Frequency of screw-retained angulated screw channel single crown following immediate implant placement and provisionalization in the esthetic zone: A cone beam computed tomography study

Joseph Y K Kan; Kitichai Rungcharassaeng; Pongrapee Kamolroongwarakul; Guo-Hao Lin; Hiroyuki Matsuda; Shi Yin; Hom-Lay Wang; Dennis Tarnow; Jaime L Lozada

doi:10.1111/cid.13227

Frequency of screw-retained angulated screw channel single crown following immediate implant placement and provisionalization in the esthetic zone: A cone beam computed tomography study

Clin Implant Dent Relat Res. 2023 Oct;25(5):789-794. doi: 10.1111/cid.13227. Epub 2023 May 26.

Authors

Affiliations

¹ Advanced Education in Implant Dentistry, Loma Linda University School of Dentistry, Loma Linda, California, USA.
² Department of Orthodontics and Dentofacial Orthopedics, Loma Linda University School of Dentistry, Loma Linda, California, USA.
³ Dental Center, Phyathai Hospital, Bangkok, Thailand.
⁴ Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, California, USA.
⁵ Private Practice, Chiba, Japan.
⁶ Advanced Education in Periodontics, Loma Linda University School of Dentistry, Loma Linda, California, USA.
⁷ Department of Periodontics & Oral Medicine, University of Michigan, Ann Arbor, Michigan, USA.
⁸ Department of Periodontology, Columbia College of Dental Medicine, New York City, New York, USA.

PMID: 37232408
DOI: 10.1111/cid.13227

Abstract

Objective: The purpose of this cone beam computed tomography (CBCT) study was to determine the frequency percentage of screw-retained crown using angulated screw channel (ASC) abutment for single immediate implant placement and provisionalization (IIPP) in the esthetic zone.

Methods: The CBCT images of 200 patients without disease and without metal restorations in maxillary anterior teeth were evaluated. The mid-sagittal-sectional CBCT images of maxillary anterior teeth (#6-#11) were created in an implant planning software, screen-captured, and transferred to a presentation program. Template of tapered implants with diameter of 3.5 mm (for central and lateral incisors) and 4.3 mm (for central incisors and canines) and lengths of 13, 15, and 18 mm were applied to the sagittal images to identify the IIPP cases. To qualify for IIPP, the implant must engage >35% bone with at least 1 mm of surrounding bone and no perforations. The IIPP cases were further divided into straight screw channel (IIPPSSC) abutment or 25-degree angulated screw channel abutment (IIPPASC), based upon its restorability. The frequency percentages of possible IIPP, IIPPSSC, and IIPPASC were reported and compared among all maxillary anterior teeth.

Results: A total of 1200 maxillary anterior teeth sagittal images from 200 patients (88 male and 112 female) with a mean age of 51.3 years (range 20-83 years) were evaluated in this study. The overall frequency percentages of IIPP, IIPPSSC, and IIPPASC possibility were 84% (74%-92%), 14% (10%-24%), and 75% (66%-87%), respectively.

Conclusion: Within the limitations of this CBCT study, 90% of single IIPP in the esthetic zone can be restored with screw-retained crown when utilizing ASC. In addition, the possibility of using a screw-retained restoration following IIPP increases about five times with ASC abutment compared to the SSC abutment.

Keywords: cone beam computed tomography; dental implants; esthetics; immediate placement; implant-supported dental prosthesis.

MeSH terms

Adult
Aged
Aged, 80 and over
Alveolar Process
Bone Screws
Cone-Beam Computed Tomography / methods
Crowns
Dental Implants*
Dental Implants, Single-Tooth*
Esthetics, Dental
Female
Humans
Male
Maxilla / diagnostic imaging
Maxilla / surgery
Middle Aged
Young Adult

Substances

Dental Implants