Multifunctional guide for full-arch implants: what it is

What is a multifunctional guide?

A multifunctional guide is a clear acrylic device made by duplicating the patient’s complete denture, so it carries the final tooth positions planned for a full-arch implant bridge. The name comes from the jobs it combines: guiding implant position at surgery, serving as the impression tray, and recording the bite.

You’ll also see it described as a duplicate denture used as surgical template, custom tray and occlusal index. Ozkomur and Manfroi (Journal of Prosthodontics, 2018) describe it as a surgical template at placement and a framework for the definitive impression and occlusal registration. The logic is restoratively driven: tooth position comes first, and implant position follows.

What does a multifunctional guide do in a full-arch case?

A multifunctional guide serves four stages of a full-arch implant case: the CBCT scan, surgery, the implant impression and the jaw relation record. At each stage it carries the same information, the planned tooth positions, so you don’t remake preliminary impressions, record bases and wax rims along the way.

Duarte and colleagues (Revista Fluminense de Odontologia, 2022) report a mandibular full-arch case with delayed loading. After the guide impression, three appointments were left: bar try-in, wax try-in and delivery. Without the guide, the authors count preliminary and border-molded impressions and a record base with wax rim before the wax try-in.

When should you use a multifunctional guide?

A multifunctional guide makes sense for an edentulous full-arch case when the denture to be duplicated has stability, retention, acceptable esthetics, correct vertical dimension and adjusted occlusal contacts. Those are the conditions Duarte and colleagues (2022) list. Since the guide copies that denture, any error in it carries over.

If the current denture doesn’t meet those conditions, it has to be corrected or remade before duplication. The guide works with immediate and delayed loading. Ozkomur and Manfroi (2018) present it for immediate or early loading; in the Duarte case, immediate loading was ruled out, and the guide kept since surgery came back for the impression after uncovering. The loading protocol and the technique are your call.

How accurate is an impression through the multifunctional guide?

An impression through the multifunctional guide meets two conditions the literature links to better full-arch accuracy: splinted impression copings and an open tray. In the review by Papaspyridakos and colleagues (2014), on edentulous arches, splinting was more accurate in 15 studies, against 1 favoring non-splinted and 9 with no difference.

The same review found the open tray more accurate than the closed tray on edentulous arches, and no difference between polyether and vinyl polysiloxane. The review by Baig (2014), limited to edentulous arches, found conflicting evidence on splinting and made no recommendation.

For the guide itself, the evidence is in vitro. Araújo and colleagues (The International Journal of Oral & Maxillofacial Implants, 2021) tested it on a maxillary model with four angled implants. Splinting the copings to the guide with metal and resin gave lower 3D deviation than resin alone. No clinical trial has compared the guide with a conventional tray.

Multifunctional guide or scan bodies?

In a digital workflow, scanning does the multifunctional guide’s job. The denture or provisional, scanned in and out of the mouth, carries tooth position and the bite; the scan bodies carry implant position. The guide stays useful when the implants are transferred by a conventional impression, in an analog or hybrid workflow.

There is also a digital version. Negreiros, Hamilton and Gallucci (The Journal of Prosthetic Dentistry, 2022) describe a multifunctional surgical template designed from a virtual tooth arrangement. The scan sequence is in our guide on how to scan a full arch for an implant bridge, and the comparison with photogrammetry is in photogrammetry vs intraoral scanning.

What do you send the lab when the impression goes through the guide?

When the full-arch impression goes through the multifunctional guide, the lab needs the guide itself, with the impression copings and impression material in it. It also needs the opposing arch and the brand and platform of the implants and abutments. The guide already carries the bite and the tooth positions. The full list:

• the guide with the impression and the splinted copings, none of them removed;
• implant brand and platform; brand, cuff height and angle of each multi-unit abutment, by FDI tooth number;
• the opposing arch, as a stone model or an impression;
• the Vita shade for the teeth and the gingival shade;
• the type of bridge planned, and whether there will be a bar or wax try-in before the definitive;
• a signed Rx with your license number.

Before surgery, agree with the lab on who duplicates the denture, in which resin, and whether the same guide will serve at surgery and at the impression. The basics of the Rx are in our guide on how to send a case to the lab.

Smile Digital Lab, a digital dental lab in São Paulo, Brazil, makes full-arch bridges in zirconia, zirconia on a titanium bar or PMMA, immediate-load prostheses and complete dentures. We use Neodent and Titaniumfix components, both made in Brazil. The options are on our implant restorations page.