Effect of different types of magnification lenses on muscular activity during performing preclinical procedures

• Grant number: 19/25528-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2020
• End date: May 31, 2023
• Field of knowledge: Health Sciences - Dentistry - Social and Preventive Dentistry
• Principal Investigator: Patrícia Petromilli Nordi Sasso Garcia
• Grantee: Ana Flávia Ribeiro Monteiro Fernandes
• Host Institution: Faculdade de Odontologia (FOAr). Universidade Estadual Paulista (UNESP). Campus de Araraquara. Araraquara , SP, Brazil

Abstract

This study aims to observe the effect of different magnification systems loupes on the muscular activity of the upper dorsum and neck muscles under simulated clinical conditions. For this, a laboratory experimental study will be carry out, where the dependent variable will be the muscular activity of muscular activity of the upper dorsum (descending trapezius and ascending trapezius) and neck (sternocleidomatoid) and the independent variable is the magnification system on 4 levels (direct view; loupe monocular, loupe with Galilean system; loupe with Keplerian system). The loupe monocular will be BioArt, 3.5 increase, loupe with Galilean system will be the binocular kity beauty of UNIVET®, 3.5 increase. For the Keplerian system will be used loupe UNIVET®, 4.0 increase. Class I cavity preparations for composite resin will be performing with a spherical cutter diamond #1012 at low speed on the teeth 16, 26, 36 and 46. Dental phantom head with artificial resin teeth, specific to the cavity preparation in pre-clinical level, will be used. The Dental phantom will be attached to the dental chair to simulate treatment in a clinical setting. The evaluation of muscle activity will occur by surface electromyography of the muscles of the upper dorsum (descending trapezius and ascending trapezius) and neck (sternocleidomatoid). Descriptive statistical analysis will be performed. After checking the normality assumptions and homoscedasticity will be performed analysis of variance (ANOVA) with one factor and Tukey post-test. Data analysis will be conducted independently for the 4 different teeth. The significance level will be 5%.