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

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Abstract

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.

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Authors and Affiliations

  1. Department of Paediatric Dentistry, Medical Center for Dentistry, University Medical Center Giessen and Marburg, Campus Giessen, Schlangenzahl 14, D-35392, Giessen, Germany

    N. Krämer & H. Rudolph

  2. College of Dentistry, University of Tennessee, 875 Union Avenue, Memphis, TN, 38163, USA

    F. Garcia-Godoy

  3. The Forsythe Institute, Boston, MA, USA

    F. Garcia-Godoy

  4. Department of Operative Dentistry and Endodontics, Medical Center for Dentistry, University Medical Center Giessen and Marburg, Campus Marburg, Georg-Voigt-Str. 3, D-35039, Marburg, Germany

    R. Frankenberger

Authors
  1. N. Krämer
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  2. H. Rudolph
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  3. F. Garcia-Godoy
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  4. R. Frankenberger
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Correspondence to R. Frankenberger.

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Krämer, N., Rudolph, H., Garcia-Godoy, F. et al. Effect of thermo-mechanical loading on marginal quality and wear of primary molar crowns. Eur Arch Paediatr Dent 13, 185–190 (2012). https://doi.org/10.1007/BF03262868

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