title: Objective validity of an implant-retained overdenture with a ball attachment system after marginal mandibulectomy.
abstract: Implant-retained overdentures are known to improve oral function, but the clinical impact on patients who have had mandibular resections is still debatable. We have treated 16 patients who had such resections for oral cancer and consequent loss of the alveolar ridge, with overdentures supported by osseointegrated implants and ball attachments. To quantify their functional improvement, we evaluated their maximum bite force and masticatory performance. Their function improved significantly, (from 77.5N - 365N, 371% increase in maximum bite force, p<0.001) and masticatory performance increased (from 2.5 - 7.7, 208%, p<0.0001) after the overdentures had been inserted. While individual changes in maximum bite force showed no significant correlation, those in masticatory performance correlated significantly, which suggests that the subjects with poor masticatory function are likely to benefit from retention of an implant. These results indicate that implant-retained overdentures are an effective way to rehabilitate patients after marginal mandibular resection.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204. Electronic address: ryuichi@m.ehime-u.ac.jp.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Murase
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204.
authors.forename: Akiko
authors.initials: A
authors.lastname: Ishikawa
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kyushu University Graduate School of Medicine, 3-1-1, HigashikuMaidashi, Fukuoka city, Fukuoka, Japan 812-8582.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Sumida
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204.
authors.forename: Kozue
authors.initials: K
authors.lastname: Shinohara
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204.
authors.forename: Koh-ichi
authors.initials: K
authors.lastname: Nakashiro
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ehime University Graduate School of Medicine (Chief: Prof. HAMAKAWA Hiroyuki), 454 shitsukawa, Toon city, Ehime, Japan 791-0204.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Hamakawa
mesh_terms: D001732:Bite Force; D019094:Dental Prosthesis, Implant-Supported; D003781:Denture Retention; D003828:Denture, Overlay; D006801:Humans; D008334:Mandible / Q000601:surgery*; D019647:Oral Surgical Procedures; D017060:Patient Satisfaction
keywords: Implant-retained overdentures; Masticatory performance; Maximum bite force