ي جماعه نحتاج اسنان
من يعطينا وله دعوة
@Dentistooobot

هولا اللي فوق اسئله الكوزات تبع د / ظافر دنتل ماتريل
ل جامعه تعز .

Seminar 3 dental material:
group B:
*Evening

Q1: Put T or F and correct the false answer?

1- Natural teeth should be opposed in wear (F)
(should not be✅)

2 - The Rochwell test application in brittle material (F)
(viscoelastic materials✅)

3 - Psedoplastic fluids the viscosity decrease with increase shear rate (T)

Q2 : Mention the factors effecting hardness ?

Answer:
1- strength
2- P.L
3- ductility
4- malleability

Seminar2 - Dental material- group A evening

*Q1 : T or F

1- The energy required to stress ( the point of fracture should go only under elastic portion) is resilience. (F)

2- The restoration fillings should be in elastic portion to avoid temporary deformation. (F)

3- The brittle material has a fracture point at or near the proportional limit. ( T)

Q2 : Explain why impression material should be elastic?

Seminar 2 dental material:
group B:
*Evening

Q1: T or F

1-fracuture of ductility material ocuur at or
near PL ( F )
(Fracture of brittleness✅)

2-proof stress is point where the material started shown elastic behavior ( F )
(Shown plastic behavior✅)

3-tow forces applied on material in same straight line away from each other in compressive stress ( F )
(in tensile stress✅)

Q2 : What important the ultimate strength or yield strength... Why..???

●yield strength because determined the permanent deformation...

*Seminar 1 Dental material
Morning *

Q1 :Explain advantages and disadvantages of high density in densitry?

Q2 : T and F : -

1- يجب ان لا نعمل material base عند عمل حشوه معدنية لحماية البلب بتكون الاجابه (خطأ)

2- ضروري نعمل مواد الفرونيسيس لأسنان البورسلين الإجابه بتكون (صح) اي تعويض سواء كانت حشوه او سن صناعي لازم مادة الفلوريسنس عشان تعطي قليل لمعان كالسن الطبيعية.

Seminar 2 dental material:
Group B:
*Morning

Q1: T or F

1- Ductility is elastic deformation (F)
(plastic deformation✅)

2- Under proportional limit is elastic and plastic deformation (F)
(elastic deformation✅)

3- Ductility is ability of a material to be drawn under compression (F)
(under tension✅)

Q2 : What is the difference between resilience and toughness?

السؤال الثاني المطلوب تعاريفهم و المهم : انه الresilience تكون بجهه elastic اما toughness تكون elastic&plastic up to fracture

Seminar 2 dental material:
group C:
*Evening

Q1: Put T or F and correct the false answer?

1- Strain is deformation that happened in the material during internal force and may result in temporary deformation or permanent deformation (F)
(external force✅)

2 - P.L is maximum stress at which the stress equal the strain in plastic portion (F)
(elastic portion✅)

3 - When apply two forces in the same straight line and away from each other , it is called shear sterss (F)
(tensile stress✅)

Q2 : Mention the benefits when adding zirconia to porcelain?

Answer:
1- to increase fracture toughness to inhibite crack propagation.
2- it provides good aesthetics to the patient.