Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions

Hatayama, Takashi; Chiba, Ayaka; Kainose, Kimisuke; Nakajima, Masatoshi; Hosaka, Keiichi; Wakabayashi, Noriyuki; Foxton, Richard M.; Tagami, Junji

doi:10.4012/dmj.2017-160

Cited by 2 publications

(1 citation statement)

References 34 publications

(58 reference statements)

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“…When loading on the lingual side, stress concentration was likely to occur on the lingual side of the root. When loading horizontally, significant stress concentration may occur on both the buccal and lingual side of the roots [ 40 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Zeng,

Luo,

et al. 2024

BMC Oral Health

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Background Margin designs and loading conditions can impact the mechanical characteristics and survival of endocrowns. Analyzing the stress distribution of endocrowns with various margin designs and loading conditions can provide evidence for their clinical application. Methods Three finite element analysis models were established based on the margin designs: endocrown with a butt-joint type margin (E0), endocrown with a 90° shoulder (E90), and endocrown with a 135° shoulder (E135). The E0 group involved lowering the occlusal surface and preparing the pulp chamber. The E90 group created a 90° shoulder on the margin of model E0, measuring 1.5 mm high and 1 mm wide. The E135 group featured a 135° shoulder. The solids of the models were in fixed contact with each other, and the materials of tooth tissue and restoration were uniform, continuous, isotropic linear elasticity. Nine static loads were applied, with a total load of 225 N, and the maximum von Mises stresses and stress distribution were calculated for teeth and endocrowns with different margin designs. Results Compared the stresses of different models under the same loading condition. In endocrowns, when the loading points were concentrated on the buccal side, the maximum von Mises stresses were E0 = E90 = E135, and when there was a lingual loading, they were E0 < E90 = E135. In enamel, the maximum von Mises stresses under all loading conditions were E0 > E90 > E135. In dentin, the maximum von Mises stresses of the three models were basically similar except for load2, load5 and load9. Compare the stresses of the same model under different loading conditions. In endocrowns, stresses were higher when lingual loading was present. In enamel and dentin, stresses were higher when loaded obliquely or unevenly. The stresses in the endocrowns were concentrated in the loading area. In enamel, stress concentration occurred at the cementoenamel junction. In particular, E90 and E135 also experienced stress concentration at the shoulder. In dentin, the stresses were mainly concentrated in the upper section of the tooth root. Conclusion Stress distribution is similar among the three margin designs of endocrowns, but the shoulder-type designs, especially the 135° shoulder, exhibit reduced stress concentration.

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Section: Discussionmentioning

confidence: 99%

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Zeng,

Luo,

et al. 2024

BMC Oral Health

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Aesthetics in Removable Partial Dentures: Modification of the Proximal Plate and Retentive Lamellae in Kennedy Class II Scenarios

Ceraulo

2024

Prosthesis

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The removable partial denture, despite new technologies and new materials, continues to play a significant role in clinical dental practice. The purpose of the following study was to evaluate the design of new retention devices in Kennedy class II scenarios. For the study of “lamellar” retentive devices, four prosthetists were chosen. According to inclusion and exclusion criteria, prosthetists selected 16 patients (8 women and 8 men) whose upper arches had to be rehabilitated using a removable partial prosthesis. The results showed that the parameters taken into consideration, such as satisfaction, stability, aesthetics, and retention, had an average score that was higher than 3.30 (range 1–4), with an average standard deviation of 0.6225 in the four parameters, indicative that the data were relatively homogeneous and coherent. In conclusion, we can state that the skeletonized prosthesis with lamellar retentions, designed for Kennedy class II scenarios, has shown high acceptance in selected patients.

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Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions

Cited by 2 publications

References 34 publications

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Effect of margin designs and loading conditions on the stress distribution of endocrowns: a finite element analysis

Aesthetics in Removable Partial Dentures: Modification of the Proximal Plate and Retentive Lamellae in Kennedy Class II Scenarios

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