<qa>  What is the aim of this split mouth controlled study?The aim of this split mouth, single-center, controlled study is to compare the healing of intrabony defects treated with a combination of Anorganic Bovine Bone Mineral ABBMPlatelet Rich Fibrin PRF or Anorganic Bovine Bone Mineral alone. The hypothesis being tested in the study was that PRF would augment the regenerative effects of ABBM in human intrabony defects. 