Sternotomy Closure,Open Heart Surgery

The goal of this clinical trial is to learn if a new medical device (SC03 plates) to close the sternum after a sternotomy in patients that have been operated of a cardiac surgery, is safe and effective. The main question it aims to answer is: Do patients that have the sternum closed with the SC03 plates present a stable sternum one month after surgery? Researchers will compare the SC03 plates with stainless steel wires (current standard of care to close the sternum). Participants will: * be implanted with the SC03 or stainless steel wires. * visit the clinic one month and six months after surgery * Keep a diary of their symptoms and analgesia use

Sternotomy scars, which are localized in a high-tension area are often dystrophic, hypertrophic or keloidal, and can be difficult to accept to patients who already endured a heavy intervention with high psychologic impact. The investigators wish to evaluate immediate post-surgical injection of botulinum toxin to improve scar aspect and impact. A randomized, placebo-controlled, split-scar clinical trial will determine the improvement of scar aspects assessed by standardized scores (SBSES, POSAS), patient satisfaction and tolerance.