title: Perforation risks associated with the use of Masserann endodontic kit drills in mandibular molars.
abstract: OBJECTIVE
  The use of Masserann kit is a frequently recommended technique for the removal of canal obstructions. Although this technique is usually successful, it may cause excessive removal of dentin tissue in root canals. The aim of this study is to evaluate the perforation risk and the remaining dentin thickness in mesial canals of mandibular molars following the use of Masserann kit.
  
  
  METHODS
  Fifty-three extracted human mandibular molars were selected for the study. The teeth were separated into 3 groups based on the degree of curvature of the root canals. By using Radio Visio Graphy and Coral Draw 8.0 software packages, the dentin/cement thickness of root canal was measured before and after the use of Masseran kit drills.
  
  
  RESULTS
  In the severely and moderately curved mesial root of mandibular molars, the Masserann Kit increased the risk of creating thin or perforated walls. Additionally, after 7.5mm depth of drilling, the percentage of perforations increased in all groups.
  
  
  CONCLUSIONS
  With respect to endangering the dentinal walls towards the apex of root canals, Masserann kit drills were found to increase the risk of perforations in curved canals and in deep preparations.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Faculty of Dentistry, University of Cukurova, Balcali Adana, Turkey. oguzyoldas@cu.edu.tr
authors.forename: Oguz
authors.initials: O
authors.lastname: Yoldas
authors.forename: Haluk
authors.initials: H
authors.lastname: Oztunc
authors.forename: Cemal
authors.initials: C
authors.lastname: Tinaz
authors.forename: Nazan
authors.initials: N
authors.lastname: Alparslan
mesh_terms: D016009:Chi-Square Distribution; D003738:Dental Cements / Q000737:chemistry; D003786:Dental Pulp Cavity / Q000293:injuries*; D003804:Dentin / Q000473:pathology; D004867:Equipment Design; D006801:Humans; D008334:Mandible; D008963:Molar / Q000293:injuries*; D009811:Odontometry / Q000379:methods; D019252:Radiography, Dental, Digital; D012307:Risk Factors; D018915:Root Canal Preparation / Q000009:adverse effects / Q000295:instrumentation*; D012984:Software; D019227:Tooth Apex / Q000473:pathology
chemical_list: D003738:Dental Cements