The ability to screw-retain single implant-supported restorations in the anterior maxilla: A CBCT analysis
| Autor: | Nikolaos Soldatos, Robin L Weltman, Erin K. Edmondson, Pedro M. Trejo |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
musculoskeletal diseases
Cone beam computed tomography medicine.medical_treatment Anterior maxilla Bone Screws Abutment Dental Abutments Crown (dentistry) 03 medical and health sciences 0302 clinical medicine Maxilla Medicine Maxillary central incisor Anterior teeth Retrospective Studies Dental Implants Orthodontics Crowns business.industry Single implant Dental Implant-Abutment Design Spiral Cone-Beam Computed Tomography 030206 dentistry musculoskeletal system equipment and supplies surgical procedures operative Dental Prosthesis Implant-Supported Implant Oral Surgery business |
| Zdroj: | The Journal of Prosthetic Dentistry. 128:443-449 |
| ISSN: | 0022-3913 |
| DOI: | 10.1016/j.prosdent.2021.01.004 |
| Popis: | Evidence to validate the routine use of angled screw-channel abutments in the anterior maxilla is sparse. If properly planned, they might provide surgical and prosthetic benefits.The purpose of this observational study was to determine the prevalence of digitally placed implants in the anterior maxilla that would allow screw-retained implant-supported restorations with either a straight or an angled screw-channel abutment.Two hundred cone beam computed tomography (CBCT) scans met the inclusion criteria for retrospective analysis and digital implant planning. Virtual implants were planned for randomly selected anterior maxillary teeth by using the anatomic crown and root position. Virtual abutments of varying angulation were attached to the implants to determine the ability to screw retain a restoration with either a straight or an angled screw-channel abutment.One hundred fifty-two (76%) sites required an angled screw-channel abutment to enable screw retention. Forty-eight (24%) sites allowed screw retention with a straight abutment. The percentage of implants requiring angled or straight abutments varied significantly among anterior teeth (P.005). One hundred nine (71.7%) angled screw-channel abutment sites required a 5-degree abutment, 41 (26.9%) required a 10-degree abutment, and 2 (1.3%) required a 15-degree abutment. Among the anterior teeth, lateral incisors presented a greater need for angled screw-channel abutments. None of the implants in the present study needed cement-retained restorations.Angled abutments allowed for screw-retained restorations on digitally planned implants in the anterior maxilla. The required angular correction to a screw-retained restoration was ≤15 degrees. Screw-retained restorations were frequently achievable (76%) with the use of angled screw-channel abutments or with straight abutments (24%), and lateral incisors presented a greater need for angled screw-channel abutments. |
| Databáze: | OpenAIRE |
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