Amalgam cavity preparation class 1 free download as powerpoint presentation. In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features. It is indicated for the most conservative amalgam preparations see fig. Turner dental school, university of manchester, higher cambridge st, manchester m15 6fh. Dec 01, 2012 a retrospective clinical study on longevity of posterior composite and amalgam restorations. Possess a uniform specified minimum thickness for strength 12mm. The development of resinbonding for amalgam restorations. Group a mesioocclusal preparation had the least fracture resistance value and group d mod cavity preparation had the highest fracture resistance. 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. Amalgam is a brittle material with low edge strength and tends to chip under occlusal stress. Pdf cavity designs for class ii amalgam restorations. Design principles for class ii preparations oral health group. Tin reacts with copper to form several cusn reaction products.
Preparation should be more mesial to the distal pit than directly centered over it 70. No snhg reaction product is formed as occurs in the lowcopper amalgam reaction. The amalgam surface is burnished using the acorn or ball burnisher. Class i occlusal tooth preparation is begun by entering. Maha almohaimid nura alhedeithi rand alsaif shahad alghanem wassan almanie. In determining the ideal proximal outline form for a class ii. The bottom line is you should get your cavity filled as soon as you can. Long axis of bur should be parallel with the long axis of the tooth or with a slight distal tilt 4. Comparative evaluation of combined amalgam and composite. Class i, ii, and vi amalgam restorations pocket dentistry. A line angle not present on a class i cavity preparation on. A selfdesigned instrument to evaluate cavosurface angle for class i.
Tutorial on class i cavity preparation amalgam restoration youtube. Apr 30, 2014 class ii cavity preparation for amalgam and variations introduction. Cavity preparations university of toronto faculty of dentistry. 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. The fate of amalgam restoration is determined by geometry of the cavity preparation and cavosurface angle is one integral part of the cavity, which decides the marginal characteristics of the restoration and health of the tooth. The procedure for the removal of the carious lesion is the same as that of a class i. Reasons for the failure of class i and ii amalgam restorations secondary caries has been reported by many papers to take place in areas of plaque stagnation, most likely in gingival walls of class ii restorations. Class ii cavity preparation for amalgam and variations introduction. Amalgam cavity preparation class i preclinical operative dentistry dc, du 2. Extention of the preparation incisally, gingivally, mesially and distally untill the. 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. Class i involves pits and fissure caries occlusal surfaces of posterior teeth. You would suspect major connectors of a cast maxillary partial denture are beaded at the periphery in order to a line angle not present on a class i cavity preparation on tooth 1.
Use the explorer to eliminate any flash or excess amalgam beyond cavosurfaces in fissures. Class i cavity preparation for amalgam compatibility mode. Class ii cavity preparation introduction a class ii carious lesion develops apical to the contact area on the proximal surfaces of posterior teeth. An evaluation of the fracture resistance of class 2 amalgam. Survival and reasons for failure of amalgam versus composite posterior restorations placed in a randomized clinical trial. A selfdesigned instrument to evaluate cavosurface angle for. The popularity of amalgam arises from its excellent longterm performance, ease of use and low cost. Pediatric restorative dentistry types of restorations types. With the conventional amalgam alloy, the reaction between the ag3sn. Pdf class i cavity preparation for amalgam compatibility. Amalgam cavity preparation class 1 tooth enamel animal. Lama alkahlan alanoud alsufayan rawan almobarraz rawan alsaif. Operative dentistry principles of cavity preparation for amalgam. For various instruments used during procedure of cavity i preparation.
Class ii cavity preparation for amalgam and variations. Allergic contact stomatitis, amalgam, mercury, fixed dental prosthesis, gingiva. One integral component of the cavity form is cavosurface angle csa. The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. This video will show how to prepare class i cavity for amalgam. 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. A retainerless matrix for amalgam restorations sciencedirect. Amalgam cavity preparation class 1 tooth enamel dentin. Management of class i and class ii amalgam restorations with. This preparation, which involves accessing caries by the facial approach, followed the instrumentation sequence used for class iii preparations. Mjor department of anatomy, school of dentistry, university. 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. Class iii and v amalgam restorations pocket dentistry. Preparation and finishing of cavosurface angle determines the integrity of amalgam tooth.
Various types of composite r esin can be used for elevation traditional re. 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. Jul 20, 2015 an occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. If they are not deep enough, the amalgam will be too thin and tends to crack.
Fighting the controversies, amalgam, as a posterior restorative material has survived till date. Pediatric restorative dentistry columbia university. Technical procedure tooth preparation complete the cavity preparation to meet the restora tive requirements for amalgam. Table of contents pdf the development of resinbonding for amalgam restorations j. And it could also cost you a lot more money to fix.
Chapter 17 classes i, ii, and vi amalgam restorations groov, fissure and pit. Amalgam restorations advantages strong, durable, economical. Amalgam fillings must engage undercuts within the cavity preparation so they will not dislodge. Class ii cavity preparation for use with dental amalgam in 1982. Class ii cavity preparation for amalgam and variations corrected published on apr 30, 2014 the indian dental academy is the leader in continuing dental education, training dentists in all aspects. The nxt hg5 amalgam separator is included in the california bundle. Class ii defects affecting one or both proximal surfaces. This part of the procedure is similar to that for a direct composite resin restoration. If you are well prepared, the steps in the cavity preparation should proceed smoothly without delay, and the patient will be more at ease and confident.
All the specimens were subjected to compressive axial load in triaxial testing machine at a cross head speed of 1. Initial occlusal anatomy is created with the acorn carverburnisher. Amalgam fillings a mediamed dental patient education. Tooth preparation class i conservative class i amalgam restoration it is recommended to protect the pulp. Therefore, a cavity prepared for amalgam restoration must provide for adequate. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Class i and ii maxillary amalgam preparations flashcards. The rationale of this study is to investigate reasons for failure of class. Silver reacts in the same manner as a lowcopper amalgam, forming a gamma1 aghg product. Pdf operative dentistry principles of cavity preparation. Another clinical study in which the maxillary posterior teeth were restored with amalgam and composite, reported that 11 out of 12 restorations scored excellently after 6. Contact area carious lesion proximal view vertical section. An occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation.
If the carious lesion is present only in proximal surface and not involve the occlusal surface, the class ii cavity should include all pits. Haya alwaalan najla alkhuzaim ghaida almashaan maha alhamdan 2. Provide an approximate 90100 degree cavosurface angle which should result in 8090 degree amalgam at the margins. In determining the ideal proximal outline form for a class ii amalgam cavity perparation in a molar the 1 axial wall should be 1.
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