Cemented versus implant‑retained prostheses: one‑year RCT and what it means for your chair

A small 1‑year randomized trial found similar implant stability and peri‑implant indices for digitally made 3D‑printed overdentures and cement‑retained milled fixed prostheses — choose retention by maintenance needs, retrievability and your cement protocol, not by fear of early bone loss alone.

This week’s radar includes a randomized, single‑year clinical trial (18 patients) that compared digitally fabricated mandibular prostheses: a 3D‑printed implant‑retained/‑supported overdenture group and a cement‑retained milled fixed prosthesis group (J Prosthet Dent 2026). The authors measured implant stability and routine peri‑implant clinical indices over 12 months after guided, flapless placement and reported no significant difference between groups for implant stability, probing depth, plaque, or bleeding scores; implant stability increased over time in both groups. (J Prosthet Dent 2026).

Why this matters to the busy clinic: many colleagues worry that cemented fixed prostheses automatically cause more early biological trouble than removable options. This small randomized trial shows that, at least over the first year with modern digital workflows and careful surgical technique, cement‑retained fixed milled prostheses did not produce worse peri‑implant indices or lower stability than 3D‑printed overdentures. It does not prove “no difference forever” — 18 patients is underpowered for uncommon events and one year is short for late cement‑related complications — but it supports a pragmatic view: retention mode is only one of several modifiable risks. (J Prosthet Dent 2026; see also longer RCTs of single crowns showing mixed results over 5+ years).

How to translate this into Monday‑morning choices: first, decide retention on maintenance and retrievability. If you offer a cemented fixed solution, plan for retrievability (screw access holes through the framework, removable cement techniques, or provisional cements combined with a controlled cementation protocol) so you can inspect and remove the prosthesis without damaging it. Second, control cement volume: recent prosthodontic work shows thin‑film/extracorporeal or controlled, vented copings reduce excess cement and make biologic complications less likely than bulk intraoral cementation. Adopt one reproducible cementation routine rather than ad hoc bulk filling. (J Prosthet Dent 2025).

A few practical checks for every cemented full‑arch or multi‑unit case: design screw‑access channels when possible; use an abutment replica to extraorally seat and remove excess cement before final insertion; limit finish lines to where you can view and probe easily; choose cements you can remove predictably (and document your plan in the chart). If the patient’s ability to attend maintenance visits is limited, favour designs that are retrievable without laboratory work. These are simple clinic investments that reduce the long‑term risk of peri‑implant problems that may take years to appear. (Clinical Oral Implants Research RCTs, 5‑ to 7.5‑year studies provide longer‑term context).

Limitations and a realistic summary: the new trial is small (n=18) and reports only one‑year outcomes after a digital, guided protocol. It reassures us that with careful technique and a cement control strategy, early implant stability and soft‑tissue indices are similar between these prosthesis types. It does not replace longer follow‑up or larger studies for rare but important outcomes such as late peri‑implantitis from residual cement, framework fracture, or prosthetic loosening. Use retention as a tool: pick the retention that gives safe function, easy maintenance and predictable repair in your practice.