exam questions 411RDS

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