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Main Idea

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manar mohsen

on 7 April 2014

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Transcript of Main Idea

Smart Bur (Polymer Bur)

GV Black Cavity Preparation principles :
Extension for prevention
Retention form
Convenience form

Paper (1)
Polymer Burs

A “plastic” bur was made of a polyamide/imide (PAI) polymer, possessing slightly lower mechanical properties than sound dentin.
if the bur touches sound or caries-affected dentin, it quickly becomes dull and produces undesirable vibration, making further cutting impossible.
Local anesthesia
hardness of the polymeric material will efficiency of the polymer bur
SmartBurs, SSWhite Burs
At the beginning of the past century, the term “
” was defined as a synonym for “
cavity preparation
”, which means “
mechanical treatment of
the injuries to the teeth produced by dental caries, as
would best fit the remaining part of the tooth to receive a filling
until a hard pulpal floor was reached
Appearance of adhesive restorative filling materials

Minimal Invasive Dentistry

What is the current definition of the caries removal endpoint?

Cris Dentinaire

(Penning Ch. et al, 2007)

Caries excavation
Air Abrasion
Laser Excavation
Carbon Steel and Tungsten Carbide burs
Ceramic burs
Polymer burs
Paper(1): Methods
Paper (1): Methods
Criteria for caries activity were:
visible cavity and soft or leathery cavity surface on gentle probing. Teeth were evaluated via periapical radiographs for the presence of pathology, and bitewing radiographs were used to assess the depth of caries penetration towards the pulp.
One of the primary molars was prepared with a Smartbur, and the other one was prepared with a carbide bur.
Paper(1): Methods
Paper(1): Methods
Paper(1): Methods
(1) Obtaining the first sample from carious dentin prior to use of either type bur (2) obtaining the second sample from the surface remaining following removal of caries-infected dentin
Microbiological Procedures
Group (1) Smartburs
Group (2) Carbide Bur
TYCSB agar
(tryptone, yeast extract, cystine,
sucrouse and bactricine
)... "Strept Mutans"
Rogosa agar
... "Lactobacilli"

... "Anaerobic bacteria"
Blood agar
... "Aerobic bacteria"
Paper (1): Results
Paper(1): Conclusion
Based on this study’s results, the following conclusions can be made:
1. Total bacterial counts were reduced with carious dentin preparation by first generation polymer burs; the Smartbur was found to be microbiologically as effective as the conventional carbide bur at removing infected carious dentin.
2. The Smartbur can be used as an efficient, selective removal instrument for infected carious dentin while preserving the harder, caries-affected dentin.
Paper(1): Discussion
Paper (2)
Paper(2): Methods
Specimen preparation:
Thirty extracted permanent molars with caries were employed. They were immediately stored at 4 C in 0.1% thymol solution for less than 3 months.
The teeth had their roots embedded in a mould of acrylic resin and were then bisected through the centre of the carious lesion. The teeth were separated into two different experimental groups of 15 teeth each.
Conventional Round Carbide Bur
Group 1
Polymer Bur SmartBurs II
Group 2
Paper(2): Methods
. Digital Imaging and Analysis
Fig: Experimental set-up used for digital imaging
Fig: Schematic representation of image analysis
Paper(2): Methods
. Performance Assessment of Caries Removal Procedures

1) Caries-removal effectiveness (CRE):
- Relative residual carious-affected dentine (RA/IA ratio)
- Relative residual carious-infected dentine (RI/II ratio)
- Total relative residual dentine [(RA+RI)/(IA+II)]
2) Minimal-invasive potential (MIP):
- Infected dentine relative cavity (PC/II ratio)
- Total relative cavity size [PC/(II+IA) ratio)
- Corrected relative cavity size [(PC-RS)/(IA+II)]
Paper(2): Discussion
Paper(2): Conclusion
Based on this study’s results, the following conclusions can be made:

Paper (2): Results
(1) Obtaining the first sample from carious dentin prior to use of either type bur (2) obtaining the second sample from the surface remaining following removal of caries-infected dentin
Paper (1): Aim of The Study
Twenty-four 5- to 9-year-old patients (16 boys, 8 girls) with 2 active carious lesions on the occlusal surfaces of primary molars.
Paper (2): Aim of The Study
Assess the performance of carbide and polymer burs in the dentine
caries removal effectiveness
minimal invasive potential
, employing digital image analysis
CRE: the polymer bur obtained the highest preservation of carious affected dentine after excavation, when (RA/IA) parameter was assessed. The CRE was not significantly different between both types of burs when (RI/II ratio) and (RI + RA/II + IA ratio) were measured.
Regarding the evaluation of (MIP): (PC/II) was higher when the carbide bur was used, resulting in the worst compromise between effective and selective infected-caries removal. The MIP was not significantly different when (PC/II + IA ratio) and (PC - RS/II + IA ratio) were evaluated after comparing both types of bur.
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