European Archives of Paediatric Dentistry

, Volume 13, Issue 4, pp 185–190 | Cite as

Effect of thermo-mechanical loading on marginal quality and wear of primary molar crowns

  • N. Krämer
  • H. Rudolph
  • F. Garcia-Godoy
  • R. FrankenbergerEmail author
Scientific Article


AIM: To evaluate the effect of thermo-mechanical loading (TML) on marginal quality and wear of different crown types for primary molars. METHODS: Eighty extracted human primary molars were used. After preparation, five groups received different crowns (n=16): preformed metal crowns (3M ESPE) and NuSmile crowns (Orthodontic Technologies Inc.) were inserted as preformed metal crowns; as semi-preformed crowns Protemp crowns (3M ESPE) were luted; and as individually manufactured resin composite crowns Filtek Z250 (3M ESPE) and Heliomolar (Ivoclar Vivadent) were used. Specimens were subjected to 2,500 thermal cycles between 5–55°C and chewing simulation for 100,000 cycles at 50N at a frequency of 0.5 Hz. Before and after thermo-mechanical loading, impressions of the teeth were taken and replicas were made. The replicas received marginal quality evaluation under a SEM at ×200 magnification. Occlusal wear was measured as vertical height loss using a 3-D laser scanning microscope. RESULTS: After TML, all crowns were intact. The adhesively bonded crowns showed significantly better marginal quality to dentine/cementum compared with GIC luted crowns (p<0.05). Laboratory made crowns showed a good fit and nearly transition-free margins also after TML. Preformed metal crowns showed the significantly lowest wear rates compared to the resin composites (p<0.05). Among the resin composite groups, Protemp exhibited the most pronounced wear depths (p<0.05). CONCLUSIONS: The different crown types under investigation showed a good performance concerning the evaluated parameters marginal quality and wear.

Key words

Primary molars chewing simulation preformed metal crowns resin composites 


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Copyright information

© European Archives of Paediatric Dentistry 2012

Authors and Affiliations

  • N. Krämer
    • 1
  • H. Rudolph
    • 1
  • F. Garcia-Godoy
    • 2
    • 3
  • R. Frankenberger
    • 4
    Email author
  1. 1.Department of Paediatric Dentistry, Medical Center for DentistryUniversity Medical Center Giessen and Marburg, Campus GiessenGiessenGermany
  2. 2.College of DentistryUniversity of TennesseeMemphisUSA
  3. 3.The Forsythe InstituteBostonUSA
  4. 4.Department of Operative Dentistry and Endodontics, Medical Center for DentistryUniversity Medical Center Giessen and Marburg, Campus MarburgMarburgGermany

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