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Clinicians often prioritize the aesthetic outcome when planning immediate implant placement in the anterior maxilla. Achieving the ideal screw channel emergence is difficult because the bone anatomy often dictates a labial inclination. Recently, a radiographic study utilized CBCT to assess the feasibility of angled screw channel systems during virtual planning. This research evaluated 295 sites across central incisors, lateral incisors, and canines to compare access channel angulations.
The results showed significant variability among different tooth types. For instance, canine sites demonstrated the highest percentage of straight access channels at 51%. Conversely, lateral incisors proved to be the most challenging, with only 5.1% allowing for straight access. Furthermore, the study observed a significant increase in access through the cingulum when using angled screw channel systems. These systems allow for angular corrections ranging from 5 to 25 degrees to improve prosthetic emergence.
Proper planning with CBCT is essential for identifying these restorative needs early. However, clinicians must remember that lateral incisors frequently require more extreme angulation corrections. Therefore, understanding these probabilities helps dentists manage patient expectations and technical requirements during surgery. Overall, the transition from straight to angled access significantly enhances the probability of a successful screw-retained restoration while maintaining the integrity of the incisal edge.
Lateral incisors have the lowest probability of straight screw access. Using these systems ensures the screw hole emerges lingually rather than through the incisal edge, preserving aesthetics.
Research indicates that corrections between 5 and 25 degrees are often sufficient to move the access channel from the incisal edge to the cingulum area.
Yes, CBCT is vital for virtual planning. It allows clinicians to predict the implant trajectory and determine if an angled channel is required before the surgical procedure.
Disclaimer: This content is for informational and educational purposes only. It does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Khan MT et al. Straight versus angled screw channel considerations in anterior maxilla using CBCT for planning immediate implant placement: A radiographic study. J Prosthodont. 2026 Feb 21. doi: 10.1111/jopr.70110. PMID: 41722080.
Kan JY et al. Incidence of straight-channel screw-retained single crown following immediate implant placement and provisionalization in the esthetic zone: A CBCT study. Int J Oral Maxillofac Implants. 2021;36(4):793-798.
Gultekin P et al. Angle-corrected abutments in the aesthetic zone: A systematic review. Journal of Oral Rehabilitation. 2024.
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A radiographic study evaluating the probability of straight and angled screw channel access during immediate implant planning in the anterior maxilla....
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