Occlusion on Implant Crowns: How Light Should Contacts Be?

The implant crown seats, the screw is torqued, and then comes the question every restoring dentist answers differently: how much should it touch? Some leave it so light that shimstock slides through in a firm clench. Others match the neighboring teeth, worried that a crown left out of the bite overloads them.

The caution has a real basis: an implant has no periodontal ligament. The evidence for any specific contact recipe is thinner than the confident rules suggest. Below: the physiology, the evidence on light contacts and overload, how to check contacts, and follow-up.

Quick Answer

Light, by most guidelines, but only at first. The usual target is graded contact: in light closure the natural teeth hold 12 µm shimstock while it just pulls through against a posterior implant crown; in firm closure everything holds, and posterior implant crowns get no excursive contacts. This is expert recommendation, not trial-proven. Light contacts grow heavier within months, and two studies found no outcome difference, so recheck at about 3 months and every year.

Why Do Implants Need Different Occlusion Than Teeth?

No ligament, almost no give

A tooth is suspended in a periodontal ligament that cushions load. A 2013 review puts mean axial tooth mobility at 25 to 100 µm, against 3 to 5 µm for an osseointegrated implant, with load on implants concentrating at the crestal bone (Yuan and Sukotjo, 2013). Teeth intrude slightly between light contact and firm closure; implants barely do, which is the rationale for making implant crowns slightly lighter (Stilwell, 2024).

Duller pressure sense, similar foil detection

Yet when 62 patients bit on copper foil strips, the thinnest foil they detected averaged 16.7 µm between an implant crown and an opposing tooth and 14.3 µm between two natural teeth, which the authors judged equivalent (Enkling et al., 2007). Patients can often feel a high implant crown; what they lack is the ligament's cushion.

Is "Implant-Protected Occlusion" Backed by Evidence?

Implant-protected occlusion aims to protect implants by reducing occlusal force on the prosthesis. The usual advice adds shallow anatomy, a narrow occlusal table and reduced cusp inclines, yet most implant occlusion concepts rest on expert opinion, anecdotal experience and animal studies (Yuan and Sukotjo, 2013).

What reviews and consensus statements conclude

Kim and colleagues wrote in their 2005 guidelines that there is no evidence-based, implant-specific concept of occlusion, and a 2015 review found the evidence insufficient for firm guidelines (Koyano and Esaki, 2015). A 2021 Best Evidence Consensus Statement concluded that the occlusion a dentist uses for tooth- or mucosa-supported prostheses may be used on implants until compelling evidence says otherwise (Goldstein et al., 2021).

What clinical studies show about light contacts

Measured with T-Scan on 37 posterior partial fixed prostheses on implants, the implant's share of total bite force rose from 7.46% at 2 weeks to 9.87% at 3 months, while control natural teeth fell from 13.78% to 11.43%; from 6 months on, the two were statistically similar (Luo et al., 2020). In 21 patients adjusted to implant-protected occlusion, force on the implant crowns was significantly higher at 3 and 6 months than at insertion (Madani et al., 2017).

Two studies compared light and normal contacts. In 50 patients with single molar implant crowns, "light" meant a 12 µm film could be pulled out in intercuspal position. Relative force on light crowns ranged from 4.91% to 10.34% over 12 months, against 10.45% to 18.15% on normal crowns; the authors found light occlusion not stable and saw no signs of overload in either group (Zhang et al., 2024). A retrospective study of 63 implants followed for up to 5 years found the same change and no difference in marginal bone loss, proximal contact loss or technical complications (Li et al., 2026). A light contact at delivery is a starting point, not a permanent state.

Does Occlusal Overload Cause Bone Loss Around Implants?

The case that it can

In monkeys, 5 of 8 implants under excessive lateral load lost osseointegration within 4.5 to 15.5 months, while implants left to collect plaque stayed integrated but lost an average of 1.8 mm of bone (Isidor, 1996). A 2022 review of 7 clinical studies found 4 reporting a correlation between overload and crestal bone loss, all at moderate to serious risk of bias (Di Fiore et al., 2022). A 2025 review called excessive loading a critical contributor to bone loss and peri-implantitis, though it mixed clinical studies with animal work, finite element models and case reports (Mojaver et al., 2025).

The case that inflammation matters more

In dogs with healthy mucosa, 8 months of supra-occlusal contact caused no loss of osseointegration or marginal bone (Heitz-Mayfield et al., 2004). A review for the Third EAO Consensus Conference (2012) judged all 16 clinical studies it considered at high risk of bias; in animals, overload without inflammation did not harm osseointegration, while overload with inflammation increased plaque-induced bone loss (Naert et al., 2012; Klinge and Meyle, 2012). The 2017 World Workshop added that progressive crestal bone loss without soft tissue inflammation is rare (Schwarz et al., 2018).

Where the evidence agrees

Mechanical complications are less disputed: overload may lead to screw loosening or fracture and to abutment, prosthesis or porcelain fracture (Yuan and Sukotjo, 2013). Controlled contacts protect the components; healthy tissue protects the bone. See Why Implant Screws Loosen.

Which Occlusal Scheme Fits Which Situation?

How Should You Check Contacts on an Implant Crown?

Shimstock for graded contact

Bausch, for example, makes a metallized shimstock film 12 µm thick. A 2024 review, illustrated with an ITI graphic, sets these targets (Stilwell, 2024):

• Light closure: natural teeth hold shimstock; it just pulls through between an implant crown and a tooth, and pulls through easily between two implant restorations.
• Firm closure: all opposing posterior teeth and implant restorations hold it.
• Excursions: no dynamic contacts on posterior implant crowns; natural teeth guide where possible.

The step from "hold" to "drag" is small: in a Harvard study of 10 participants, prototype crowns adjusted to each differed by a mean of 130 µm at the occlusal contacts (Cao et al., 2026). Adjust in small steps and recheck.

Articulating paper shows where, not how hard

Paper comes in thicknesses such as 40, 100 and 200 µm (Bausch). Under a testing machine, mark area showed no direct relationship with load (Carey et al., 2007), and in 30 subjects only about 6.7% of mark area could be explained by force (Qadeer et al., 2012).

Digital occlusal analysis

In 20 patients with implant restorations, T-Scan found high points on the implants in most patients that paper did not reveal (Chowdhary and Bukkapatnam, 2023). No indicator is neutral, though: in a lab study, the marking products generally altered the contact forces, and T-Scan was an extreme outlier (Mitchem et al., 2017). Use it alongside shimstock.

What Changes for Cantilevers and Bruxers?

Cantilevers

A 2013 review cites recommendations for minimal cantilevers alongside a systematic review that found survival comparable to prostheses without extensions, with veneer fracture and screw loosening the most common complications (Yuan and Sukotjo, 2013). On full-arch prostheses, several authors recommend about 100 µm of clearance on the cantilever (Berzaghi et al., 2025). Survival data: Cantilever Bridges.

Bruxers

Parafunction has been linked to porcelain chipping and screw loosening (Yuan and Sukotjo, 2013); see Restorations for Bruxers. A 2024 review calls a hard occlusal splint prudent with bruxism (Stilwell, 2024). The 2026 Global Consensus suggests a guard after fixed implant prostheses in the edentulous maxilla, while noting a significant lack of high-quality evidence for routine use in bruxers (Stilwell et al., 2026).

How Should You Record the Bite for the Lab?

Implant crown occlusion is set in the design from your bite record, so a wrong bite undoes everything above. Bite scans are covered in High Crowns and Open Contacts, and scan body technique in How to Scan Implants.

What Should You Do After Delivery?

• At delivery: check light closure, firm closure, then excursions; adjust the implant crown to reinstate graded contact and repolish adjusted surfaces to a high shine (Stilwell, 2024).
• At about 3 months: force on implant crowns rose significantly by 3 months and kept rising through 24 months (Luo et al., 2020), and the 21-patient study's authors call periodic adjustment necessary (Madani et al., 2017). Book this visit at delivery.
• Every year: check patient input, restoration integrity, occlusal scheme with any night guard, and spatial changes such as open proximal contacts (Stilwell, 2024). Retrievable crowns make corrections simpler; see Screw-Retained vs. Cement-Retained Implant Crowns.

Implant Restorations at Elegant Dental Laboratory

• Screw-retained and cement-retained implant restorations, custom screw-retained abutments and full-arch work, with design libraries for all major implant systems.
• Compatible scan bodies and titanium bases accepted, scan bodies available to practices, and digital scans reviewed before production (submit a digital case).
• Every case is made in house in Brooklyn by more than 35 technicians, including hard, soft and dual-laminate night guards.
• 5 business day standard turnaround on most restorative cases, rush options, and warranties of up to 7 years on final restorations and up to 20 years on screw-retained implant abutments (policies and warranties).
• Send a case: free pickup and delivery by our own drivers every business day during lab hours in all five New York City boroughs and 13 northern New Jersey counties; UPS labels anywhere. Call 877-335-5221.

FAQ

Should an implant crown be out of occlusion?

Usually not completely. Most guidelines aim for graded contact: light in light closure, full contact in firm closure.

What shimstock thickness should I use?

About 12 µm, the film thickness that defined light occlusion in the studies above.

Do light contacts on implant crowns stay light?

No. In T-Scan studies, force on implant crowns rose over the first 3 to 12 months.

Does occlusal overload cause peri-implant bone loss?

It is contested. Animal studies suggest overload mainly aggravates bone loss when inflammation is present.

Should posterior implant crowns have lateral contacts?

Recommendations say no; natural teeth should guide where possible.

Reviewed by Gary Fingerman, founder and CEO of Elegant Dental Laboratory, Brooklyn, New York (founded 2007). Last reviewed: October 1, 2026. Most implant occlusion guidelines are expert recommendations; use them alongside your own clinical judgment.