around the On 1 base one time, allowing the tissue to remain undisturbed for optimal healing.
If you would prefer to use a totally digital workflow, the On 1 concept offers an IOS cap that serves as digital intraoral scanning abutment. Using this abutment allows for an impression-free restoration to be fabricated by the dental laboratory.
On 1 is a new system. It was introduced to the dental marketplace in 2016. So, are there any independent studies that outline how it behaves clinically? I found one clinical trial that was completed in May 2019 that involved 72 participants. The trial looked at marginal bone loss around the implants and patient satisfaction with function and aesthetics among other factors. After one year, all is well according to the study. But there hasn’t been time to really test to see if Nobel BioCare’s theory actually makes a difference in clinical practice.