Positioning errors of dental implants and their associations with adjacent structures and anatomical variations: A CBCT-based study
Ribas Beatriz Ribeiro, Nascimento Eduarda Helena Leandro, Freitas Deborah Queiroz, dos Anjos Pontual Andrea, dos Anjos Pontual Maria Luiza, Perez Danyel Elias Cruz, Ramos-Perez Flavia Maria Moraes,
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( Ribas Beatriz Ribeiro ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
( Nascimento Eduarda Helena Leandro ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
( Freitas Deborah Queiroz ) - University of Campinas Piracicaba Dental School Department of Oral Diagnosis
( dos Anjos Pontual Andrea ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
( dos Anjos Pontual Maria Luiza ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
( Perez Danyel Elias Cruz ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
( Ramos-Perez Flavia Maria Moraes ) - Federal University of Pernambuco Department of Clinical and Preventive Dentistry
Abstract
Purpose: The objective of the present study was to evaluate the prevalence of dental implants positioning errors and their associations with adjacent structures and anatomical variations by means of cone-beam computed tomography (CBCT).
Materials and Methods: CBCT images of 207 patients (584 dental implants) were evaluated by 2 oral radiologists. The distance between the implant and the adjacent teeth/implants was measured and classified as adequate (≥1.5 mm and ≥3 mm, respectively) or inadequate. The presence of thread exposure, cortical perforation, implant dehiscence, implant penetration into adjacent structures, and anatomical variations was also recorded. The incisor canal diameter and the depth of the concavity of the submandibular fossa were measured in order to evaluate their correlations with the frequency of implant penetration in these structures. Descriptive analyses, the Fisher exact test, and Spearman correlation analysis were performed (α=0.05).
Results: The overall prevalence of positioning errors was 82.9%. The most common error was the inadequate distance between the implant and the adjacent teeth/implants. The presence of anatomical variations did not significantly influence the overall prevalence of errors (P>0.05). There was a positive correlation between the diameter of the incisor canal and the frequency of implant penetration in this structure (r=0.232, P<0.05).
Conclusion: There was a high prevalence of dental implant positioning errors, and positioning errors were not associated with the presence of anatomical variations. Professionals should be aware of the space available for implant placement during the preoperative planning stage.
키워드
Anatomic Variation; Cone-Beam Computed Tomography; Dental Implant
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