How do I choose between a screw-retained and cement-retained Implant Crown and Bridge, and when is a custom milled abutment better than a ti-base?
Selecting between the two retention designs, and between a stock and a custom abutment, is one of the first decisions in an implant restorative plan. The choice is driven by implant angulation, access hole position, esthetic demands, retrievability needs, and the number of units involved.
When a screw-retained design fits Screw retention is attractive when retrievability matters and when the implant angulation allows the access channel to emerge in an acceptable location. Because there is no cement at the margin, screw retention also sidesteps the subgingival cement cleanup problem entirely. The practitioner must, however, plan for access hole positioning and the manufacturer torque specification, and accept that the access channel will be visible until it is sealed with composite.
When a cement-retained design fits Cement retention offers more flexibility with implant angulation and delivers a seamless, access-hole-free esthetic result with optimal emergence contours. The trade-off is that excess cement must be removed completely, which is challenging when margins sit sub gingivally.
The table below summarizes the practical contrasts drawn from ROE's implant crown workflow guidance.
| Decision factor | Screw-retained | Cement-retained |
|---|---|---|
| Retrievability | Straightforward (unscrew) | Limited once cemented |
| Implant angulation tolerance | Requires acceptable access hole position | More flexible |
| Esthetics | Access hole present, then sealed | No visible access hole |
| Primary cleanup risk | Cracks or chips at access hole | Excess subgingival cement |
| Final securing step | Torque screw to manufacturer value | Torque abutment, then cement crown |
Single versus multiple units Unit count also influences the impression approach and the framework strategy. Open-tray impressions are the most recommended method for anything more than one implant, and multi-unit cases such as all-on-four or cases with four, five, or six implants are especially sensitive to positional accuracy, because a single incorrectly positioned implant at impression time can cause the entire restoration to fail and require remaking. Those impression considerations are covered in the records and impressions article.
Stock ti-base versus custom milled abutment A stock ti-base is appropriate for many routine single implant crowns where the implant is well positioned. A custom milled abutment becomes the better choice when the implant was not placed in an ideal position and angulation must be corrected, and for anterior cases where the emergence profile needs to be developed more precisely. Because ROE mills abutments in-house, the custom option does not impose a timing disadvantage for most implant systems.
Clinical rule of thumb: if the implant angle or the anterior emergence profile is working against you, a custom milled abutment usually solves the problem that a stock ti-base cannot.
If you are unsure which path suits a given case, ROE assigns each account a dedicated technical support team that can advise on case planning (see the ordering article for contact details, or visit https://www.roedentallab.com/tss).
Additional Resources
For more information concerning Implant Crown and Bridge:
- Implant Crown and bridge product page
- Video: Ti Base vs Custom Milled Abutments - The Best Fit for Doctors
Contact Information
For help with a Locator Fixed solution for your next case, contact ROE Dental Laboratory:
- Phone: (216) 663-2233
- Email: info@roedentallab.com