Mount and Hume Tooth Preparation Classification

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Questions and Answers

In the Mount and Hume classification, which of the following is NOT a consideration for determining the 'SIZE' of a tooth preparation?

  • The presence of a white spot
  • The presence of a cusp tip or incisal edge involvement
  • The extent of dentin involvement
  • The need for restoration (correct)

According to the Mount and Hume classification, a tooth preparation with a Size 1 designation would indicate:

  • A large cavity that requires significant restoration
  • A small cavity with only enamel involvement
  • A small cavity with minimal dentin involvement where remineralization is no longer possible (correct)
  • A small cavity with minimal dentin involvement and remineralization is still possible

A proximal tooth preparation in the Mount and Hume classification would fall under which SITE category?

  • Both Site 1 and Site 2
  • Site 2 (correct)
  • Site 1
  • Site 3

In the Mount and Hume classification, a tooth preparation located on the cervical third/root surface would be classified under which SITE?

<p>Site 3 (C)</p> Signup and view all the answers

What is a distinguishing feature of the Mount and Hume classification compared to the Black's classification of tooth preparation?

<p>It specifically emphasizes the use of adhesive dentistry (D)</p> Signup and view all the answers

In the Mount and Hume classification, which site and size combination would describe a tooth preparation with extensive tooth loss and involving the incisal edge?

<p>Site: 2 ; Size: 4 (B)</p> Signup and view all the answers

According to the Mount and Hume classification, what size designation would be used for a tooth preparation involving only the incisal edge or cusp tip with minimal loss of tooth structure?

<p>Size 0 (B)</p> Signup and view all the answers

Which of the following statements accurately describes the ICDAS system?

<p>ICDAS employs a two-number coding system for each surface, with one number representing the caries code and the other representing the restoration code. (D)</p> Signup and view all the answers

What distinguishes ICDAS from earlier classifications like Mount and Hume?

<p>ICDAS is a more comprehensive system, catering to clinical practice, education, research, and public health, unlike the more limited Mount and Hume. (A)</p> Signup and view all the answers

The ICDAS system is used in which of the following settings?

<p>In various settings, including clinical practice, education, research, and public health. (C)</p> Signup and view all the answers

Which class of tooth preparation involves the proximal surface of posterior teeth and is characterized by involvement of the incisal edge?

<p>Class IV (D)</p> Signup and view all the answers

According to the content, what is the main reason for the need for a newer classification of tooth preparation?

<p>The existing classification does not account for the fact that caries classification and cavity design should be considered separately. (D)</p> Signup and view all the answers

Which class of tooth preparation describes a cavity located on the cervical third of anterior or posterior teeth?

<p>Class V (B)</p> Signup and view all the answers

Which of the following statements accurately reflects the newer classification system for tooth preparation as suggested by the content?

<p>The newer classification recognizes the need to consider caries classification and cavity design separately, rather than as linked entities. (B)</p> Signup and view all the answers

Which of the following accurately describes the location of a Class I tooth preparation?

<p>Occlusal or pit and fissure surfaces of both anterior and posterior teeth (A)</p> Signup and view all the answers

Which of the following is NOT a reason for surgical intervention in a tooth?

<p>To correct a cosmetic issue (C)</p> Signup and view all the answers

What is the term used to describe the junction of two or more walls of a tooth preparation?

<p>Line angle (D)</p> Signup and view all the answers

Which of the following is NOT a surface of a tooth preparation?

<p>Incisal (B)</p> Signup and view all the answers

What is the main purpose of the "extension for prevention" concept in tooth preparation?

<p>Ensure the restoration is big enough to prevent future decay (B)</p> Signup and view all the answers

Which of the following is NOT a wall of a tooth preparation?

<p>Proximal (C)</p> Signup and view all the answers

What is the significance of Greene Vardiman Black's contribution to dentistry?

<p>He developed a classification system for cavities (C)</p> Signup and view all the answers

Which of these is NOT a dental plane?

<p>Buccal (A)</p> Signup and view all the answers

Which of the following is NOT a line angle?

<p>Buccal (C)</p> Signup and view all the answers

What is the primary purpose of a point angle?

<p>To provide a smooth transition between walls (A)</p> Signup and view all the answers

Flashcards

Cavity Preparation

Process of preparing a tooth for restoration by removing decay.

Walls of Tooth Preparation

Prepared surfaces of the tooth that are involved in cavity preparation.

Line Angle

Angle formed by the junction of two walls in a tooth preparation.

Point Angle

The convergence point of three walls or planes in tooth preparation.

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Black's Classification

A guideline for classifying tooth preparations based on cavity form, created by G.V. Black.

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Mesial

Surface of the tooth facing the midline of the dental arch.

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Distal

Surface of the tooth farthest from the midline of the dental arch.

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Buccal

The surface of the tooth that is adjacent to the cheeks.

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Lingual

The surface of the tooth that faces the tongue.

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Occlusal

The chewing surface of the back teeth.

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Class I Tooth Preparation

Cavity located in the occlusal or pit and fissures of teeth.

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Class II Tooth Preparation

Cavity located on the proximal surface of posterior teeth.

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Class III Tooth Preparation

Cavity located on the proximal surface of anterior teeth.

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Class IV Tooth Preparation

Cavity on the proximal surface of anterior teeth with incisal edge involvement.

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Class V Tooth Preparation

Cavity located in the cervical third of both anterior and posterior teeth.

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Mount and Hume Classification

A classification method for tooth preparation based on site and size, developed in 1997.

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Site 1 - Occlusal

Refers to preparations on the chewing surfaces of teeth, including pits and fissures.

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Size 0 Caries

First stage of caries characterized by a white spot, indicating early demineralization.

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Size 1 Caries

Minimal cavitation with dentin involvement; remineralization is no longer possible.

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Size 2 Caries

Moderate dentin involvement, but remaining tooth structure can still support fillings.

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ICDAS

International Caries Detection and Assessment System for tooth conditions.

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mICDAS

Modified version of ICDAS for local adaptations.

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Caries Coding

A coding system used in ICDAS that includes caries and restoration codes.

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Size Classification

Categorization of tooth preparation based on size, from 0 to 4.

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Study Notes

Principles of Cavity Preparation I

  • Learning objectives include describing tooth preparation terminology, identifying tooth preparation walls and angles, and classifying lesions and tooth preparations.
  • Not all pathological dental lesions require surgical intervention. If surgical intervention is needed, the goal is to limit damage and restore tooth function. This may involve restoring form, function, and aesthetics.

Nomenclature

  • Anatomical planes include transverse, frontal, and sagittal.
  • Dental terms are mesial, distal, buccal/labial, lingual/palatal, occlusal.
  • Walls are prepared surfaces of tooth preparation.
  • Angles are junctions of two or more walls. Line angles are formed by two walls. Point angles are the convergence of three walls/planes.

Walls

  • Illustrations show different walls (e.g., buccal, distal, lingual) on the prepared tooth.

Angles

  • Line and point angles are depicted on a diagram to show the relationships between walls. Different types of line angles are shown.

Classification of Tooth Preparation

  • Black's Classification (1908):
    • Father of modern dentistry.
    • Extension for prevention.
    • Classification linked to cavity form.
    • Still widely used today.
  • Extension for prevention - is it still relevant?
    • Better adherence properties of modern restorative materials.
    • More appropriate (long term) methods of retention.

Classification of Tooth Preparation - Mount and Hume (1997)

  • Relatively new classification.
  • Based on site and size.
  • Records actual state of caries activity/stage.
  • Considers preventive strategies and adhesive dentistry in the classification.
  • Monitoring is possible.
  • Determine size (0-4), with specific descriptive characteristics for each size.

Classification of Tooth Preparation - Mount and Hume (1997) continued

  • There are tables listing different site areas (pit/fissures, contact areas, cervical third/root surface).
  • Each site has different sizes from 0 to 4
  • Images demonstrate various caries sizes on teeth.

International Caries Detection and Assessment System (ICDAS) (2002)

  • New classification system developed in 2002.
  • Regarded as better categorization system for clinicians, educators, researchers, and public health.
  • Adopted in many countries, including Malaysia (with FGG)
  • Some use it as modified ICDAS (mICDAS). An example is KKM.
  • Uses a 2-number coding system for each tooth surface.
  • ICDAS scores ranging from 0-6 are defined, representing different degrees of caries and restoration.
  • More detail will likely be available in a separate lecture about ICDAS.

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L6 Principles of Cavity Preparation 1 PDF

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