Surgical Guide for Implant Placement

A surgical guide designed in our lab from CBCT merged with intraoral scans and 3D printed, with metal sleeves that guide the drill to the planned position, angle and depth. Usually 3–5 working days after you approve the plan.

When a surgical guide is worth it

A guide adds the most value when the implant position is constrained by anatomy or by the restoration: narrow bone near the inferior alveolar canal or the sinus, anterior esthetic sites where the implant axis must match the future crown, several implants that must be parallel for a bridge or All-on-X, and flapless surgery. For a single posterior implant in wide bone, a guide is optional.

Three guide types by support

• Tooth-supported: one or a few missing teeth with stable teeth on both sides. Easy to check for fit.
• Mucosa-supported: fully edentulous, flapless. Less invasive; the mucosa is resilient, so the guide needs anchor pins.
• Bone-supported: fully edentulous with a flap and irregular bone. Stable on bone but requires wide reflection.

What to send us

• A CBCT in DICOM format, taken with the mouth slightly open or with cotton rolls to separate the arches. For edentulous cases: a dual-scan of the existing denture, or a scan of the denture with radiopaque markers.
• Intraoral scans (STL/PLY) of the surgical arch and the opposing arch, with the bite.
• Tooth positions, implant system and the manufacturer’s guided surgery kit, planned implant diameter and length, and the preferred support type.
• The plan: either your own planning file, or ask us to propose a plan for your approval.

Our process

1. CBCT and scans are merged on common tooth landmarks (radiopaque markers on the denture for edentulous cases).
2. A virtual wax-up of the future crown or bridge, so the implants are placed prosthetically driven.
3. Implant planning: axis, depth, distance to the nerve canal, sinus and adjacent roots. You receive slice-by-slice screenshots and an approval link.
4. Guide design: sleeves matching the drill system, inspection windows for fit, irrigation openings, anchor pins for mucosa-supported guides.
5. 3D printing in surgical-guide resin, washing, post-curing, metal sleeves fitted, checked on a printed model.
6. The guide ships with a report: implant positions, sleeves, drill lengths to use and sleeve offset.

Accuracy you should expect

A guide reduces deviation but does not eliminate it. Systematic reviews of static guided surgery report a mean deviation of 1.2 mm at the entry point, 1.4 mm at the apex and 3.5° in angle (Tahmaseb 2018); bone-supported guides deviate more, while tooth- and mucosa-supported guides showed no statistically significant difference (Raico Gallardo 2017). Plans should therefore keep at least 2 mm from the nerve canal and 1.5 mm from adjacent roots. Before surgery, please try the guide on the model and in the mouth, match the sleeves to the drill kit, disinfect according to the printing material’s instructions, and have a freehand fallback if the guide does not seat.

Turnaround

Usually 3–5 working days from the moment we have the CBCT, the scans and your approval of the plan. Shipping comes on top; see turnaround and shipping. The full workflow is described in surgical guides: what to send the lab.

Restorations after integration are on implant bridges and crowns. To discuss a specific case, contact our team or start through the ordering process.

Written for dentists and technicians. Khai Nguyen Dental Lab manufactures to clinical prescription only and does not sell directly to patients.

Pilot-drill guide or fully guided

A pilot guide directs only the first drill and the rest is done freehand; a fully guided protocol directs the whole drill sequence through the sleeves of a guided surgery kit. In a randomized trial by Younes et al. (2018) in partially edentulous patients needing two or more implants in the posterior maxilla, mean apical global deviation was 0.97 mm (maximum 1.98 mm) fully guided, 1.43 mm (maximum 2.72 mm) pilot-guided and 2.11 mm (maximum 4.84 mm) freehand. Although screw retention was planned for every implant, 5 of 26 freehand implants and 1 of 24 pilot-guided implants had to be restored with cement-retained restorations.

Please state the guide type on the prescription; a fully guided design needs the manufacturer’s guided kit.

Published accuracy, read in context

Tahmaseb et al. conclude that accuracy is within a clinically acceptable range in most situations but that a safety margin of at least 2 mm should be respected. The ITI Group 5 consensus report treats guided surgery as an additional tool, and notes that flapless guided surgery can place implants outside the keratinized mucosa. These are averages across studies with different techniques, not a guaranteed error for a single case.

CBCT and scan registration: errors go straight into the guide

The guide is designed on a model merged from CBCT and intraoral scan, so any registration error is carried into the implant position. Flügge et al. (2017), using data from 36 patients, found a mean deviation of 0.54 mm between surface scan and CBCT after registration, rising with the number of metal restorations from 0.36 mm (0–2 restorations) to 1.01 mm (more than 8); segmentation and the operator also had a significant effect.

• Tell us which teeth carry metal crowns, bridges or posts.
• Scan and CBCT must show the same mouth; after an extraction or a restoration change between them, rescan.
• When you approve the plan, check the overlay of the scan on the CBCT.

Sleeves and drill kit: what you must specify

Drills always have some play in the sleeve. In an in vitro study by Schneider et al. (2015), mean total lateral movement of the drill tip with the metal sleeves of two commercial systems was 0.75 mm and 0.91 mm; shorter drills and higher drill keys reduce it. We need:

• Implant manufacturer, and the name and version of the guided kit.
• Sleeve type, inner diameter and offset for that kit.
• Whether drill keys are used, and the drill lengths available.
• Mouth opening at the site, since guide, sleeve and drill add up in height.

Gingivectomy guide

A gingivectomy guide transfers the gingival outline of the approved diagnostic wax-up to the mouth; per our brochure, design takes 12 hours from receipt of complete data. We need both arch scans, smile photos and the approved wax-up, plus a CBCT if bone is also recontoured (crown lengthening). In a prospective case series by Enfedaque-Prat et al. (2025), 10 patients and 87 teeth, with 3D-printed guides designed from CBCT and scans, the mean absolute deviation between planned and final gingival margin at 6 months was 0.56 mm. On models, Ntovas et al. (2025) found that thicker soft tissue increased discrepancy and that guides with added supporting planes reduced it; please note gingival thickness if measured.

The implant guide workflow and FAQ are in surgical guides: what to send the lab.

Sources: Younes F et al. A randomized controlled study on the accuracy of free-handed, pilot-drill guided and fully guided implant surgery in partially edentulous patients. J Clin Periodontol. 2018;45(6):721-732; Tahmaseb A et al. The accuracy of static computer-aided implant surgery: a systematic review and meta-analysis. Clin Oral Implants Res. 2018;29(Suppl 16):416-435; Raico Gallardo YN et al. Accuracy comparison of guided surgery for dental implants according to the tissue of support. Clin Oral Implants Res. 2017;28(5):602-612; Wismeijer D et al. Group 5 ITI Consensus Report: Digital technologies. Clin Oral Implants Res. 2018;29(Suppl 16):436-442; Flügge T et al. Registration of cone beam computed tomography data and intraoral surface scans. Clin Oral Implants Res. 2017;28(9):1113-1118; Schneider D et al. In-vitro evaluation of the tolerance of surgical instruments in templates for computer-assisted guided implantology produced by 3-D printing. Clin Oral Implants Res. 2015;26(3):320-325; Enfedaque-Prat M et al. Accuracy of guided dual technique in esthetic crown lengthening. J Esthet Restor Dent. 2025;37(6):1284-1296; Ntovas P et al. Influence of soft tissue thickness, blade type, and guide design on computer-assisted esthetic crown lengthening. J Periodontol. 2025;96(11):1236-1246.