The influence of single molar crown placement on the smoothness of masticatory movement

T. Watamoto, T. Mizumori, H. Egusa, K. Yashiro, K. Takada, H. Yatani

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The jerk-cost is an index that can quantify the smoothness of various movements including human body movements. A previous study reported the usefulness of jerk-cost in the evaluation of masticatory movement, and proposed that the masticatory movement of subjects with good occlusion could be explained as a maximum smooth movement. The purpose of this study was to investigate the influence of a single prosthetic molar restoration on the smoothness of masticatory movement. Fourteen adults who visited this hospital seeking a single prosthetic restoration on a molar were selected. Each subject chewed a piece of chewing gum on the molars of the treated side before and after crown placement. Movement trajectory was recorded using the Sirognathograph Analyzing System. Normalized jerk-cost (NJC) was calculated on the closing phase of each chewing cycle and was compared before and after the crown placement. After the prosthetic restoration, NJC significantly decreased (P < 0.05) in seven subjects with a crown placed on a lower molar, whereas significant changes were not observed in seven subjects with a crown placed on an upper molar. These results suggest that restoring a crown on a lower molar could significantly improve the smoothness of masticatory movement on the same side.

Original languageEnglish
Pages (from-to)440-445
Number of pages6
JournalJournal of oral rehabilitation
Volume35
Issue number6
DOIs
Publication statusPublished - 2008 Jun
Externally publishedYes

Keywords

  • Jaw movement
  • Jerk-cost
  • Mastication
  • Movement physiology
  • Single crown

ASJC Scopus subject areas

  • Dentistry(all)

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