Evaluation of composite restorations done in carious cervical lesions restored by a conventional universal adhesive in comparison to a universal adhesive that contains and resistant silane coupling agent according to the Modified United States Public Health Service (USPHS) criteria over 18 months.
The presence of acidic monomers in the bottle during storage can lead to the hydrolysis of silane contained in universal adhesives, potentially reducing its effectiveness and causing instability,The acid resistant silane coupling agent has a protective structure against attacks from acidic monomers. Therefore, long-term storage stability can be expected by suppressing hydrolysis. The protective structure is removed when the concentration of acidic monomers increases by air drying after application. This activates ARS, exerting the silane coupling effect.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
80
After cavity preparations, enamel margins will be etched for 30 seconds then rinsed and dried, then the Universal adhesive without acid resistant silane coupling agent will be actively applied for 20 seconds then air thinned for 5 seconds then cured for 20 seconds.Then the composite restoration will be placed.
After cavity preparations, enamel margins will be etched for 30 seconds then rinsed and dried, then the Universal adhesive which contains acid resistant silane coupling agent will be actively applied for 20 seconds then air thinned for 5 seconds then cured for 20 seconds.Then the composite restoration will be placed.
Cairo University
Cairo, Egypt
Retention (Success rate)
Alpha (A) Present Bravo (B) Partial loss but clinically acceptable Charlie (C)Clinically unacceptable partial loss or absent
Time frame: T0=baseline 24 hours postoperative. T1=12 months postoperative. T2=18 months postoperative.
Marginal adaptation
Alpha (A) Restoration adapts closely to the tooth structure; there is no visible crevice. Bravo (B) There is a visible crevice, the explorer will penetrate, without dentin exposure. Charlie(C)The explorer penetrates into a crevice in which dentin or the base is exposed.
Time frame: T0=baseline 24 hours postoperative. T1=12 months postoperative. T2=18 months postoperative.
Marginal discoloration
Alpha (A) No marginal discoloration. Bravo (B) Minor marginal discoloration without staining toward the pulp, only visible using a mirror and operating light. Charlie(C) Deep discoloration with staining toward the pulp, visible at a speaking distance of 60 to 100 cm.
Time frame: T0=baseline 24 hours postoperative. T1=12 months postoperative. T2=18 months postoperative.
Secondary caries
Alpha (A) No active caries present Charlie(C) Active caries is present in contact with the restoration
Time frame: T0=baseline 24 hours postoperative. T1=12 months postoperative. T2=18 months postoperative.
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