Survival Rates of Implants That Have Compromised the Adjacent Teeth and the Associated Complications: An Opg Retrospective Study
This retrospective study evaluated survival rates of implants compromising adjacent teeth and associated complications. Medical records and orthopantomographic images of 1132 patients and 1478 implants were retrospectively analyzed. Finally, 96 patients (52 females, 44 males) with 111 malpositioned implants were included in the study. The mean follow-up of the study was 32 ± 14 months. The patients were divided into 2 core groups: (1) adjacent teeth and dental implants were considerably close but tangent to each other (TAN), and (2) dental implant cutting the roots of the adjacent tooth (CUT). In addition, the CUT group was divided into 2 subcategories considering the possible cause of malangulation as angled implant (AI) or angled adjacent tooth (AT). Damage to adjacent teeth, future treatment requirements, and the survival rates of the implants were recorded. Among the 111 implants, 4 (3.6%) implants failed, all of which belonged to the CUT category and the AI subgroup. Among the 88 preoperatively vital adjacent teeth, root canal treatment was performed in 18 (20.5%) teeth, whereas 2 (2.3%) teeth were extracted due to malpositioned implanting in follow-ups. The placement of implants too close to the adjacent teeth and even cutting direction did not have a statistically significant effect on the survival rates of implants. However, this could cause adjacent teeth to undergo unnecessary root canal treatment or extraction. Patients with malpositioned adjacent teeth or dilacerated root(s) adjacent to the edentulous area are at a higher risk for malpositioned implant complications. Most implant malposition complications are observed in the first premolar region (37% cases). Therefore, more attention should be given while placing implants in the first premolar region.

Angular measurements were made using computer software to categorize cases. Implant–tooth relationship is accepted as tangent at values less than 15°. It is categorized as an implant or tooth angulation according to the occlusal plane at values above 15°.

Sample radiographs belonging to the tangent (TAN) category.

Sample radiographs belonging to the angled implant (AI) subcategory of the CUT category.

Sample radiographs belonging to the angled tooth (AT) subcategory of the CUT category.

Radiographs of 2 cases in which the adjacent tooth had to be extracted.

Postoperative radiographs of 4 failed implants (out of 111 implants).
Contributor Notes
Notes The following are author contributions. Conceptualization: Kucukkurt, Moharamnejad; data curation: Kucukkurt, Moharamnejad; formal analysis: Kucukkurt; funding acquisition: Kucukkurt; investigation: Kucukkurt, Moharamnejad; methodology: Kucukkurt, Moharamnejad; project administration: Kucukkurt, Moharamnejad; resources: Kucukkurt, Moharamnejad; software: Kucukkurt; supervision: Moharamnejad; validation: Kucukkurt, Moharamnejad; visualization: Kucukkurt; writing—original draft: Kucukkurt; writing—review and editing: Moharamnejad.