title: Effect of framework soldering on the deformation of implant abutments after framework seating: a study with strain gauges.
abstract: BACKGROUND
  Passive fit has been considered an important requirement for the longevity of implant-supported prostheses. Among the different steps of prostheses construction, casting is a feature that can influence the precision of fit and consequently the uniformity of possible deformation among abutments upon the framework connection.
  
  
  OBJECTIVE
  This study aimed at evaluating the deformation of abutments after the connection of frameworks either cast in one piece or after soldering.
  
  
  METHODS
  A master model was used to simulate a human mandible with 5 implants. Ten frameworks were fabricated on cast models and divided into 2 groups. Strain gauges were attached to the mesial and distal sides of the abutments to capture their deformation after the framework's screw retentions were tightened to the abutments.
  
  
  RESULTS
  The mean values of deformation were submitted to a 3-way analysis of variance that revealed significant differences between procedures and the abutment side. The results showed that none of the frameworks presented a complete passive fit.
  
  
  CONCLUSIONS
  The soldering procedure led to a better although uneven distribution of compression strains on the abutments.
authors: Uninga School of Dentistry, Teresina, Brazil.
authors: Stella de N C
authors: Sde N
authors: Mendes
authors: Carlos E
authors: CE
authors: Edwards Rezende
authors: Rafael T
authors: RT
authors: Moretti Neto
authors: Edson A
authors: EA
authors: Capello Sousa
authors: José
authors: J
authors: Henrique Rubo
mesh_terms: D000044:Dental Abutments; D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D018772:Dental Marginal Adaptation; D019094:Dental Prosthesis, Implant-Supported; D012994:Dental Soldering / Q000379:methods*; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D010165:Palladium / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013499:Surface Properties; D019415:Torque
chemical_list: D003722:Dental Alloys; D015921:Dental Implants; D012834:Silver; D010165:Palladium