1resin bonded bridge

Question 1

rbb

resin bonded bridge

Answer 1

fixed prosthesis replace a missign tooth in a smmal edentulous area .its mainly invasive to tooth structure adn uses composite resin cement for retention

invasive:مجتاحه

Question 2

waht does the rbb reproduce?

Answer 2

1 morphology of the portions prepared tooth
2 maintain its functon
3prevent future damageof remains tooth

Question 3

what is the main advatage of rbb?

Answer 3

minimal tooth preperation

Question 4

what are the types of rbb?

Answer 4

1 rochette
2 maryland
3 cast mesh FPD
4 virginia bridge

virgina bridge disadvantages like rochette + salt crystals

Question 5

what is the first type of RBB ?

Answer 5

rochette bridge

Question 6

what is the bonding way in 1rochette bridge?

Answer 6

1 perforatons in the abutment wings metal retainers create macro-mechanical retention
2 used compisite cement along side with 3 saline coping agent

Question 7

what is that create adhesion in the 1rochette bridge?

Answer 7

saline couping agent

Question 8

the failures in 1rochette bridge :

Answer 8

1due to no preperations- bulky lingualcompisite tends to wear
2abutment wing perforated causes weakness
3 exposure to wearof resin at the perforated
4 lach of adhesion lead to de-bonding

Question 9

what comes to solve the rochette brideg failure ?

Answer 9

Maryland Bridge
-using micromechanical retention
- alter the surface of metal retainers and abutment preparation

Question 10

whats new in the 2maryland bridge?

Answer 10

1 proximal and lingual and occlusal rest
2 ceramics pontic
3 sandblasted metal wing
4 more bontic higher debonding
5 should be done on none mobile abutment teeth
6 proven success rate 80% at 15 years
7 no perforations
metal parts are chemicalley etched

Question 11

with what is sandblasted metal

Answer 11

alumina oxide particles 250mm al2o3

Question 12

3 cast mesh rbb

Answer 12

1 non etched after casting
2 mesh like lingusle surface with macro-mechanical retention

Question 13

ADVantages of RBB

Answer 13

1 minimal prep
2 high strength alloy
3 simple pontic and two wing
4easy to recement whe debonding
5 cheaper than implant and 3unit bridge
*its can be cleaned out and rebonded

Question 14

DISadvantages of RBB

Answer 14

1 sensitive preperaton
2 sensitive cementaton technique
3 no occluson forc should be present
4 discoloration of abutment teeth

Question 15

=anterion tooth preperation of RBB

Answer 15

1 lingual proximal axial into facial surface to provide faciolingual lock
3 proximal and cingulum groove
*4 keep .5 mm occlusal reduction to prevent exposure of tooth pulp

Question 16

=posterior tooth preperation of RBB

Answer 16

1occlusal rest
2 retintive surface with enough occlusal reduction
3 proximal wrap and slots to resist lateral forces
4 generally in molars and pre covers a lingual cusp

Question 17

why using th eocclusal rest?

Answer 17

1 resist gingival displacement
2 biting forces distribution
3place in proximal marginal areas to the edentulous space placed in oppisate side

Question 18

what s the case in the premolars and molars?

Answer 18

1occlusial rest with exceptions in the maxillary
2 molars and premolars have lingual cusp coverage
3 mandibular full covarge cusp

Question 19

2 light chamfer finish line

Answer 19

1mm supragingivally

Question 20

RBB VS conventional bridge work

Answer 20

RBB higher failure rates but convetional involves bacterial penetraton through margins this lead to rct or loose of the tooth

penetraton اختراق

Question 21

intraoral placement of RBB

Answer 21

1 cleanedabutment tooth
2 isolated area nad abutment is air DRIED
3acid tched enamel phosphoric acid
4 acid etched are rensed thoroughly
5resin is applied followed by composite resin

Question 22

what we use in direct intraoral RBB?

Answer 22

selfcuring acrylic of composite material

Question 23

with what we altered the surface of the metal rochette bridge in the maryland?

Answer 23

by sandblasting with aluminum oxide particles 250mm al2o3

Question 24

why RBB is less tragic than conventional bridges despite the fact that failure rates of RBB is higher?

Answer 24

because conventional bridges failure involves bacterial penetration through margins

Question 25

with what we acid etched the enamel in RBB?

Answer 25

phosphoric acid 30-50%