INTRODUCTION CASE REPORT H emisection refers to sectioning of a mandibular molar into two halves followed by removal of the diseased root and its coronal portion. The retained root is endodontically treated and the furcation area is made self-cleansable by removing the lip of root carefully. Since hemisected teeth fail by root fractures, it is important to restore them adequately by an extra-coronal restoration. It is indicated where one of the root of molar is unsalvageable due to caries, periodontitis or iatrogenic mishaps It is thus a conservative option with acceptable prognosis. It has other indications aswell. In orthodontics management of congenitally missing mandibular second premolar is simplified by hemisectioning the retained deciduous second molar and closing the space in stages. It has been used to facilitate the eruption of impacted second premolar. Similarly primary molar hemisection has been suggested to aid in the management of ectopically erupted permanent first molar. Load bearing capacity of these teeth has also been investigated and with adequate restoration, they have near normal functioning capacity in in-vitro. Published literature has demonstrated an adequate prognosis for hemisected teeth. The presented case report is about hemisection of a mandibular first molar. A 35-year old married lady was referred to the OPD of Operative Dentistry/Endodontics at Baqai Dental College. She had a complaint of pain in her left lower quadrant since last two weeks. She was also worried about the presence of a small tooth-like, unusual growth in the same quadrant. History revealed that a year ago, she got root canal treatment done in left mandibular first molar tooth # 36 followed by an extra coronal restoration. Her medical history was non contributory. Extra- oral examination did not show any abnormality. Intra-orally, all the teeth were present except # 46 which was extracted due to caries. Oral hygiene was very poor and significant amount of plaque and calculus were present. Tooth # 36 was tender on percussion and a peculiar root fragment was visible in the buccal sulcus (Fig. 1). 1 2 3 4 5-7 8 9 10,11 12-14 . * Lecturer, Dept. of Operative Dentistry / Endodontics, Baqai Dental College, Baqai Medical University, Karachi, Pakistan ** Professor, Dept. of Operative Dentistry / Endodontics, Baqai Dental College, Baqai Medical University, Karachi, Pakistan *** House Surgeon, Dept. Of Operative Dentistry / Endodontics, Baqai Dental College, Baqai Medical University, Karachi, Pakistan Correspondence: Khalid Shafiq, <dr_mkhalid@hotmail.com > This is a case report of a lady who was worried about the presence of a small tooth like structure in the area adjacent to root treated left mandibular first molar. Intra-oral X-ray showed that it was an apically fractured part of the mesial root of the molar lodged in the buccal sulcus. The tooth was hemisected and mesial root was removed along with the dislodged part. Athree unit bridge combining the hemisected root and adjacent second premolar was inserted which is successfully in service for more than a year. Hemisection, Dislodge root, Mandibular Molar. KEYWORDS: HEMISECTION: AN OPTION TO TREAT APICALLY FRACTURED & DISLODGED PART OF A MESIAL ROOT OF A MOLAR Mohammad Khalid Shafiq* Asaad Javaid SaadiaAsaad *** BDS ** BDS, MCPS, MDS BDS CASE REPORT 183 JPDA Vol. 20 No. 03 July-Sep 2011