Exploring Implant Crowns in Modern Dentistry

This article examines implant crowns in modern restorative dentistry, focusing on cement-retained, screw-retained, and screwmentable designs supported by current evidence-based research. It explains how prosthetic retention influences retrievability, peri-implant tissue health, occlusal stability, and maintenance outcomes. It reviews how surgical guides, used in guided implant surgery, improve three-dimensional implant positioning, angulation control, and prosthetic accuracy according to contemporary implant literature.

Why Implant Crown Retention Matters?

The retention mechanism of an implant-supported crown affects:

• • Esthetic outcomes

• • Risk of peri-implantitis

• • Access for maintenance and repair

• • Occlusal load distribution

• • Prosthetic accuracy

Retention choice is not merely a technical preference—it determines biological stability and mechanical longevity.

What are the Types of Crown Implants?

The main types of crown implants are discussed below.

1. Cement Retained Implant Crowns

Cement-retained implant crowns are prized for their aesthetic appeal and clinical benefits. By controlling the emergence profile, these crowns enhance esthetics, function, and the longevity of implant restorations. Custom implant abutments play a pivotal role in achieving optimal results. They provide a tailored emergence profile, preventing issues like black triangles and improved overall smile appearance. Additionally, custom abutments offer a stable platform for the crown, facilitating improved chewing and speaking for patients.

Studies such as, “A prospective clinical study comparing the emergence profile of two custom abutment designs,” and, “A clinical evaluation of custom abutments for single-tooth implant restorations”, have affirmed the esthetic and functional advantages of custom implant abutments. Furthermore, controlling the angle of the custom abutment wall can reduce hydraulic forces, as highlighted in the study, “Control of the Emergence Profile to Prevent Hydraulic Forces.”

While cementation remains the standard of care in dental implantology, it’s not without challenges. One significant drawback is the difficulty of removing excess cement, which has been linked to complications like peri-implant mucositis and peri-implantitis. Recent research has shown that dental professionals often use significantly more cement than necessary, emphasizing the need for caution in cementation processes Exploring Implant Crowns. 

To address the issue of excess cement in cement-retained implant crowns, the idea of a duplicated abutment method has been proposed. This technique has been effective in removing excess cement, with studies reporting an average removal rate of 99%. The duplicate abutment method involves creating a duplicate of the custom abutment impression material, helping prevent complications associated with residual cement. 

Advantages and Disadvantages of Cement-Retained Implant Crowns

Cement-retained implant crowns offer several advantages, including:

• • Esthetic appeal, providing a natural-looking restoration.

• • Compensation for improperly inclined implants.

• • Versatility in handling difficult angulations.

• • Elimination of screw access holes, enhancing aesthetics further.

However, cement-retained implant crowns come with their set of disadvantages, such as:

• • Difficulty in removal when replacement or repair is needed.

• • Increased risk of peri-implantitis due to residual cement.

2. Screw-Retained Implant Crowns

Screw-retained implant crowns provide secure retrievability, making them ideal for maintenance, repairs, and surgical intervention. These restorations can be easily removed and reattached, reducing the risks associated with damaging the crown or implant abutment. Innovations in angulated screw channel technologies have expanded the range of applications for screw-retained restorations.

Advantages and Disadvantages of Screw-Retained Implant Crowns

The advantages of screw-retained implant crowns include:

• • Predictable retrievability for maintenance and repairs.

• • Ease of surgical interventions, with better access to the surgical site.

• • Suitability for long-span and cantilevered prosthesis.

• • Applicability for provisional restorations in conditioning soft tissue and finalizing the emergence profile.

The disadvantages of screw-retained implant crowns include:

• • Aesthetic compromises due to the presence of a screw access hole.

• • Challenges in establishing optimal occlusal and proximal contacts.

• • Higher risk of fracture compared to cement-retained crowns.

3. Screwmentable Implant Crowns (SCRP)

Screwmentable implant crowns (SCRP) offer a balanced solution, combining the benefits of cement and screw-retained crowns while minimizing their limitations. They facilitate extramural cementation, eliminating the risk of cement-related peri-implantitis. It has been shown that SCRP crowns are associated with significantly lower risk of peri-implantitis compared to cemented crowns.

Advantages and Disadvantages of ScrewMentable Implant Crowns

The advantages of screwmentable implant crowns include:

• • Additionally, SCRP crowns are easily retrievable, ensuring straightforward maintenance and adjustments.

• • They offer efficient solutions for achieving optimal occlusal and proximal contacts without excessive screw manipulation.

The disadvantages of screwmentable implant crowns include:

• • Visible screw access hole, the aesthetic impact is generally less pronounced compared to screw-retained crowns.

• • Requires precise extraoral cementation protocol.

How to Choose the Right Implant Crown Retention System?

Follow the rules given below.

Choose Cement-Retained When:

• • Implant angulation is severely compromised

• • Esthetics are primary concern

• • Deep subgingival margins require concealment

Choose Screw-Retained When:

• • Retrievability is essential

• • Full-arch restorations are planned

• • Maintenance accessibility is a priority

Choose SCRP When:

• • You want retrievability with minimal biological risk

• • Esthetics must remain optimal

• • Cement-related complications must be avoided

What is the Difference Between Cement-Retained vs Screw Retained vs SCRP Crown Implants?

The main difference is summarized in the table below.

Feature	Cement-Retained	Screw-Retained	Screwmentable (SCRP)
Retrievability	Low	High	High
Peri-Implantitis Risk	Higher	Lower	Lowest
Esthetics	Excellent	Moderate	Excellent
Maintenance Access	Limited	Excellent	Excellent
Technical Sensitivity	Moderate	Moderate	Higher

How does a custom abutment improve implant crown retention?

Custom abutments and angled screw channels are game-changers in implant dentistry. Custom abutments provide superior prosthetic adaptability, enhancing both aesthetics and function. Angled screw channels address challenges related to screw access hole angulation, expanding the applicability of screw-retained restorations, especially in cases with challenging implant angles. 

How do custom impression copings improve the fit and long-term success of implant crowns?

Custom impression copings have gained recognition for their role in improving accuracy and patient satisfaction. They are custom-made to match specific implants and patient tissue anatomy, ensuring precise impressions. Patients report higher satisfaction with restorations created using custom impression copings, thanks for their superior fit and accuracy. 

Which implant crown retention method has the lowest risk of peri-implantitis?

Screw-retained and screwmentable crowns generally present lower biological risk because they avoid subgingival cement remnants.

Is a screw-retained crown stronger than a cement-retained crown?

Screw-retained crowns often provide superior retrievability and predictable preload stability, but strength depends on design, material, and occlusion.

Are digital scan bodies more accurate than traditional impression copings?

Digital workflows can improve accuracy in many cases, particularly for full-arch restorations, but technique sensitivity remains important.

Why Jig Verifications are Crucial and What Alternatives are Available?

Verification jigs are crucial tools for fabricating multiple implant bridges for All on X prosthetics. They validate the accuracy of implant placement and alignment, ensuring that lab models faithfully represent the patient’s oral implant positions. This early detection of errors saves time and resources and prevents patient discomfort.

Alternative techniques like ScanDAR system and photogrammetry scanners often have promising solutions. ScanDAR accurately scans and tracks scan bodies, ensuring non-distorted scans for precise implant crown fitting. Photogrammetry scanners provide a digital workflow for accurate implant-supported restorations without the need for traditional impressions or verification jigs.

Dental implantology continues to evolve with ongoing advancements. The choice between cement-retained, screw-retained, and screwmentable implant crowns depends on various factors. At Infinia Dental Lab, we remain committed to staying at the forefront of these dental implant innovations to ensure that our valued clients receive the highest quality implant crowns and restorations, backed by the latest advancements in the field of dentistry. 

Noteable sources for futher reading:

[1] “A clinical evaluation of custom abutments for single-tooth implant restorations.” by M.A. Romano, et al., Journal of Prosthodontics, 2008.

[2] “A prospective clinical study comparing the emergence profile of two custom abutment designs.” by M.J.C. van den Heuvel, et al., Journal of Oral Rehabilitation, 2009.

[3] “The effect of custom abutment design on peri-implant soft tissue conditions: A systematic review.” by M.J. Ferrari, et al., Journal of Dentistry, 2013.