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A laboratory study to determine the effects of universal and rotating ultrasonic inserts on wrist movement and scaling time efficiency of dental hygienists
Author(s) -
Hawn CC,
Tolle SL,
Darby M,
Walker M
Publication year - 2006
Publication title -
international journal of dental hygiene
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.674
H-Index - 38
eISSN - 1601-5037
pISSN - 1601-5029
DOI - 10.1111/j.1601-5037.2006.00163.x
Subject(s) - wrist , ultrasonic sensor , standard deviation , scaling , insert (composites) , medicine , mathematics , orthodontics , statistics , geometry , materials science , surgery , composite material , radiology
Purpose: The purpose of this study was to determine if differences existed in range of wrist movements and scaling time efficiency of dental hygienists using a rotating ultrasonic insert when compared with a standard universal insert. Methods: A convenience sample of 32 consenting experienced dental hygienists who met inclusion criteria was invited to participate. Using a cross‐over research design, the 32 participants were randomly assigned to one of the two subgroups. Subgroup A ( n = 16) used the rotating universal ultrasonic insert on a typodont, rested for 15 min and the standard universal insert on a different typodont. Subgroup B ( n = 16) used the standard universal ultrasonic insert on a typodont, rested for 15 min and the rotating universal ultrasonic insert on a different typodont. Each participant used the rotating and standard universal ultrasonic scaling inserts to remove 2 cm 3 artificial calculus from two different typodonts for up to 15 min per insert. Scaling time efficiency was determined using a Modified Volpe–Manhold Calculus Index, measuring the amount of artificial calculus remaining after ultrasonic scaling. While scaling, each participant wore the WristSensor TM goniometry gloves, which determined changes in wrist movements (flexion and extension and ulnar and radial deviations), measured as a deviation from the neutral position. Results: A paired t ‐test ( P = 0.05) using 30 subjects with useable data, revealed no statistically significant differences between the two different inserts in terms of wrist movements and scaling time efficiency . A multivariate analysis of variance revealed no statistically significant differences in the percentage of time dental hygienists were in high, medium or low‐risk posture categories while using the rotating ultrasonic insert compared with the standard universal insert. Based on the results of this laboratory study, dental hygienists using a rotating ultrasonic insert appear to experience no ergonomic advantage in terms of wrist postures or timesavings over a standard insert.