Indonesian Journal of Dentistry 2006; Edisi Khusus KPPIKG XIV: 266-271Traumatic injury of the teeth occurs frequently on anterior and posterior teeth. Pulp necrosis is often the frequent sequel of trauma and it will lead to development of periapical lesion in the presence of pathogenic microorganism. Two cases of periapical lesion reported here were caused by occlusal trauma. It is still controversial whether a case of large periapical lesion should be treated conventionally or surgically. This cases was treated non surgically and it was proved that this kind of treatment could promote large apical healing succesfully.