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Pre-clinical training: effect of fingers rest position on muscular hand activity during the conduct of cavity preparations

Grant number: 19/09972-1
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2019
Effective date (End): July 31, 2022
Field of knowledge:Health Sciences - Dentistry - Social and Preventive Dentistry
Principal researcher:Patrícia Petromilli Nordi Sasso Garcia
Grantee:Mariana Segnini Tiberti
Home Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil


The present study aims to observe the effect of different forms of fingers rest suport during pre-clinical cavity preparation on the hand muscular load. For this, an experimental laboratory study will be carried out. The dependent variable will be the muscular load of the working hand used during the execution of simulated clinical procedures (cavity preparation). The independent variable will be the form of fingers rest position during the preparation of the cavity (without fingers rest position, with fingers rest position following the recommendations of the Discipline of Ergonomics in Dentistry of the Faculty of Dentistry of Araraquara and with spontaneous fingers rest position. Cavity preparations will be performed on the teeth 16, 26, 36 and 46. The diamond spherical cutter 1014 will be used in low rotation. A dental mannequin that has artificial teeth in resin, specific for pre-clinical cavity preparation, will be used. The manikin will be attached to the dental chair to simulate treatment in a clinical setting. The individual will be instructed to hold the micro-motor with three fingers and use the three types of finger rest position for the preparation of cavity preparations and the order of these firgers rest position will be randomized. The operator can rest 5 minutes between each procedure. The muscular activity will be evaluated by the surface electromyography of the extrinsic muscles of the hands that experience high load during micromotor and contra-angle seizure: superficial flexor of the fingers, long flexor of the thumb, long flexor of the common extensor of the fingers and short radial extensor of the carpal. Descriptive statistical analysis will be performed. After verifying the normality and homoscedasticity assumptions, two-way ANOVA and Tukey's post-test will be performed. The level of significance adopted will be 5%.

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