The Correlation between Joint Sound Versus Temporomandibular Opening Index (TOI) on Cases of Maxillary and Mandibular Teeth Loss

Abstract

Temporomandibular disorder (TMD) is a condition that affects adjacent masticatory or temporomandibular
joints (TMJ) including the entire tissue. Evaluation for TMD includes lateral jaw movement, protrusion
and maximum mouth opening. Dysharmony in one or more of that evaluation can be a TMD indicator. The
aim of study was to understand the correlation between joint sound against Temporomandibular Opening
Index (TOI) on cases of maxillary and mandibular teeth loss.Subjects were taken from Yogyakarta province.
There were 40 subjects was divided to be four groups include 10 lost two quadrants of posterior teeth for
18 months, 10 lost one quadrant of posterior teeth for 18 months, 10 lost two quadrants of posterior teeth
for 12 months and 10 lost one quadrant of posterior teeth for 12 months. Mouth opening were measured
by active and passive means followed by inserting into a formula to acquire TOI. The temporomandibular
joint sound wasobserved by special prototype of electrosonography and processed withMatlab software
to acquire the data. The joint sound was carried out on both sides. The data were analysedby SPSS 16.0
program using regression testto obtain the correlation between TOI and joint sound. The level of significant
was set at ?=0.05.Results revealedmeans of TOI on all groups showed significant differences of positive
correlation between frequency and amplitude of joint sound (p<0.05). In conclusion, joint sound has a
positive correlation with TOI in cases of maxillary and mandibular tooth loss.