Amalgam also requires a minimum depth of a millimeter and a half in order to form its crystalline structure while composite fillings have no minimum depth. Since the advent of restorative dentistry, management and treatment of. Turner dental school, university of manchester, higher cambridge st, manchester m15 6fh. Class ii cavity preparation examination and amalgam set up the. Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay. Initial cavity preparation stage step 1 outline form and initial depth. If an enamel margin was left unsupported during cavity preparation for amalgam. Ashtha arya, reader, faculty of dental sciences, sgt university. Pdf cavity designs for class ii amalgam restorations. Fundamentals of tooth preparation virtual classroom fundamentals of cavity preparation part 2 live streamed tooth cavity preparation is the mechanical alternation of a tooth page 519. The amalgam surface is burnished using the acorn or ball burnisher. Amalgam class i amalgam preps cavity form flashcards quizlet. The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. Maha almohaimid nura alhedeithi rand alsaif shahad alghanem wassan almanie.
Class iii and v amalgam restorations pocket dentistry. Operative dentistry principles of cavity preparation for amalgam. Class ii cavity preparation examination and amalgam set up the examination and amalgam set up. Since the advent of restorative dentistry, management and treatment of posterior proximal caries lesion has posed great. The first step is the development of the ideal cavity preparation.
Increases in cavity volume associated with the removal of. Increases in cavity volume associated with the removal of class 2 amalgam and composite restorations. The procedure for the removal of the carious lesion is the same as that of a class i. If they are not deep enough, the amalgam will be too thin and tends to crack. Class ii cavity preparation examination and amalgam. Amalgam must be mixed according to the manufacturers instructions. When the caries rate is high, the amalgam is chosen over more expensive filling materials. In determining the ideal proximal outline form for a class ii. For example, if one was to think of a class i cavity as resembling a box, when. The development of resinbonding for amalgam restorations. This preparation, which involves accessing caries by the facial approach, followed the instrumentation sequence used for class iii preparations.
To compare and evaluate the clinical performance of silver amalgam and centionn in simple class i carious lesions in permanent molars. In determining the ideal proximal outline form for a class. Material used to restore a cavity, build up for crown characteristics. One year comparative evaluation of clinical performance of. Pdf operative dentistry principles of cavity preparation. Cavity preparations university of toronto faculty of dentistry. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The instruments used for cavity preparation and restoration are required during dental school college in pre clinical training it self. In determining the ideal proximal outline form for a class ii amalgam cavity preparation in a molar the 1. Removal of amalgam restorations from class 2 cavities has been shown to cause increases in cavity volume. Initial occlusal anatomy is created with the acorn carverburnisher. Contact area carious lesion proximal view vertical section.
Patients with localized deficiencies of amalgam restorations that were clinically judged to be suitable for repair or refinishing according to usphs criteria table 1, patients with more than 20 teeth, restorations in functional occlusion with an opposing natural tooth and at least one proximal contact area with an adjacent tooth, patients older than 18 years old. Pdf class i cavity preparation for amalgam compatibility. However, certain fundamentals are common to all class ii silver amalgam cavity preparations. Extention of the preparation incisally, gingivally, mesially and distally untill the. Lama alkahlan alanoud alsufayan rawan almobarraz rawan alsaif. Also, they do not want the floor flat because they want 1. This should be set up before bringing a patient to the chair. To reduce deterioration of the amalgam restoration.
Amalgam restorations advantages strong, durable, economical. Class i lesion affects the pit and fissures of posterior teeth surfaces involved are. Class i cavity preparation for amalgam compatibility mode. Amalgam fillings must engage undercuts within the cavity preparation so they will not dislodge. By having the pulpal floor rise and fall you can maintain that 1. In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features. Amalgam cavity preparation class i preclinical operative dentistry dc, du 2. The adaptation of a range of amalgam alloys to the cavosurface margin of class i cavity preparations was examined for two condensation techniques.
The patient has been anesthetized with one carpule of 2% xylocaine with 1. Restorative dentistry class ii total practice solution. Definition of cavity preparation cavity preparation is the mechanical alternation of a tooth to receive a restorative material, which will return the tooth to proper anatomical form, function, and esthetics. Four factors of class ii cavity preparations have a direct bearing upon the success of an amalgam restoration. Adaptation of dental amalgam to the cavosurface margin of. Patients with localized deficiencies of amalgam restorations that were clinically judged to be suitable for repair or refinishing according to usphs criteria table 1, patients with more than 20 teeth, restorations in functional occlusion with an opposing natural tooth and at least one proximal contact area with an adjacent tooth, patients older than 18. Pdf class i cavity preparation for amalgam compatibility mode. Class ii cavity preparation for amalgam and variations introduction. Apr 30, 2014 class ii cavity preparation for amalgam and variations introduction. The quality of routine class ii cavity preparations for amalgam.
Use the explorer to eliminate any flash or excess amalgam beyond cavosurfaces in fissures. This study investigated postoperative hypersensitivity at 1, 4, and weeks following resinbased composite rbc restorations of occlusal caries and its relationship with prepreparation baseline sensitivity and preparation related variables, including dentin caries activity, cavity dimension and volume, and lesion radiographic visibility. Class i, ii, and vi amalgam restorations pocket dentistry. An evaluation of the fracture resistance of class 2. Tutorial on class i cavity preparation amalgam restoration youtube. Lowcopper amalgam commonly consists of mercury 50%, silver 2232%, tin 14%, zinc 8% and other trace metals dental amalgams were first documented in a tang dynasty medical text written by su gong in 659, and appeared in germany in 1528.
No snhg reaction product is formed as occurs in the lowcopper amalgam reaction. This video will show how to prepare class i cavity for amalgam. Contains amalgam, has to be triturated, times differ on types of amalgams instrument. To hold amalgam before it is placed in the preparation characteristics. A total of 60 noncarious, freshly extracted human maxillary premolars were selected and were divided into. The outline form for the class i occlusal amalgam tooth preparation. Provide an approximate 90100 degree cavosurface angle which should result in 8090 degree amalgam at the margins. The quality of routine class ii cavity preparations for amalgam article pdf available in acta odontologica scandinavica 471. Tin reacts with copper to form several cusn reaction products.
Conservative tooth preparation is recommended to protect the pulp, preserve the strength of the tooth, and reduce deterioration of the amalgam restoration. Amalgam is indicated for the restoration of a class i, ii, and vi defect when the defect 1 is not in an area of the mouth where esthetics is highly important, 2 is moderate to large, 3 is in an area that will have heavy occlusal contacts, 4 cannot be well isolated, 5 extends onto the root surface, 6 will become a foundation for a full coverage restoration, and 7 is. Download file pdf fundamentals of cavity preparation amalgam by dr. The class ii silver amalgam cavity preparation consists of. 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. After ethical approval, patients were selected as per inclusion and exclusion criteria and class i cavity preparation was done under rubber dam isolation and randomly divided into two groups. If the carious lesion is present only in proximal surface and not involve the occlusal surface, the class ii cavity should include all pits. Class ii cavity preparation for amalgam and variations. Amalgam is a brittle material with low edge strength and tends to chip under occlusal stress. Scribd is the worlds largest social reading and publishing site. To get the perfect cavity you need to have the proper set of instruments to prepare the cavity and to restore it using any of the following filling materials zoe temporary, gic, composite, amalgam etc. Loose enamel rods at the gingival floor of a class ii amalgam cavity should be removed using. Postoperative hypersensitivity and its relationship to.
Management of class i and class ii amalgam restorations. Silver reacts in the same manner as a lowcopper amalgam, forming a gamma1 aghg product. Class i restorations restore defects on the occlusal surface of. Effect of thickness of cavity wall on fracture strength of.
Amalgam class 2 cavity preparation to remember wedge heavily and protect adjacent teeth start from round smallest bur and then go to cylinder and from high to low speed you need to be from 3 to 3. Class ii cavity preparation for use with dental amalgam in 1982. Amalgam cavity preparation class 1 free download as powerpoint presentation. In a cavity preparation cavosurface margin will be junction between. Most compound and complex cavity preparations require additional resistance and retention form. Chapter 17 classes i, ii, and vi amalgam restorations groov, fissure and pit. Class ii cavity preparation introduction a class ii carious lesion develops apical to the contact area on the proximal surfaces of posterior teeth. Operative dentistry mcqs for world class professionals. In determining the ideal proximal outline form for a class ii amalgam cavity perparation in a molar the 1 axial wall should be 1. Assisting for class 1 amalgam restoration place articulating paper between the maxiallry and mandibular teeth to check the occlusion.
Amalgam cavity preparation class 1 tooth enamel animal. The present study was conducted to evaluate the fracture resistance of dental amalgam restorations in various class 2 cavity designs. An occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. Class ii silver amalgam preparations will vary with the morphology, anatomy and extent of carious involvement of the individual tooth being restored. Adaptation of dental amalgam to the cavosurface margin of class i cavity preparations. The popularity of amalgam arises from its excellent longterm performance, ease of use and low cost. A total of 60 noncarious, freshly extracted human maxillary premolars were selected and were divided into 4 equal groups, consisting of 15 teeth each. The patient should bite down carefully and gently so as to not fracture the new restoration. Start studying class 2 cavity preparation powerpoint. Amalgam cavity preparation class 1 tooth enamel dentin.
Determination of cavity borders outlines and extention for prevention. Instruments used for cavity preparation and restoration. Table of contents pdf the development of resinbonding for amalgam restorations j. If you are well prepared, the steps in the cavity preparation should proceed smoothly without delay, and the patient will be more at. For various instruments used during procedure of cavity i preparation. Management of class i and class ii amalgam restorations with. Modified cavity preparation for class ii amalgam restorations. Associate professor and chairman, department of operative dentistry, university of puerto rico, school of dentistry, san juan, puerto rico department of operative dentistry university of puerto rico school of dentistry san juan, puerto rico 1. In the preparation of cavity class ii, for restoration with composite resin all cavosurface angles should be. Pdf the quality of routine class ii cavity preparations. Class 2 cavity preparation powerpoint flashcards quizlet. An evaluation of the fracture resistance of class 2 amalgam.
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