Background
tissue loss, bone loss, tooth
CLOT, IMPACTED MOLARS, BONE LOSS, SECONDARY, IMPACTED TEETH
A serious condition that can arise after the surgical extraction of an impacted lower third molar (3M) is the deterioration of the periodontal status of the adjacent second molar (2M). This condition can take a chronic course that affects the long-term stability and survival of the 2M. A controversial but predominant opinion is that bone loss may occur on the 2M’s distal aspect. In such cases, the 2M’s cementum can be exposed, and the condition may even require tooth extraction [Many researchers have focused on factors such as flap design [Healing type has been suggested to periodontal status of the 2Ms. With regards to partially erupted impacted molars, primary intention healing is only possible with a sliding flap, which would be difficult compared to fully impacted teeth without tissue loss. In these situations, primary wound healing can be supported with various materials [Absorbable materials have some benefits, including enhancing primary wound coverage and promoting wound healing through isolation, clot and wound stabilization and haemostasis [This study intended to evaluate the following hypothesis: Is the administration of collagen membrane after surgical removal of partially erupted impacted 3Ms effective on periodontal healing? This study compared primary and secondary healing and collagen-membrane-based primary healing after surgical removal of partially erupted impacted 3Ms, evaluating the distal alveolar bone level (ABL) and periodontal status of the adjacent 2Ms. Short-term results of this study were presented in a previous manuscript.