Vol 2 Q1

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1. CPD Questions – CAD&RP fabrication of Removable Partial Denture Frameworks.

Question 1.1:

Removable partial denture manufacturing employing Computer aided design and rapid prototyping has the following advantages;

A. Faster design time than using wax-up techniques.

B. Higher quality due to the fact the quality assurance can be build into the design.

C. Better fit since scaling factors can be used to compensate for shrinkage in casting.

D. All of the above.

E. A and C

Question 1.2:

The software used allows the operator to turn the object on the screen to view it from any angle, and also give the sensation of working on a physical model.  This is due to:

A. The virtual ‘clay’

B. The haptic interface

C. A ‘buck’ setting

D. All of the above

E. None of the above.

Question 1.3:

The outcome of this study has revealed the following about Stereolithography:

A. There has not been a significant difference in the finished product between the       standard and high-resolution layers used for building up the framework

B. Proved to be more suitable for manufacturing PDF because it was more stable, and thus more accurate

C. 3D wax printing of the framework was simpler and faster than Stereolithography.

D. All of the above

E. None of the above.

Question 1.4:

The success in designing a partial denture framework using Polyworks software in this study was mainly due to the

integration of ‘buck’ model and ‘clay’ model for the design of the clasps and the bulk of the framework.

A. True

B. False

Question 1.5:

According to this study, higher quality RDF will be possible when:

A. Appropriate intra-oral scanning technology can be used instead of scanning of the plaster model

B. Rapid prototyping in thinner layers than the high-resolution (0.0625mm) can be achieved

C. Rapid prototyping can eliminate the sacrificial pattern and build parts directly in metal alloys

D. All of the above

E. A and C

2. CPD Questions – Using CAD/CAM Technology for the full-mouth, fixed, retrievable implant restoration.

Question 2.1:

Which of the following factors will improve the fit of an implant supported, full mouth, fixed restoration?

A. An open-tray impression technique using low-shrinkage, self-cure acrylic to secure the implant position.

B. The use of collagen membrane during the surgical placement of the implants

C. The use of titanium framework milled from a solid piece of titanium using CAD/CAM technology.

D. All of the above

E. A and C

Question 2.2:

As more edentulous patients chooses implant retained prosthesis, retievability is one of the most important aspects to keep in mind when doing the treatment plan.  In the maxilla, retievability through conventional screw retention might be compromised due to:

A. the need for long-term maintenance of the prostheses.

B. the angulation of the implant placement.

C. restoring the opposing arches in the same patient

D. All of the above

E. A and C

Question 2.3:

The final prosthesis in the case of the 67-year-old woman discussed in the article, were manufactured using:

A. the “tissue-integrated prosthesis” technique

B. cemented restorations due to the gag reaction of the patient

C. Metal ceramic restorations with custom made lingual retainer screw holes

D. All of the above

E. A and B

Question 2.4:

The atrophic maxilla in the patient presented the dental team with several problems in terms of the use of conventional methods of framework fabrication, some of which were:

A. The excessive size and weight of the metal framework

B. Distortion of the impression materials and gypsum products

C. Thermal expansion and repeated porcelain firings complicating the fit of the framework

D. All of the above

E. A and C

Question 2.5:

The titanium substructure of the fixed retrievable implant supported restoration was manufactured through:

A. CAM

B. CAD

C. CAD/CAM

D. All of the above

E. None of the above

3. Questions – Anterior dental aesthetic: Dental perspective.

Question 3.1:

Various factors influence the shape of the anterior sextant, like the genetic factors, age, sex, personality and a few others.  Which of the following statement can be marked true regarding the shape of the anterior sextant?

A. The width of a anterior tooth is more important than the length.

B. The width of the maxillary central is can be determined by dividing the width of the face by 16.

C. The width of the maxillary central according to some studies can be taken as equal to the width of the iris.

D. All of the above.

E. B and C  

Question 3.2:

Factors that increase dental age can be described as;

A. The decrease of the inciso-gingival measurements in the anterior sextant

B. An increase in translucency translating to a lack of lustre in the enamel

C. A smoother surface texture

D. All of the above

E. A and C 

Question 3.3:

What would be the criteria for over-contouring of a crown if the bucco-lingual thickness is measured at the point where the middle third and incisal third of the tooth crosses?

A. When the measurement is less than 2mm

B. When the measurement is more than 3.5mm

C. When the measurement varies between 2.5mm and 3.3 mm

D. When the measurement is more than 0.618 that equates to the Golden Proportion

E. None of the above

Question 3.4:

Balance and harmony is paramount in gaining aesthetic approval in the composition of anterior dental aesthetics.

This can be achieved in practice by:

A. The use of exact size and ratio

B. Achieving similar, repeated proportions

C. Ensuring that the left and right sides of the maxillary sextant should look the same.

D. All of the above

E. B and C

Question 3.5:

In an ideal situation the relationship between maxillary and mandibular anteriors in terms of length can be described as follows:

A. Maxillary anteriors should be 12mm, mandibular anteriors 10mm, overbite, 4mm and the vertical dimension between gingival zeniths 18mm.

B. Maxillary anteriors should be 18mm, mandibular anteriors 12mm, overbite, 2mm and the vertical dimension between gingival zeniths 20mm.

C. Maxillary anteriors should be 10mm, mandibular anteriors 8mm, overbite, 2mm and the vertical dimension between gingival zeniths 12mm

D. Maxillary anteriors should be 18mm, mandibular anteriors 12mm, overbite, 4mm and the vertical dimension between gingival zeniths 20mm

4. Questions – A review of dental CAD/CAM

Question 4.1:

The father of dental CAD/CAM systems was Dr Moermann, the developer of the CEREC® system.  His chairside CAD/CAM system that provided same-day dentistry was the start of digital dentistry in the early 1980’s.

A. True

B. False

Question 4.2:

The marginal integrity of chairside CAD/CAM has been dissatisfactory initially but were deemed expectable when used in conjunction with:

A. the improved ceramic block.

B. the upgraded software.

C. adhesive composite luting cements.

D. All of the above

E. None of the above

Question 4.3:

According to the article, which is the most used material in CAD/CAM for manufacturing of fixed partial dentures?

A. lithium disilicate (Empress II®)

B. glassinfiltrated alumina (InCeram Alumina®)

C. glassinfiltrated alumina with partially stabilized zirconia (In-Ceram Zirconia®)

D. densely sintered alumina (Procera®)

E. Yttria-stabilized tetragonal zirconia polycrystals (Cercon®, Lava®)

Question 4.4:

In vitro studies showed the primary cause of failure reported for all-ceramic bridges opposed to metal supported bridges are:

A. inferior marginal integrity.

B. the lack of quality control in CAD/CAM systems

C. fracturing in the connector areas because of concentrated stress

D. All of the above

E. None of the above

Question 4.5:

Areas for development of CAD/CAM systems includes:

A. increased structural design analyses during the design process

B. the decrease of internal defects of milled products

C. the analysis of multiple-axis mandible movements for recovering funtion

D. All of the above

E. A and C

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