Effects of different oral rehabilitations in masticatory muscles
Objectives: Dental absence interferes in the physiological functioning of the masticatory system, promoting occlusal and functional alterations. The purpose of this study was to verify electromyography (EMG) activity and ultrasonographic thickness of masticatory muscles and maximal molar bite force in 32 individuals with different oral rehabilitation, divided in four groups: GI – osseointegrated implants with single crowns, GII – upper complete denture and lower two-implant-supported overdentures, GIII – upper and lower complete denture and GIV – control individuals.
Methods: EMG Myosytem Br1 was used to analyze the masseter and temporal muscles in rest, opening and closing mouth, right and left laterality, protrusion, habitual chewing and maximum voluntary contraction. Sono Site ultrasound with linear transducer (L38, 5-10MHz; 38mm) was used to obtain the masseter and temporal muscles thickness in clinical condition of rest and during maximum voluntary contraction and a digital dynamometer model IDDK (Kratos) was used to measure the maximal bite force in the first molar regions (right and left).
Results: Statistical analysis (ANOVA - SPSS program) was performed with the normalized data by maximum voluntary contraction and the EMG results showed statistical significance during rest maintenance, opening and closing mouth, right and left laterality, protrusion, (p<0.05). The ultrasonographic thickness data presented no statistical significance. The values of maximal bite force in the first molar regions were statistically significant among the analyzed groups (p<0.01). Control and osseointegrated implants with single crowns groups presented the higher values on both sides.
Conclusion: These data evidence the strong influence of different types of oral rehabilitation in the electromyographic activity and maximal bite force.
Grants: FAPESP n. 2008/51409-8
Division: British Division Meeting
Meeting:2009 British Division Meeting (Glasglow, Scotland) Location: Glasglow, Scotland
Year: 2009 Final Presentation ID:68 Abstract Category|Abstract Category(s):Scientific Groups
Authors
Botrel-rosa, Laner
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Siessere, Selma
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Semprini, Marisa
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Silva, Ronaldo José
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Bersani, Edmilson
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Sousa, Luiz Gustavo
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Hallak, Jaime Eduardo Cecilio
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)
Regalo, Simone Cecilio Hallak
( School of Dentistry of Ribeirao Preto, University of Sao Paulo, Ribeirao Preto, N/A, Brazil
)