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. Therefore, a cavity prepared for amalgam restoration must provide for adequate. Class ii defects affecting one or both proximal surfaces. 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. Chapter 17 classes i, ii, and vi amalgam restorations groov, fissure and pit. A retainerless matrix for amalgam restorations sciencedirect. A selfdesigned instrument to evaluate cavosurface angle for. Maha almohaimid nura alhedeithi rand alsaif shahad alghanem wassan almanie. Contact area carious lesion proximal view vertical section. Survival and reasons for failure of amalgam versus composite posterior restorations placed in a randomized clinical trial. Bernardo m, luis h, martin md, leroux bg, rue t, leitao j, et al. Design principles for class ii preparations oral health group. This part of the procedure is similar to that for a direct composite resin restoration.
Class ii cavity preparation for use with dental amalgam in 1982. Possess a uniform specified minimum thickness for strength 12mm. Extention of the preparation incisally, gingivally, mesially and distally untill the. 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. Fighting the controversies, amalgam, as a posterior restorative material has survived till date.
The bottom line is you should get your cavity filled as soon as you can. Amalgam is a brittle material with low edge strength and tends to chip under occlusal stress. Pdf class i cavity preparation for amalgam compatibility. The development of resinbonding for amalgam restorations. Various types of composite r esin can be used for elevation traditional re. Table of contents pdf the development of resinbonding for amalgam restorations j. In determining the ideal proximal outline form for a class ii amalgam cavity perparation in a molar the 1 axial wall should be 1. Pdf cavity designs for class ii amalgam restorations. Initial occlusal anatomy is created with the acorn carverburnisher. An evaluation of the fracture resistance of class 2 amalgam. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
This video will show how to prepare class i cavity for amalgam. And it could also cost you a lot more money to fix. 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. Tooth preparation class i conservative class i amalgam restoration it is recommended to protect the pulp. Tutorial on class i cavity preparation amalgam restoration youtube. If they are not deep enough, the amalgam will be too thin and tends to crack. This preparation, which involves accessing caries by the facial approach, followed the instrumentation sequence used for class iii preparations. 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. It is a circumfer ential retainerless matrix that is less time consuming to manipulate than a copper band for large amalgam restorations.
The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. The popularity of amalgam arises from its excellent longterm performance, ease of use and low cost. Class i and ii maxillary amalgam preparations flashcards. Amalgam cavity preparation class 1 tooth enamel animal. Preparation should be more mesial to the distal pit than directly centered over it 70. 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 nxt hg5 amalgam separator is included in the california bundle. Class iii and v amalgam restorations pocket dentistry. Amalgam cavity preparation class 1 tooth enamel dentin. Provide an approximate 90100 degree cavosurface angle which should result in 8090 degree amalgam at the margins. All the specimens were subjected to compressive axial load in triaxial testing machine at a cross head speed of 1. The first step is the development of the ideal cavity preparation.
Since the advent of restorative dentistry, management and treatment of posterior proximal caries lesion has posed great. Mjor department of anatomy, school of dentistry, university. The procedure for the removal of the carious lesion is the same as that of a class i. A line angle not present on a class i cavity preparation on. In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features.
An occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. Dec 01, 2012 a retrospective clinical study on longevity of posterior composite and amalgam restorations. Pdf operative dentistry principles of cavity preparation. Turner dental school, university of manchester, higher cambridge st, manchester m15 6fh. No snhg reaction product is formed as occurs in the lowcopper amalgam reaction.
Amalgam fillings a mediamed dental patient education. In determining the ideal proximal outline form for a class ii. Haya alwaalan najla alkhuzaim ghaida almashaan maha alhamdan 2. Preparation and finishing of cavosurface angle determines the integrity of amalgam tooth.
For various instruments used during procedure of cavity i preparation. Class i, ii, and vi amalgam restorations pocket dentistry. Class ii cavity preparation for amalgam and variations. Operative dentistry principles of cavity preparation for amalgam. Class i cavity preparation for amalgam compatibility mode. 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. It is indicated for the most conservative amalgam preparations see fig. Class ii cavity preparation for amalgam and variations introduction. One integral component of the cavity form is cavosurface angle csa. A selfdesigned instrument to evaluate cavosurface angle for class i. 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. The rationale of this study is to investigate reasons for failure of class.
Tin reacts with copper to form several cusn reaction products. Class i involves pits and fissure caries occlusal surfaces of posterior teeth. If the carious lesion is present only in proximal surface and not involve the occlusal surface, the class ii cavity should include all pits. Cavity preparations university of toronto faculty of dentistry. Lama alkahlan alanoud alsufayan rawan almobarraz rawan alsaif. Technical procedure tooth preparation complete the cavity preparation to meet the restora tive requirements for amalgam. Class i occlusal tooth preparation is begun by entering. Amalgam fillings must engage undercuts within the cavity preparation so they will not dislodge. Group a mesioocclusal preparation had the least fracture resistance value and group d mod cavity preparation had the highest fracture resistance. Jul 20, 2015 an occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. Apr 30, 2014 class ii cavity preparation for amalgam and variations introduction. Pediatric restorative dentistry columbia university. Pediatric restorative dentistry types of restorations types.
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. Class ii cavity preparation introduction a class ii carious lesion develops apical to the contact area on the proximal surfaces of posterior teeth. The amalgam surface is burnished using the acorn or ball burnisher. Comparative evaluation of combined amalgam and composite. Allergic contact stomatitis, amalgam, mercury, fixed dental prosthesis, gingiva. Amalgam cavity preparation class i preclinical operative dentistry dc, du 2. Amalgam cavity preparation class 1 free download as powerpoint presentation. Management of class i and class ii amalgam restorations with.
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