Operative dentistry mcqs for world class professionals. The main contraindication for use of composite for class iii, iv, and v restorations is an operating area that cannot be adequately isolated. By definition, are located on proximal surfaces of anterior teeth. Class ii amalgam restoration instructions by dr ywom duration. When preparing the conventional portion of a preparation on the root surface, the form of the preparation walls is the same as that of an amalgam preparation. Amalgam restorations are not indicated for placement on teeth in which they. Amalgam restorations account for a significant portion of all dental restorations. Most class v restorations that are in esthetic prominent areas are also appropriately restored with composite, in addition to esthetics, these materials with adequate. Comparative evaluation of microleakage in class ii. The gamma2 phase of amalgam is primarily responsible for the relatively high values of creep exhibited by some materials. A dental restoration or dental filling is a treatment to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants. Amalgam restorations are usually easier to finish and polish without damage to the adjacent surfaces. Condensation to adapt the amalgam to the preparation walls and matrix and to produce a restoration free of voids.
Class iii cavity preparation dr talha tooth enamel. Nuha alkanhal gadeer alotaibi haya alsuairy nouf alfawaz 2 rds. The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. Restorative dentistry class ii total practice solution. Amalgam longevity is an important issue for patients, governments, and dentists to define the cost of dental treatment. Page 3 of 11 bds final professional examination 2007 operative dentistry mcqs model paper 09. This restoration shows an old amalgam that needs to be replaced with composite. Restorative dentistry in primary teeth intercoronal restorations and stainless steel crowns norman tinanoff, dds, ms august 8, 2014 outline decisions to treat class i amalgam composite incomplete caries removal class ii amalgam composite restorative materials for intercoronal restorations stainless steel restorations. Class 2 composite or amalgam restorations, combined. Seminar tooth prep class ii amal tooth enamel dentin.
Class iii and v restorations on permanent teeth that cannot be. A total of eightyfour resin composite restorations and six amalgam restorations were replaced due to an identified failure. Class ii preparation and amalgam restoration rcdp youtube. Pdf cavity designs for class ii amalgam restorations. Study dentists saw subjects annually to conduct followup oral examinations and take bitewing radiographs. Amalgam restorations are stronger than other class iii direct restorations.
Because bonding to dentin is not as predictable or durable as bonding to enamel, in. The restoration may be a ml, dl, mf, or df restoration. Repair or replacement of defective restorations by. Cavity preparations university of toronto faculty of dentistry. Class iii, iv, and v direct composite and glass ionomer. The patient came to our attention for a regular check. Types of restorations dentistry columbia university. Management of class i and class ii amalgam restorations.
Amalgam is used for the restoration of many carious or fractured posterior teeth and in the replacement of failed restorations. Survival of class iii amalgam and composite restorations. The proposed restoration will be wide, replace a functional cusp or extend onto the anatomic root. They are of two broad typesdirect and indirectand are further classified by location and size. When turned on, a default mixing speed and length of time are shown in the display window. Class ii cavity preparation for use with dental amalgam in 1982. The dentists recorded differential reasons for restoration failure. Amalgam amalgam is an alloy in which mercury occurs as a main component. The restoration must be a class iii restoration on any permanent anterior tooth.
Having as low as possible mercury content in the restoration to improve strength and decrease corrosion. The final step for achieving excellent clinical results with class ii composite resin is gross contouring with a highspeed handpiece followed by finishing and polishing of the restoration. A classification system for variations in cavity design and finish has been developed for application on models of teeth with class ii cavities for amalgam restorations. The outline form of the class iii amalgam preparation may include only the proximal surface fig2a. Anterior cavity preparation class iii, class iv and class v almost all class iii and class iv restorations are appropriately restored with composite. Class ii amalgam cavity preparation and restoration youtube. Then place your cavity liner into the preparation before placement of a microhybrid or nanofill dental composite so you can clearly identify the composite on an xray. Raghad baidas rah alrefaie rasha alrasheed rana aldakheel. The primary indication for this type of class iii preparation is for the restoration of root surfaces, preparation the portion on the root surface that has no enamel. Class iii amalgam restorations usually are contraindicated in esthetically important areas because many patients object to metal restorations that are visible advantages. Class iii restorations are indicated for defects located on the proximal surface of anterior teeth that do not affect the incisal edge. This chapter presents information about class iii and v amalgam restorations. The authors placed traditional class i and class ii bonded and unbonded amalgam restorations in 76 patients. Class 2 slot preparation matrix bands and retainers contour, insert and place wedge purpose.
Class iii and v restorations on permanent teeth that cannot be isolated in high risk patients. Amalgam must be mixed according to the manufacturers instructions. Thus, the aim of this retrospective cohort study is to determine the survival of class iii amalgam and composite restorations in primary canines at the university of torontos pediatric dental clinic. Then the technique walks you through the placement of the substructure of the tooth with either a microhybrid or nanofill dental composite. Minimalintervention dentistry, such as repair or refinishing of localized defects of restorations, could increase the longevity of the amalgam restorations and reduce patient stress regarding treatment cost. The quality of routine class ii cavity preparations for amalgam article pdf available in acta odontologica scandinavica 471.
A first analysis revealed a class iii carious lesion on incisor 21. Evidencebased guidelines for planning and placing direct class ii. Class iii amalgam restorations are usually prepared on. Factors associated with greater likelihood of repair versus replace p amalgam versus composite resin restorations. Conversely, dental amalgam is recommended in class ii applications where. Clinical evaluation of amalgam bonding in class i and ii.
First you will see the preparation of the tooth, including etching and bonding. If you feel that facial access is in the best interest of the patient, you. After the amalgam is removed, the tooth is prepped. You may note the extra class vi which has since been added to the original classification. Pdf the quality of routine class ii cavity preparations. Distal surfaces of incisors and mesial surfaces of canine.
Class i,ii, iii and v restorations on primary teeth. The occlusal contacts are located predominately on surfaces that will be occupied by the restoration, with little or. Survival and reasons for failure of amalgam versus. Bss ii pdf created with pdffactory pro trial version 2 dental amalgam pdf created with pdffactory pro trial version 3. The patient has been anesthetized with one carpule of 2% xylocaine with 1. Class ii amalgam cavity preparation and restoration done by second year dental students for a class project in 2 rds class. Pdf a classification system for variations in cavity design and finish has been developed for application on models of teeth with class ii. Almost all class iii and class iv restorations are appropriately restored with composite. Its use has been supplanted by toothcolored restorations primarily composite, which have. Final restoration and evaluation of restoration 37 f.
Preparation the primary indication for this type of class iii preparation is for the restoration of root surfaces. Early failure of class ii resin composite versus class ii. Usually lingual access is the indicated approach for a class iii restoration. In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features. Therefore, a cavity prepared for amalgam restoration must provide for adequate.
Class v restorations class v restorations,by definition, include the gingival one third i. We decided to eliminate the carious lesion and proceed with a direct composite restoration of the cavity. This preparation, which involves accessing caries by the facial approach, followed the instrumentation sequence used for class iii preparations. Class vi carious lesions are lesions involving the cusp tips, however, it is very, very rare that just cusp tips would be affected, therefore this class is rarely used. Lazar class iii restoration unica anterior the patient came to our attention for esthetic rehabilitation. Tooth preparation for class ii amalgam restorations and its modifications 2. Less conservative cavity preparation when compared to that of esthetic restorative materials. Tofflemire, tband, compositight condensing and carving of amalgam using an amalgam carrier, add increments and condense using positive finger rest. In the period examined, class ii resin composite restorations were ten times more likely to be replaced at no cost to the patient than class ii dental amalgam restorations. Introduction amalgam although a brittle material, has been adequately serving as a restorative material since 175 years, understanding of its properties and judgment of the preparation design are the vital factors controlling its use. Class ii carious lesions occur on proximal surfaces of premolars and molars. Restorative dentistry in primary teeth decisions to treat. When traditional tooth preparation for an amalgam or composite restoration is not feasible or.
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