When a dental implant replaces a tooth, the implant itself sits in the bone, but the part you see is the crown. How that crown attaches to the implant matters more than most patients realize. A 2025 research review compared two approaches: angled screw-channel crowns, often called ASC crowns, and traditional cemented crowns. If you are considering dental implants in Citrus Heights, especially for a front tooth, this review offers useful, honest answers about bone health, appearance, and gum health.
Two Ways to Attach a Crown
A cemented crown is glued onto a small connector, called an abutment, that sits on the implant. It looks and feels much like a crown on a natural tooth, and dentists have used this method for many years. A screw-retained crown, by contrast, is held in place with a tiny screw. The screw channel is the small opening through which the screw is tightened, and it is later sealed with a tooth-colored filling. Angled screw-channel crowns are a newer variation: the channel can be angled away from the front of the tooth, so the screw opening does not have to sit right in the middle of the visible surface. That design is especially helpful for front teeth, where the implant angle might otherwise push the screw hole into a spot everyone can see.
What the Researchers Did
This was a systematic review and meta-analysis, meaning the researchers gathered earlier studies, applied strict inclusion rules, and combined the results. They searched databases through January 2025, screened 973 studies, and ended up with 4 studies covering 167 single nonmolar implant crowns. These were crowns on single teeth other than molars, including front teeth and premolars. The researchers compared bone levels, gum measurements, appearance scores, technical problems, and implant failures between the two crown types.
Bone Levels: A Small Edge, Not a Proven Win
One key measure was the marginal bone level, the height of the bone around the top of the implant. The difference favored angled screw-channel crowns, but it was small and not statistically significant: a mean difference of -0.03, with a 95% confidence interval from -0.12 to 0.06, and a p-value of 0.57. In plain language, the bone results for the two crown types looked very similar, and the tiny edge for screw-channel crowns could easily have happened by chance. For patients, the takeaway is reassuring: neither crown type showed a clear bone advantage in this review.
Appearance: Also Very Close
Appearance matters a great deal for front teeth, so the researchers also compared pink esthetic scores, which rate how natural the gum tissue around the crown looks. Here again, the change in scores favored angled screw-channel crowns, but the difference was not statistically significant: a mean difference of -0.18, with a 95% confidence interval from -0.88 to 0.51, and a p-value of 0.61. In everyday terms, both crown types produced good-looking results in these studies.
Bleeding and Gum Health
One area where screw-channel crowns looked more promising was bleeding on probing, the gentle test dentists use to check gum inflammation. Less bleeding on probing is expected with angled screw-channel crowns. One likely reason is cement itself: with a cemented crown, a small amount of excess cement can remain hidden below the gumline, irritating the tissues. A screw-retained crown avoids cement entirely, so that particular risk disappears. The review found no significant differences in probing pocket depths, which measure how deep the space is between the gum and the crown, so overall gum health looked comparable between the two approaches.
Complications and Failures
Patients often worry about something going wrong, such as a crown loosening, chipping, or the implant failing. In this review, there were no significant differences between angled screw-channel crowns and cemented crowns in technical complications or implant failure. Either option can work well when it is planned and fitted carefully by an experienced clinician.
What This Means for Citrus Heights Patients
So which crown should you choose? The honest answer from this review is that both options perform similarly on bone, appearance, and complications, with a possible gum-health edge for screw-channel crowns. The best choice often depends on your individual situation: the position and angle of your implant, how much space is available, how visible the tooth is when you smile, and how easy the crown will be to remove if it ever needs repair. A screw-retained crown can be removed by unscrewing it, which can be an advantage if repairs are ever needed.
At Expert Dental Group, Dr. Leila Nikpour is a prosthodontist with more than 15 years of dentistry experience, and the practice has placed 2,500+ dental implants. Treatment planning includes in-house 3D CBCT imaging, which shows the bone and implant position in detail before the crown is designed. A consultation with a prosthodontist in Roseville can help you weigh these crown options for your own smile and choose the approach that fits your tooth, your bite, and your goals.
References
Atieh MA, et al. J Esthet Restor Dent. 2025;37(7):1706-1720. DOI: https://doi.org/10.1111/jerd.13463. PubMed: https://pubmed.ncbi.nlm.nih.gov/40108886/
Frequently Asked Questions
What is an angled screw-channel implant crown?
An angled screw-channel crown is a screw-retained crown whose screw opening can be angled away from the front surface of the tooth. This lets the dentist hide the screw access hole in a less visible spot, which is especially useful for front teeth where the implant angle might otherwise place the hole in plain view.
Are screw-retained crowns better than cemented crowns?
In this 2025 review, the two types performed very similarly for bone levels, appearance, technical complications, and implant failure, with no significant differences. Screw-channel crowns showed an expectation of less bleeding on probing, but neither type emerged as a clear overall winner.
Why might cement cause problems under the gum?
With a cemented crown, a small amount of excess cement can remain hidden below the gumline, where it can irritate the gum tissue and contribute to inflammation. Screw-retained crowns avoid cement entirely, which removes that particular risk, though both types still need good cleaning and regular checkups.
Can a screw-retained crown be removed if it needs repair?
Yes, one practical advantage of a screw-retained crown is that it can be removed by unscrewing it, which can make repairs or adjustments simpler. A cemented crown is harder to remove without cutting it, so retrievability is one factor your dentist may consider when recommending a crown type.
Which crown type is best for a front tooth?
There is no single best answer for every front tooth. The choice depends on your implant angle, smile line, bite, and how easy the crown should be to service later. A consultation and detailed imaging help your dentist recommend the option that gives you the most natural look with the healthiest gum outcome.
Visit Expert Dental Group
Expert Dental Group is located at 5070 Foothills Blvd, Suite 2, Roseville, CA 95747. Call (916) 888-1646 to schedule a consultation. Office hours are Mon–Fri 9–6, Sat 9–1.