The aim of this study is to evaluate and compare the effect of lower lingual holding arch space maintainer versus removable partial denture space maintainer on some salivary parameters (salivary flow rate, pH, viscosity and buffering capacity).
This study is a randomized clinical trial, it will be conducted on forty children, aged from (7-10) years, who are in need for space maintainer. * Children will be randomly and equally divided into two groups according to type of space maintainer used; group (1): twenty children with lower lingual holding arch, group (2): twenty children with removable partial denture. * Un-stimulated and stimulated saliva will be collected at specific duration of time from children before the delivery of the appliance and after 1, 3 and 6 months of wearing the space maintainer to measure salivary flow rate, pH, viscosity and buffering capacity.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
40
lower lingual holding arch space maintainer is an orthodontic device which connects two molars lower dental arch. it has an archwire, adapted to the lingual side of the lower anterior teeth, that soldered to the bands on first permanent molar
Removable Partial Denture consists of a pink or gum-colored plastic base to which the new, artificial, replacement teeth are attached to. a metal framework holds the denture in place inside the mouth
Faculty of medicine, Suez Canal University
Ismailia, Egypt
Assessment of salivary flow of un-stimulated saliva
Un-stimulated whole saliva will be collected from all individuals by direct expectoration into a sterile container over a period of 10 min by spitting method, so that the flow rate could be calculated by dividing the amount of expectorated saliva by 10 min
Time frame: before delivery of appliance, after 1 month, 3 months, 6 months
Assessment of salivary flow of stimulated saliva
To stimulate saliva, the subjects will be asked to chew a piece of paraffin wax, and saliva will be collected for 5 min in a measuring cup with 1ml gradation marks; the stimulated salivary flow rate (ml/min) will be calculated by dividing the amount of expectorated saliva by 5 min
Time frame: before delivery of appliance, after 1 month, 3 months, 6 months
Assessment of Salivary pH
Salivary pH will be measured using an electronic pH meter
Time frame: before delivery of appliance, after 1 month, 3 months, 6 months
Assessment of viscosity of saliva
Salivary viscosity will be determined by allowing saliva to flow through a tube of circular cross section to measure the flow rate . This will be done using the Ostwald viscometer.
Time frame: before delivery of appliance, after 1 month, 3 months, 6 months
Assessment of buffering capacity
By estimating the pH change after HCl titration into un-stimulated saliva for a buffering capacity test.
Time frame: before delivery of appliance, after 1 month, 3 months, 6 months
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