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Related Concept Videos

Teeth01:15

Teeth

The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
Tooth Anatomy01:21

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
Veneer01:19

Veneer

Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...

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Related Experiment Video

Updated: Jul 17, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Preformed metal crowns for decayed primary molar teeth.

N P T Innes1, D N J Ricketts, D J P Evans

  • 1Dundee Dental School, Unit of Dental and Oral Health, Park Place, Dundee, Tayside, UK, DD1 4HN. n.p.innes@dundee.ac.uk

The Cochrane Database of Systematic Reviews
|January 27, 2007
PubMed
Summary

No randomized controlled trials were found comparing preformed metal crowns (PMCs) to fillings for primary molar teeth. Further research is needed to confirm PMC effectiveness in pediatric dentistry.

Related Experiment Videos

Last Updated: Jul 17, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

Area of Science:

  • Pediatric Dentistry
  • Restorative Dentistry
  • Evidence-Based Dentistry

Background:

  • Preformed metal crowns (PMCs) are recommended by the British Society of Paediatric Dentistry (BSPD) for restoring severely decayed primary molars.
  • Despite recommendations, dental practitioners show low adoption rates due to perceived cost and clinical difficulty.
  • Existing literature lacks robust evidence supporting the durability of PMCs over traditional filling materials.

Purpose of the Study:

  • To systematically review and compare the clinical outcomes of primary molar teeth restored with PMCs versus those restored with filling materials.
  • To identify and evaluate randomized controlled trials (RCTs) assessing the effectiveness of PMCs in pediatric restorative dentistry.

Main Methods:

  • A comprehensive literature search was conducted across multiple databases (Cochrane CENTRAL, MEDLINE, EMBASE, SIGLE) up to August 2005.
  • Randomized controlled trials (RCTs) comparing PMCs with filling materials or no treatment in children with decayed primary molars were included.
  • Study selection and data extraction were performed independently by multiple reviewers to ensure rigor.

Main Results:

  • The search yielded 47 records, with 14 studies scrutinized. However, no studies met the inclusion criteria for RCTs.
  • Six studies were excluded due to retrospective design or lack of randomization.
  • Consequently, no data were available for analysis, preventing any conclusions on the comparative success of PMCs versus filling materials.

Conclusions:

  • The current evidence base lacks high-quality randomized controlled trials to support the widespread recommendation of PMCs by the BSPD.
  • While case reports and uncontrolled studies suggest favorable outcomes for PMCs, rigorous research is essential.
  • There is a critical need for prospective RCTs to definitively compare the efficacy and durability of PMCs against filling materials for decayed primary molars.