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why can an ACC not be used for a Class III

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In the 2019 revision lecture, a table shows the 10 year success rate of RBBs is 59%, however a prospective study described in the paper below lists the success rate at 80.4%. Which success rate should we quote? https://fgdpscotland.org.uk/wp-content/uploads/2016/05/Dent_Update_2016_Resin-bonded-bridge-design-.pdf 

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In the 2019 revision lecture, a table shows the 10 year success rate of RBBs is 59%, however a prospective study described in the paper below lists the success rate at 80.4%. Which success rate should we quote? https://fgdpscotland.org.uk/wp-content/uploads/2016/05/Dent_Update_2016_Resin-bonded-bridge-design-.pdf 

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Am I correct in saying that the Dahl approach is used to provide extra vertical space anteriorly, whilst using posterior teeth to maintain the existing occlusal relationship. What would you do if you wanted to change the existing occlusal relationship? 

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Am I correct in saying that the Dahl approach is used to provide extra vertical space anteriorly, whilst using posterior teeth to maintain the existing occlusal relationship. What would you do if you wanted to change the existing occlusal relationship? 

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When would you opt to mount casts in RCP rather than ICP on a semi adjustable articulator? Thank you.

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When would you opt to mount casts in RCP rather than ICP on a semi adjustable articulator? Thank you.

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If you were cementing a crown using a resin adhesive but the resin set before you were able to properly clean away the excess, how would you remove the excess?

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Is a dentine bonded crown based on the same principles as a RBB? As in they help maintain the most tooth structure?

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Is a dentine bonded crown based on the same principles as a RBB? As in they help maintain the most tooth structure?

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Is an ICP record done using a wax record / squash bite?

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Is an ICP record done using a wax record / squash bite?

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Am I right in thinking that Alumina and Zirconia crowns cannot be etched and therefore they require a traditional luting cement, as opposed to a resin adhesive cement?

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Am I right in thinking that Alumina and Zirconia crowns cannot be etched and therefore they require a traditional luting cement, as opposed to a resin adhesive cement?

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What are the indications for sectioning a bridge?

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What are the indications for sectioning a bridge?

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I was struggling to understand where the forces are dissipated in a mesial cantilever bridge which cause flexion, cement fracture and ultimate failure? I know forces dissipate distally, so would the cement fail distally on the retainer? Also, if there was a double abutment mesial cantilever, where would the cement fracture here - between the two abutments or on the more distal abutment? Thank you

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What is the appropriate fixed pros replacement if a patient had both upper central incisors missing? All other teeth in the mouth are sound.

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Not sure if this is a silly question but just wondering with regards to bridge substructures - are the substructures made from the different materials i.e. CoCr, zircona, aluminium oxide, lithium disilicate? And if so, are the values listed for connector thickness how thick their substructure needs to be for fracture resistance? Or do they all have metal substructures which need to vary in connector thickness to support the different ceramic suprastructures? Thank you

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In the fixed pros revision lecture titles Bridge retainers, it says 'avoid heavy load on the pontic (no contact in lateral and protusive)' when talking about fixed cantilever bridges. How would this be achieved, and does this mean an anterior pontic cannot be in anterior guidance?

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I'm a little confused about incisal reductions for veneers - do you always need to reduce the incisal edge by 1.5mm or can you leave it untouched and only reduce the labial surface? Thank you.

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Why does a class 2 div 1 incisal relationship require a face bow record?

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Why does a class 2 div 1 incisal relationship require a face bow record?

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If a tooth is broken down in one area in particular, e.g. a palatal cusp has fractured on a premolar, would you still advocate the use of a 1/2 crown or 3/4 crown, leaving the buccal aspect of the tooth intact/unprepared? Also, I assume a resin cement would therefore have to be used due to lack of retention/resistance form from lack of prep?

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If a tooth is broken down in one area in particular, e.g. a palatal cusp has fractured on a premolar, would you still advocate the use of a 1/2 crown or 3/4 crown, leaving the buccal aspect of the tooth intact/unprepared? Also, I assume a resin cement would therefore have to be used due to lack of retention/resistance form from lack of prep?

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why do you need group function in Class II div 1? do you alter the patient's canine guidance to GF if the patient is class II div 1?

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why do you need group function in Class II div 1? do you alter the patient's canine guidance to GF if the patient is class II div 1?

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Could you please upload the crown lectures that 3rd years were given, thank you.

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Could you please upload the crown lectures that 3rd years were given, thank you.

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Please look in the 5th year revision folder on VITAL. The 3rd year content is also available in your 4th year resources under CCSC.

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What doe PVC stand for in the gold shell crown presentation?

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What doe PVC stand for in the gold shell crown presentation?

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Partial Veneer Crown

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What doe ICD stand for in the onlay presentation?

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What doe ICD stand for in the onlay presentation?

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Intercuspal distance

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What do you use as a temporary restoration for an inlay?

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What do you use as a temporary restoration for an inlay?

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Materials such as Systemp inlay or Telio Inlay.

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If you were to prep an upper incisor for a veneer, what material/method would you use as the temporary veneer? 

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If you were to prep an upper incisor for a veneer, what material/method would you use as the temporary veneer? 

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There may not be need to temporise if the prep is limited to enamel and for the short term. Otherwise temporaries can be constructed in composite (integrity) in a similar method as for temporary crowns and spot etched

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In terms of amount of tooth structure remaining, when is a core build up sufficient and when is a post and core required? 

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In terms of amount of tooth structure remaining, when is a core build up sufficient and when is a post and core required? 

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when providing an indirect restoration, when would it be indicated to not conform to the existing occlusal patterns and existing contacts and vice versa. 

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when providing an indirect restoration, when would it be indicated to not conform to the existing occlusal patterns and existing contacts and vice versa. 

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Can zirconia be used for long span bridges if needed?

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Can zirconia be used for long span bridges if needed?

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Q: Are telescopic retainers alway used for fixed-moveable design?

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Q: Are telescopic retainers alway used for fixed-moveable design?

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Can attrition be attributed to CCP (constricted chewing pattern)?

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Can attrition be attributed to CCP (constricted chewing pattern)?

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In the second restorative test a question asked true or false if length was important when transferring from group function to canine guidance? Could I just get further elaboration on why contour is more important then length in this circumstance considering the primary function of canines in gnathologic system is to direct vertical (rather than a horizontal) mandibular jaw movement? What happens when you do not have adequate interocclusal space between canines where contour can be changed? 

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In the second restorative test a question asked true or false if length was important when transferring from group function to canine guidance? Could I just get further elaboration on why contour is more important then length in this circumstance considering the primary function of canines in gnathologic system is to direct vertical (rather than a horizontal) mandibular jaw movement? What happens when you do not have adequate interocclusal space between canines where contour can be changed? 

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What is the best option for replacement of a 6 where the 7 is tilted? A cantilver bridge off the 5, a telescopic retainer, a fixed-movable, a proximal minor retainer? And why?  

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What is the best option for replacement of a 6 where the 7 is tilted? A cantilver bridge off the 5, a telescopic retainer, a fixed-movable, a proximal minor retainer? And why?  

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On the 2019 revision lecture one of the slides suggests when in laterotrusive movement (working side) the mediotrusive (non working) side should have no contacts. Surely non working side "CONTACTS" should not be removed. As contacts are not pathological (i.e no wear facets) and are PASSIVE whilst interferences (wear facets present) should be adjusted/re controured/contralateral adjusments made as they are ACTIVE ? Just slightly confused would like your input.

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On the 2019 revision lecture one of the slides suggests when in laterotrusive movement (working side) the mediotrusive (non working) side should have no contacts. Surely non working side "CONTACTS" should not be removed. As contacts are not pathological (i.e no wear facets) and are PASSIVE whilst interferences (wear facets present) should be adjusted/re controured/contralateral adjusments made as they are ACTIVE ? Just slightly confused would like your input.

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After an extraction how long should you wait before placing a bridge?

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what is the maximum thickness of the nickel chromium retainer for a RBB?

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My question is in reference of treatment to indirect restorations. Looking at the literature would it be correct to suggest that indirect composites should be sandblasted over etching,  as the alumina helps in the bonding due to the impregnation of the alumina particles in the composite? if etched exposes weakly held filler particles in the indirect composite leading to a weak bond? 2. Silica based ceramics should be acid etched over sandblasting as it exposes structurally stable silica and adhesive resins should be used? Also with zirconia would you sandblast and utilise panavia V5  due to the MDP content? 

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My question is in reference of treatment to indirect restorations. Looking at the literature would it be correct to suggest that indirect composites should be sandblasted over etching,  as the alumina helps in the bonding due to the impregnation of the alumina particles in the composite? if etched exposes weakly held filler particles in the indirect composite leading to a weak bond? 2. Silica based ceramics should be acid etched over sandblasting as it exposes structurally stable silica and adhesive resins should be used? Also with zirconia would you sandblast and utilise panavia V5  due to the MDP content? 

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Is it always recommended to have a mesial, single abutment for a cantilever bridge or will a distal cantilever still be acceptable? I know that distal cantilevers have a higher failure rate, but if replacing a U3 for example would the U4 provide a better abutment that the U2 as it has a bigger root surface area? Or would it still be more likely to fail as it is a distal abutment? Thanks!

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Can you use a tooth with a post and core as an abutment for a cantilever RBB?

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Can you use a tooth with a post and core as an abutment for a cantilever RBB?

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Does the position of the pontic or abutment dictate whether the cantilever is a mesial or a distal one?
Thanks

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Is a Porcelain Jacket Crown just another name for an ACC, or are they two different things?

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how do you decide over a RBB or fixed-fixed, fixed-cantilever bridge?

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At what complexity level would we refer to a specialist?
Is a GDP able to treat some complexity 2 cases if they felt competent to do so or will they all have to be referred?
Also when referring a complexity 2 case, would that be made to a specialist or could it be made to a GDP with a special interest who has a tier 2 contract?

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when would you choose a custom made post and core over a pre-fabricated post? Also when is a metal post better than a glass fibre post? 

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when would you choose a custom made post and core over a pre-fabricated post? Also when is a metal post better than a glass fibre post? 

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I understand that the properties of self adhesive cements are slightly compromised in comparison to adhesive cements(total etch luting agents). I'm confused as to why self etch cements are not recommended to be used for high strength ceramics and self adhesives are? Referring to table in 2018 Revision Lecture.

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When would you carry out RCT through a crown/bridge in contrast to removing the crown/bridge and then carrying out the RCT?

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How do you decide if occlusion is unfavourable for crown/bridge work and how do you manage this?

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How much axial reduction is required for gold onlays? (is it the same as FGSCs?) 

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How much axial reduction is required for gold onlays? (is it the same as FGSCs?) 

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If an RBB de-bonds, does the metalwork need to be sandblasted again before re-cementing? If so, would an RBB usually be sent to a lab before re-cementing in practice? Would a ceramic crown that de-bonds also need a HF acid etch before re-cementing with an adhesive?  Thank you!

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If an RBB de-bonds, does the metalwork need to be sandblasted again before re-cementing? If so, would an RBB usually be sent to a lab before re-cementing in practice? Would a ceramic crown that de-bonds also need a HF acid etch before re-cementing with an adhesive?  Thank you!

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I've been looking through the 5th year Crown and Bridge Revision Lecture from 2018 and was unsure what PM1 and PM was referring to in this slide on occlusion:
'In this case, the length of the canine and PM1 can be adjusted so there’s group function/ canine and PM guidance.'
Might be glaringly obvious to others but I'm a bit confused!
Thanks :)

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Are there any guidelines to state when an ACC should be used over a MCC please? Thanks!

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When would you decide to remove/section a bridge due to failure? Are there any resources to explain this please?

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Are the window technique and the altered cast technique both used for flabby ridge?

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Are the window technique and the altered cast technique both used for flabby ridge?

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If a tooth has less than 50% tooth structure remaining, does this mean a direct (composite) core must be provided before provision of the indirect restoration. When would elective RCT and a post-core be justified?

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In a double abutment, which would fail and why - the primary abutment or the secondary abutment? In a cantilever, which is the primary abutment and which is the secondary abutment ? On vital it said: "The primary abutment is the double abutted pair nearest to the edentulous saddle".

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In a double abutment, which would fail and why - the primary abutment or the secondary abutment? In a cantilever, which is the primary abutment and which is the secondary abutment ? On vital it said: "The primary abutment is the double abutted pair nearest to the edentulous saddle".

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Is there an absolute indication for a 'Conventional' Cement... when Adhesive bonding is suitable for all tapers and height of coronal tooth structure, is there really an indication for conventional cementation anymore? Despite their longer clinical steps, they have greater bonding and tensile strengths and although technique sensitive (i.e. moisture control), conventional cements (e.g. AquaCem) is also highly soluble and can result in marginal loss of cement.

E.g. a posterior tooth - we may consider conventional cementation, but if we could achieve adequate isolation would we not prefer to place an adhesive cement?

So I was just wondering is there still space for conventional cementation, and maybe any indications/factors where you may use it over adhesive bonding?

Thank you!