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

N. Krämer, H. Rudolph, Franklin Garcia-Godoy, R. Frankenberger

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 5-55oC 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 x200 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.

Original languageEnglish (US)
Pages (from-to)185-190
Number of pages6
JournalEuropean Archives of Paediatric Dentistry
Volume13
Issue number4
DOIs
StatePublished - Jan 1 2012

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Crowns
Composite Resins
Metals
Tooth Attrition
Dental Cementum
Mastication
Dentin
Orthodontics
Tooth
Lasers
Hot Temperature

All Science Journal Classification (ASJC) codes

  • Pediatrics, Perinatology, and Child Health
  • Dentistry (miscellaneous)

Cite this

Effect of thermo-mechanical loading on marginal quality and wear of primary molar crowns. / Krämer, N.; Rudolph, H.; Garcia-Godoy, Franklin; Frankenberger, R.

In: European Archives of Paediatric Dentistry, Vol. 13, No. 4, 01.01.2012, p. 185-190.

Research output: Contribution to journalArticle

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