Ti-base vs custom abutment: what changes on the Rx

How is a Ti-base different from a custom abutment?

A Ti-base (titanium base) is a prefabricated component: the implant connection at the bottom and a short post on top that the ceramic is bonded to. A custom abutment is designed in CAD for that one implant, with the emergence profile and margin set for the site, and milled either in titanium or as zirconia bonded to a Ti-base.

What matters on the Rx is how many pieces go into the mouth and where the cement sits. The 2013 ITI consensus describes both ways of building a screw-retained restoration: the abutment can be separate from the crown (two-piece) or joined to it during fabrication (one-piece). A Ti-base crown, often called a hybrid abutment crown, is the one-piece option; a custom abutment with a cemented crown is the two-piece one.

Clinical follow-up is still short. Mean follow-up in the Chantler review was 31 months, and the longest dataset, Graf’s, is retrospective. Which of the four fits the case is your call.

Does a Ti-base crown last as long as a cemented crown?

On the data available, a screw-retained Ti-base crown survives as well as the alternatives, at least in the short and medium term. In the systematic review by Chantler and colleagues (Clinical Oral Implants Research, 2023), 857 single-unit prostheses on Ti-bases had 98.6% survival at one year. A meta-analysis of six randomized trials in the same review found no difference in survival from other abutment types.

Zhang and colleagues (Journal of Prosthodontic Research, 2024) looked only at one-piece hybrid abutment crowns. Across 20 studies, one-year survival was 100%, with no difference from cemented crowns where the two were compared head to head, and the estimated incidence of complications stayed under 1%.

The longest follow-up comes from a retrospective study. Graf and colleagues (Clinical Oral Implants Research, 2024) followed 601 posterior screw-retained crowns on Ti-bases for 3 to 12.9 years. Estimated 10-year survival was 93.5% for monolithic lithium disilicate and 95.9% for veneered zirconia, which had more complications. Taller crowns had lower survival.

Does a Ti-base affect bone and soft tissue around the implant?

A Ti-base made very little difference to bone, and a custom abutment made no measurable difference to soft tissue, in the trials that looked. Liu, Chiam and Wang (International Journal of Oral & Maxillofacial Implants, 2024) pooled six randomized trials with 274 implants. Ti-base restorations showed 0.088 mm more marginal bone loss than one-piece abutments, with no difference in probing depth, bleeding on probing or prosthetic complications. The authors call the evidence insufficient.

On soft tissue, Lops and colleagues (Journal of Clinical Medicine, 2023) compared CAD/CAM and prefabricated abutments in the esthetic zone across six studies and 230 implants. At 12 months, midfacial recession, papilla fill and pink esthetic score did not differ. So the reason to go custom is the geometry of the site: where the margin has to sit, where the access hole comes out and how much contour the tissue needs.

When does a custom abutment make more sense than a Ti-base?

A custom abutment with a cemented crown makes sense when the screw access would come out through a visible surface or the margin has to sit at a height the Ti-base can’t reach. It also fits when you want an intact occlusal surface. Those are the situations in which the 2013 ITI consensus recommends cement retention, with margins at or above the tissue and with real care at cementation.

For an implant angled toward the facial there is a third route: an angled screw channel, which keeps the crown screw-retained. The meta-analysis by Atieh and colleagues (Journal of Esthetic and Restorative Dentistry, 2025) pooled four studies and 167 non-molar crowns. Outcomes were comparable to cemented crowns, with less bleeding on probing. Follow-up is still short, and the option depends on the implant system offering the component.

Residual cement and margin depth are covered, with the numbers, in screw- vs cement-retained implant crowns.

Does Ti-base height matter?

Ti-base height matters for the crown bonded to it. Ntovas and colleagues (Clinical Oral Implants Research, 2024) reviewed the lab studies on cementing CAD/CAM restorations to Ti-bases, and base height was the factor that weighed most on retention. Air abrasion helped on bases at least 3.5 mm tall without micro-retentive features, and the authors call for a validated bonding protocol.

Ti-bases come in different cuff and post heights depending on the system. If the mucosa is thick or the space to the opposing arch is short, say so on the Rx. Those two measurements drive the choice of base and the base-to-crown proportion, and in Graf’s study taller crowns did worse.

What should go on the lab Rx?

The Rx needs to say which design you want and give us what the scan can’t show. Include:

• screw-retained crown on a Ti-base, custom abutment with a cemented crown, or stock abutment with a cemented crown;
• implant brand, system and platform, plus the make and model of the scan body you used;
• the cuff height you want, or the tissue thickness if you measured it;
• for a cemented crown, where you want the margin relative to the mucosa;
• if the access comes out on the facial, what to do: cement on an abutment, or use an angled channel if the system has one.

At Smile Digital Lab, our implant components are Neodent and Titaniumfix, both made in Brazil. At check-in we confirm the component for your case is in stock before it moves on, and if you place a different system, that conversation happens before you send. Our zirconia implant crown page shows how the crown is made. Why implant crowns get remade explains what a wrong platform on the Rx costs, and the intraoral scanning guide shows how to capture the scan body.