Injection molding
Following the placement of the bonding agent, a small amount of heated flowable resin composite (Polofil NHT flow Voco, Germany) at 70 °C in dental resin composite heater (The Active Resin (AR) Heat, China) was carefully injected into both teeth to fill this critical cervical area to act as flowable resin composite reservoir, followed by the injection of heated Paste resin composite (universal Nano-Hybrid composite Grandio Voco, Germany). The snowplow technique or the injection moulding technique are the terms used to describe this procedure. A paste composite was then injected from the facial into the previously placed flowable composite reservoir, displacing as much of the flowable composite as possible into the palatal area.Excess palatal material was removed prior to the curing device usage (B-Cure Woodpecker Co., Ltd, Guilin Guangxi, China). It was used to cure all three resin components (bonding resin, flowable composite, and paste composite) at the same time. The light-curing units’ tip was held perpendicular to the tooth surface at zero distance to ensure optimal curing. A radiometer was then used to measure the intensity of the curing light before and after it was applied to each participant, ensuring that the light output was never less than 1200 Mw/cm2. The marginal interface was sculpted and polished with utmost caution to avoid over-finishing.