Comparison between two different technique of applying fissure sealant on permenant molar teeth

the Rationale of the experiment arm are: -Finding on the use of (self-etch adhesives) which is the experiment arm is still inconclusive and further clinical trials are needed. -There is no published clinical study employing a self-etch mode of universal adhesive agent for the placement of fissure sealants. -With the elimination of the acid etching (rinsing and drying) steps (in the control arm), the need for fewer operative steps and shorter chair time is particularly interesting when treating paediatric patients In the experiment arm, I will use dental material (not a drug) already in the market globally for more than 5 years (Single Bond Universal Adhesive Scotchbond™) as etching material in a self-etch way but the difference is that I will test the effectiveness of what the producer claims it's effective. According to manufacturer instruction, the etching material will be raped on the tooth surface for 20 sec then blow with air and use the light cure. All applications and examinations will be conducted by a single operator which is a dentist. The self-etching material will be placed on the targeted molar just before the fissure sealant. According to the pilot study we performed 5min is the estimated time for each tooth. After curing the sealant will be checked for voids using an explorer. The occlusion will be checked with articulation paper The school children will be examined in their school as part of the local preventive program then the potential subject will be given participate sheet and consent form. Then after that appointments will be arranged to apply the fissure sealant with a different technique in dental faculty um in optimal situations then participants will be reviewed in 6 and 12 months later Randomization between techniques will be achieved by computer-generated randomization