title: Comparative evaluation of impact strength of fragment bonded teeth and intact teeth: an in vitro study.
abstract: BACKGROUND
  To test and compare the impact strength of fragment bonded teeth with that of intact teeth by using impact testing machine (pendulum type) as a mode of load.
  
  
  METHODS
  Forty extracted, maxillary, central incisors selected for this study (20 control group and 20 experimental group). In experimental group, teeth crowns were fractured with a microtome at 2.5 mm from mesioincisal angle cervically, fractured portion is attached to original crown portion with 3 M single bond dentin bonding agent and 3 M Z '100', composite resin. Impact strength of fragment bonded teeth and intact teeth tested with impact testing machine and compared.
  
  
  RESULTS
  Mean impact strength of fragment bonded teeth (30.76 KJ/M(2) ) is not statistically significant deferent from mean impact strength of intact teeth (31.11 KJ/M(2) ).
  
  
  CONCLUSIONS
  Mean impact strength of fragment bonded teeth is not statistically different with that of intact teeth. Hence, after fracture of teeth if it is restored with fragment reattachment by using 3 M single bond dentin bonding agent and 3 M Z '100' composite resin is having impact strength like that of intact teeth. How to cite the article: Venugopal L, Lakshmi MN, Babu DA, Kiran VR. Comparative evaluation of impact strength of fragment bonded teeth and intact teeth: An in vitro study. J Int Oral Health 2014;6(3):73-6.
authors.affiliation: Department of Dentistry, Rajiv Gandhi Institute of Medical Sciences, Srikakulam, Andhra Pradesh; India.
authors.forename: L
authors.initials: L
authors.lastname: Venugopal
authors.affiliation: Department of Orthodontics, Government Dental College, Hyderabad, Andhra Pradesh, India.
authors.forename: M Narasimha
authors.initials: MN
authors.lastname: Lakshmi
authors.affiliation: Department of Orthodontics, Gitam Dental College, Visakhapatnam, Andhra Pradesh, India.
authors.forename: Devatha Ashok
authors.initials: DA
authors.lastname: Babu
authors.affiliation: Department of Prosthodontics, Siddhartha Institute of Dental Sciences, Gannavaram, Vijayawada, Andhra Pradesh, India.
authors.forename: V Ravi
authors.initials: VR
authors.lastname: Kiran
keywords: Composite resins; dentin bonding; impact strength; reattachment; teeth fracture
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