Effective scoring of scapha prevents helix irregularity in prominent ear correction - A biomechanical study

Tomohisa Nagasao, Junpei Miyamoto, Yusuke Shimizu, Shogo Kasai, Kazuo Kishi, Tsuyoshi Kaneko

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background: As the antihelix is created in the operation for prominent ear, the helix often presents irregularities. This biomechanical study aims to elucidate effective techniques to prevent these irregularities. Methods: Finite element models were produced simulating 10 prominent ears. The scaphas of the 10 models were thinned to simulate scoring or abrasion of the cartilage. The thinning was conducted in four fashions. In the first group, no thinning was conducted (Non-Scoring Models); in the second group, the upper half of the scapha was thinned (Upper-Scoring Models); in the third group, the lower half of the scapha was thinned (Lower-Scoring Models); in the fourth group, the whole scapha was thinned (Whole-Scoring Models). Mattress sutures were applied to create the antihelix to simulate Mustarde's in-suture technique. Thereafter, transformation of the helix's contour was evaluated. Results: Irregularity developed on the upper region of the helix with Non-Scoring and Lower-Scoring Models; the degree of the upper-region's irregularity was reduced with Upper-Scoring Models and Whole-Scoring Models. Although the edge of the helix moved in the posterior-medial direction with other type models, it moved in the anterior direction with Whole-Scoring Models. Conclusion: Irregularity of the upper region of the helix can be prevented by performing scoring or abrasion of the upper part of the scapha. The prominence of the helix and width of the auricle are adjustable by varying the areas of the scapha receiving scoring or abrasion. These findings are useful in improving operative outcomes in the treatment of prominent ears.

Original languageEnglish
Pages (from-to)711-717
Number of pages7
JournalJournal of Cranio-Maxillofacial Surgery
Volume42
Issue number6
DOIs
Publication statusPublished - 2014

Fingerprint

Ear
Suture Techniques
Sutures
Cartilage
Direction compound

Keywords

  • Antihelix
  • Cartilage
  • Concha
  • Correction
  • Helix
  • Prominent ear
  • Scoring

ASJC Scopus subject areas

  • Oral Surgery
  • Otorhinolaryngology
  • Surgery
  • Medicine(all)

Cite this

Effective scoring of scapha prevents helix irregularity in prominent ear correction - A biomechanical study. / Nagasao, Tomohisa; Miyamoto, Junpei; Shimizu, Yusuke; Kasai, Shogo; Kishi, Kazuo; Kaneko, Tsuyoshi.

In: Journal of Cranio-Maxillofacial Surgery, Vol. 42, No. 6, 2014, p. 711-717.

Research output: Contribution to journalArticle

Nagasao, Tomohisa ; Miyamoto, Junpei ; Shimizu, Yusuke ; Kasai, Shogo ; Kishi, Kazuo ; Kaneko, Tsuyoshi. / Effective scoring of scapha prevents helix irregularity in prominent ear correction - A biomechanical study. In: Journal of Cranio-Maxillofacial Surgery. 2014 ; Vol. 42, No. 6. pp. 711-717.
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abstract = "Background: As the antihelix is created in the operation for prominent ear, the helix often presents irregularities. This biomechanical study aims to elucidate effective techniques to prevent these irregularities. Methods: Finite element models were produced simulating 10 prominent ears. The scaphas of the 10 models were thinned to simulate scoring or abrasion of the cartilage. The thinning was conducted in four fashions. In the first group, no thinning was conducted (Non-Scoring Models); in the second group, the upper half of the scapha was thinned (Upper-Scoring Models); in the third group, the lower half of the scapha was thinned (Lower-Scoring Models); in the fourth group, the whole scapha was thinned (Whole-Scoring Models). Mattress sutures were applied to create the antihelix to simulate Mustarde's in-suture technique. Thereafter, transformation of the helix's contour was evaluated. Results: Irregularity developed on the upper region of the helix with Non-Scoring and Lower-Scoring Models; the degree of the upper-region's irregularity was reduced with Upper-Scoring Models and Whole-Scoring Models. Although the edge of the helix moved in the posterior-medial direction with other type models, it moved in the anterior direction with Whole-Scoring Models. Conclusion: Irregularity of the upper region of the helix can be prevented by performing scoring or abrasion of the upper part of the scapha. The prominence of the helix and width of the auricle are adjustable by varying the areas of the scapha receiving scoring or abrasion. These findings are useful in improving operative outcomes in the treatment of prominent ears.",
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AU - Kishi, Kazuo

AU - Kaneko, Tsuyoshi

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N2 - Background: As the antihelix is created in the operation for prominent ear, the helix often presents irregularities. This biomechanical study aims to elucidate effective techniques to prevent these irregularities. Methods: Finite element models were produced simulating 10 prominent ears. The scaphas of the 10 models were thinned to simulate scoring or abrasion of the cartilage. The thinning was conducted in four fashions. In the first group, no thinning was conducted (Non-Scoring Models); in the second group, the upper half of the scapha was thinned (Upper-Scoring Models); in the third group, the lower half of the scapha was thinned (Lower-Scoring Models); in the fourth group, the whole scapha was thinned (Whole-Scoring Models). Mattress sutures were applied to create the antihelix to simulate Mustarde's in-suture technique. Thereafter, transformation of the helix's contour was evaluated. Results: Irregularity developed on the upper region of the helix with Non-Scoring and Lower-Scoring Models; the degree of the upper-region's irregularity was reduced with Upper-Scoring Models and Whole-Scoring Models. Although the edge of the helix moved in the posterior-medial direction with other type models, it moved in the anterior direction with Whole-Scoring Models. Conclusion: Irregularity of the upper region of the helix can be prevented by performing scoring or abrasion of the upper part of the scapha. The prominence of the helix and width of the auricle are adjustable by varying the areas of the scapha receiving scoring or abrasion. These findings are useful in improving operative outcomes in the treatment of prominent ears.

AB - Background: As the antihelix is created in the operation for prominent ear, the helix often presents irregularities. This biomechanical study aims to elucidate effective techniques to prevent these irregularities. Methods: Finite element models were produced simulating 10 prominent ears. The scaphas of the 10 models were thinned to simulate scoring or abrasion of the cartilage. The thinning was conducted in four fashions. In the first group, no thinning was conducted (Non-Scoring Models); in the second group, the upper half of the scapha was thinned (Upper-Scoring Models); in the third group, the lower half of the scapha was thinned (Lower-Scoring Models); in the fourth group, the whole scapha was thinned (Whole-Scoring Models). Mattress sutures were applied to create the antihelix to simulate Mustarde's in-suture technique. Thereafter, transformation of the helix's contour was evaluated. Results: Irregularity developed on the upper region of the helix with Non-Scoring and Lower-Scoring Models; the degree of the upper-region's irregularity was reduced with Upper-Scoring Models and Whole-Scoring Models. Although the edge of the helix moved in the posterior-medial direction with other type models, it moved in the anterior direction with Whole-Scoring Models. Conclusion: Irregularity of the upper region of the helix can be prevented by performing scoring or abrasion of the upper part of the scapha. The prominence of the helix and width of the auricle are adjustable by varying the areas of the scapha receiving scoring or abrasion. These findings are useful in improving operative outcomes in the treatment of prominent ears.

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