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Ideal placement of an implant considering the positional relationship to an opposing tooth in the first molar region: a three-dimensional finite element analysis.
Int J Implant Dent. 2020 Jul 01; 6(1):31.IJ

Abstract

BACKGROUND

Excessive loading from the occlusion is known as a major pathological factor in implant failure. The force applied to the implant varies depending on the positional relationship to an opposing tooth in clinical cases. However, no studies have clarified the relationship between the discrepancy and mechanical complications.

MATERIALS AND METHODS

The study enrolled patients whose mandibular first molar was missing and was opposed by a natural maxillary first molar. The horizontal and vertical distance between the residual ridge and the occlusal surface of the maxillary first molar were measured from computerized tomograms. Subsequently, four finite element models were constructed in combinations of horizontal and vertical discrepancies. Additionally, the effect of inclined implantation and angled abutments were examined in a large clearance model. Maximum von Mises stress values generated in abutments under 90° or 60° loading vectors were compared with a three-dimensional finite element method.

RESULTS

Data from 123 subjects (39 males and 84 females, average age 55.2 ± 11.4 (SD) years) were collected for the analyses. Under all conditions, the stress on the load side (the buccal side) was concentrated on the platform, and the stress on the opposite side (the lingual side) was concentrated on the top of the abutment tube inserted into the implant. In comparison to 90° loading vectors, the maximum von Mises stresses of each model were 1.20 to 2.67 times under 60° loading vectors. For inclined implantation, the maximum stress was 8.4% less at a 90° load and 9.7% less at a 60° load compared with vertical implantation. With angled abutments, the maximum stress was 15.7% less at a 90° load and 30.0% less at a 60° load compared with vertical implantation.

CONCLUSION

In cases of progressive alveolar resorption with a large clearance between the implant and the opposing teeth, a higher stress concentration was observed at the joint between the implant and the abutment. Our findings also showed that stress concentration around this area can be reduced by the use of inclined implantation and angled abutments under the condition of a horizontal offset between the implant and opposing teeth.

Authors+Show Affiliations

Private Dental Office, Moriyama, Shiga, Japan.Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka, 565-0871, Japan. masahiro@dent.osaka-u.ac.jp.Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka, 565-0871, Japan.Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka, 565-0871, Japan.Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8, Yamadaoka, Suita, Osaka, 565-0871, Japan.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32607761

Citation

Morita, Jun, et al. "Ideal Placement of an Implant Considering the Positional Relationship to an Opposing Tooth in the First Molar Region: a Three-dimensional Finite Element Analysis." International Journal of Implant Dentistry, vol. 6, no. 1, 2020, p. 31.
Morita J, Wada M, Mameno T, et al. Ideal placement of an implant considering the positional relationship to an opposing tooth in the first molar region: a three-dimensional finite element analysis. Int J Implant Dent. 2020;6(1):31.
Morita, J., Wada, M., Mameno, T., Maeda, Y., & Ikebe, K. (2020). Ideal placement of an implant considering the positional relationship to an opposing tooth in the first molar region: a three-dimensional finite element analysis. International Journal of Implant Dentistry, 6(1), 31. https://doi.org/10.1186/s40729-020-00223-9
Morita J, et al. Ideal Placement of an Implant Considering the Positional Relationship to an Opposing Tooth in the First Molar Region: a Three-dimensional Finite Element Analysis. Int J Implant Dent. 2020 Jul 1;6(1):31. PubMed PMID: 32607761.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ideal placement of an implant considering the positional relationship to an opposing tooth in the first molar region: a three-dimensional finite element analysis. AU - Morita,Jun, AU - Wada,Masahiro, AU - Mameno,Tomoaki, AU - Maeda,Yoshinobu, AU - Ikebe,Kazunori, Y1 - 2020/07/01/ PY - 2020/02/26/received PY - 2020/04/27/accepted PY - 2020/7/2/entrez PY - 2020/7/2/pubmed PY - 2020/7/2/medline KW - CBCT KW - Dental implants KW - Finite element analysis KW - Stress distribution SP - 31 EP - 31 JF - International journal of implant dentistry JO - Int J Implant Dent VL - 6 IS - 1 N2 - BACKGROUND: Excessive loading from the occlusion is known as a major pathological factor in implant failure. The force applied to the implant varies depending on the positional relationship to an opposing tooth in clinical cases. However, no studies have clarified the relationship between the discrepancy and mechanical complications. MATERIALS AND METHODS: The study enrolled patients whose mandibular first molar was missing and was opposed by a natural maxillary first molar. The horizontal and vertical distance between the residual ridge and the occlusal surface of the maxillary first molar were measured from computerized tomograms. Subsequently, four finite element models were constructed in combinations of horizontal and vertical discrepancies. Additionally, the effect of inclined implantation and angled abutments were examined in a large clearance model. Maximum von Mises stress values generated in abutments under 90° or 60° loading vectors were compared with a three-dimensional finite element method. RESULTS: Data from 123 subjects (39 males and 84 females, average age 55.2 ± 11.4 (SD) years) were collected for the analyses. Under all conditions, the stress on the load side (the buccal side) was concentrated on the platform, and the stress on the opposite side (the lingual side) was concentrated on the top of the abutment tube inserted into the implant. In comparison to 90° loading vectors, the maximum von Mises stresses of each model were 1.20 to 2.67 times under 60° loading vectors. For inclined implantation, the maximum stress was 8.4% less at a 90° load and 9.7% less at a 60° load compared with vertical implantation. With angled abutments, the maximum stress was 15.7% less at a 90° load and 30.0% less at a 60° load compared with vertical implantation. CONCLUSION: In cases of progressive alveolar resorption with a large clearance between the implant and the opposing teeth, a higher stress concentration was observed at the joint between the implant and the abutment. Our findings also showed that stress concentration around this area can be reduced by the use of inclined implantation and angled abutments under the condition of a horizontal offset between the implant and opposing teeth. SN - 2198-4034 UR - https://www.unboundmedicine.com/medline/citation/32607761/Ideal_placement_of_an_implant_considering_the_positional_relationship_to_an_opposing_tooth_in_the_first_molar_region:_a_three-dimensional_finite_element_analysis L2 - https://link.springer.com/article/10.1186/s40729-020-00223-9 DB - PRIME DP - Unbound Medicine ER -
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