Titanium bases.
A titanium base engages the implant connection while a ceramic superstructure is bonded over it. The metal handles the interface where precision and resilience matter; the ceramic handles emergence and aesthetics.
Why the metal interface matters
A one-piece ceramic abutment engaging the implant connection directly puts a hard, unyielding surface against titanium. Over time and under cyclic load, that can wear the implant's internal geometry — and an implant with a worn connection is a considerably larger problem than a worn restoration.
A titanium base places titanium against titanium at the connection, which is what the connection was designed for, and keeps the ceramic where its properties are useful.
It also means the retaining screw seats against metal rather than ceramic, which is more forgiving of the torque involved.
The bonded interface has requirements
The superstructure is bonded to the base, and that bond has to hold for the life of the restoration. It needs adequate height on the titanium base — typically a stated minimum from the manufacturer — appropriate surface treatment on both components, and a resin cement suited to bonding ceramic to metal.
Where interocclusal space is very limited, the height available for that bond becomes the constraint. A base shortened to fit the space has less bonded surface, and debonding of the superstructure is the resulting failure mode.
Check space early. It is the recurring reason a titanium base approach turns out not to be viable.
Aesthetics with thin tissue
Where the tissue is thin, a full titanium abutment can show through as a grey shadow at the margin. A zirconia superstructure over a titanium base moves the metal apically, away from where it would be visible.
The base still sits at the connection, so the metal is not eliminated — it is positioned where the tissue is thicker and it does not read through.
For an anterior implant in a thin biotype with a high lip line, that is frequently the difference between an acceptable result and a visible one.
Engaging or non-engaging
Bases come in engaging and non-engaging forms. An engaging base indexes into the implant's internal geometry, resisting rotation — appropriate for a single unit where rotational stability matters.
A non-engaging base does not index, which is what allows multiple units to be splinted and seated along a common path despite differing implant orientations.
Specify which the case needs. Using an engaging base on a splinted multi-unit prosthesis produces something that will not seat.
Retrievability
A restoration on a titanium base is screw-retained through the base, which means the whole assembly can be removed and replaced without destroying it.
That is a real advantage over a cemented crown on a definitive abutment, particularly for maintenance, for managing peri-implant problems, and for repair.
It also means the screw access channel passes through the ceramic superstructure, so the channel position has to be acceptable — which comes back to implant angulation.
Failure modes to know about
The characteristic failure is debonding of the ceramic superstructure from the base, and it points at the bonded interface rather than the implant: insufficient base height, inadequate surface treatment, contamination, or an unsuitable cement.
Where a superstructure debonds, it can usually be rebonded — but the cause should be identified first. A restoration that debonds twice is reporting inadequate bonded surface area or an occlusal load the design cannot carry.
Screw loosening is the other recurring issue and points elsewhere: preload, off-axis loading, or a component that never seated fully.
What to send
System, product line, platform and connection, so the correct base is selected. Whether the case is single-unit or splinted, so engaging or non-engaging can be chosen. The interocclusal space available. The superstructure material you want.
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Digital scans and conventional impressions are both accepted. Cases move by UPS and Purolator, and Fairmont works with practices throughout British Columbia and across Canada.