411 RDS

This course is the final operative course. It aims at reinforcement of the previous knowledge gained in the early operative dentistry courses and update of the students with newly developed restorative materials. The clinical sessions are directed towards the clinical application of the principles of operative dentistry by performing different kinds of cavity preparation and restoration. In addition, the students will be introduced to various treatment modalities in the area of esthetic dentistry in the anterior and posterior teeth


exam questions


1- The remaining dentinal thickness (RDT) is:


The remaining dentin from the depth of the cavity preparation to the pulp.


 


2- The most important factor in protecting the pulp from insults


 


a- Isolation.


b- The remaining dentinal thickness.


c- The use of water coolant during cutting.


d- The proper use of insulating material.


 


3- Cavity sealers may:


 


a- Reduce microleakage


b- Protect from chemical irritation


c- Protect from electrical current


d- All of the above


 


4- The only insulating materials that we are sure to provide thermal insulation is


 


a- Cavity sealers


b- Cavity liners


c- Cavity bases


d- All of the above


 


5- Calcium hydroxide assess in reparative dentin formation due to


 


1- Antibacterial action                                                     


2- Alkalinity                                                                      


3- Availability of calcium and hydroxyl ions                   


 


6- The drawbacks of Calcium Hydroxide include:


 


1- Porosity


2- Poor physical properties


3- Acid dissolution with acid etching


4- Degradation under leaky restorations


5- Inability to provide a permanent seal against bacterial invasion


 


7- Glass ionomer cement advantages include:


 


1- High strength and stiffness


2- Leachable fluoride and antibacterial action


3- Good solubility characteristics


4- Adhesive potential


5- Pulpal compatibility


6- Used as a liner, base, and luting


 


8- Advantages of Resin modified GIC when compared to conventional GIC include:


1- Improved physical properties


2- Less moisture sensitivity


 


9- The most obvious disadvantage of ZOE cement as a base under amalgam is that


 It takes long time to harden to be able to withstand amalgam condensation forces


 


10- Write a short note explaining the mixing procedure of Zinc Phosphate cement


 


- 3-6 drops with some powder mixed on a cool glass slab used


- First, small amount of powder is added to neutralize the acid (30 sec)


- Larger quantities added using a rotary motion on a large area


- Spatulate for 15 sec. after adding each increment


- Finish mixing in 90 sec


- A strand of cement extend ½ - ¾ inch from spatula to glass slab to indicate proper consistency for luting purposes


 


11- Cements that chemically bond to tooth structure include


 


a- Zinc Oxide Eugenol Cement                               T          F


b- Polycarboxylate Cement                                     T          F


c- Zinc Phosphate Cement                                     T          F


d- Glass Ionomer Cement                                       T          F


12- Polycarboxylate Cement is pulpally compatible because of


 


a- weak acid


b- Large molecules of acid


c- All of the above


d- Non of the above


 


13- Explain in details the type of pulp protection used in shallow depth cavities, given the rationale for your answer


 


RDT > 2mm


 


DO WE NEED?


Pulp medication Þ No


Chemical protection Þ No


Sealing Þ Yes


Thermal insulation Þ No


Electrical insulation Þ Yes


Mechanical protection Þ No


Þ Sealer only used


14- Explain in details the type of pulp protection used in moderate depth cavities, given the rationale for your answer


 


2mm > RDT > 1mm


 


DO WE NEED?


Pulp medication  Þ ?


Chemical protection Þ Yes


Sealing Þ Yes


Thermal insulation Þ No


Electrical insulation Þ Yes


Mechanical protection Þ No


Þ  A Sealer and Liner are used


 


15- Explain in details the type of pulp protection used in deep cavities, given the rationale for your answer


 


RDT < 1mm


 


 DO WE NEED?


Pulp medication Þ Yes


Chemical protection Þ Yes


Sealing Þ Yes


Thermal insulation Þ Yes


Electrical insulation Þ Yes


Dentin replacement Þ Yes


Þ  Sealer, Liner, and Base are used


 


16-Failure of protecting the pulp can result in:


 


a) Postoperative sensitivity and pain


b) Irreversible pulpitis


c) Recurrent caries


d) Pulp necrosis Þ Periapical pathosis


e) All of the above


 


17- Aged pulps with increased fibrosis have less favorable prognosis for pulp capping


 


                                                                                                        T          F


 


18- We can add a very small amount of liquid after mixing to adjust the consistency of cements when the consistency is too thick


                                                                                                        T          F


 


 

Course Materials