The first step is the development of the ideal cavity preparation. Cavity preparations university of toronto faculty of dentistry. If the carious lesion is present only in proximal surface and not involve the occlusal surface, the class ii cavity should include all pits. With the conventional amalgam alloy, the reaction between the ag3sn. The rationale of this study is to investigate reasons for failure of class.
Apr 30, 2014 class ii cavity preparation for amalgam and variations introduction. One integral component of the cavity form is cavosurface angle csa. Haya alwaalan najla alkhuzaim ghaida almashaan maha alhamdan 2. Amalgam cavity preparation class i preclinical operative dentistry dc, du 2. This part of the procedure is similar to that for a direct composite resin restoration. Pdf cavity designs for class ii amalgam restorations. Jul 20, 2015 an occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. Class i cavity preparation for amalgam compatibility mode. An occlusal cavosurface bevel is contraindicated in an amalgam cavity preparation. Fighting the controversies, amalgam, as a posterior restorative material has survived till date. Long axis of bur should be parallel with the long axis of the tooth or with a slight distal tilt 4.
A selfdesigned instrument to evaluate cavosurface angle for class i. Tin reacts with copper to form several cusn reaction products. Bernardo m, luis h, martin md, leroux bg, rue t, leitao j, et al. Comparative evaluation of combined amalgam and composite. Pediatric restorative dentistry types of restorations types.
In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features. Class i involves pits and fissure caries occlusal surfaces of posterior teeth. The nxt hg5 amalgam separator is included in the california bundle. Management of class i and class ii amalgam restorations with. Class ii cavity preparation for amalgam and variations introduction.
Design principles for class ii preparations oral health group. Operative dentistry principles of cavity preparation for amalgam. This preparation, which involves accessing caries by the facial approach, followed the instrumentation sequence used for class iii preparations. 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. Group a mesioocclusal preparation had the least fracture resistance value and group d mod cavity preparation had the highest fracture resistance. An evaluation of the fracture resistance of class 2 amalgam. The amalgam surface is burnished using the acorn or ball burnisher. No snhg reaction product is formed as occurs in the lowcopper amalgam reaction. Dec 01, 2012 a retrospective clinical study on longevity of posterior composite and amalgam restorations. Pdf operative dentistry principles of cavity preparation. Contact area carious lesion proximal view vertical section. Class ii cavity preparation for use with dental amalgam in 1982.
And it could also cost you a lot more money to fix. Table of contents pdf the development of resinbonding for amalgam restorations j. 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. Class ii defects affecting one or both proximal surfaces. Various types of composite r esin can be used for elevation traditional re. Since the advent of restorative dentistry, management and treatment of posterior proximal caries lesion has posed great. 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. Tutorial on class i cavity preparation amalgam restoration youtube. A line angle not present on a class i cavity preparation on. Preparation should be more mesial to the distal pit than directly centered over it 70. Preparation and finishing of cavosurface angle determines the integrity of amalgam tooth.
The popularity of amalgam arises from its excellent longterm performance, ease of use and low cost. This video will show how to prepare class i cavity for amalgam. Possess a uniform specified minimum thickness for strength 12mm. Extention of the preparation incisally, gingivally, mesially and distally untill the. Chapter 17 classes i, ii, and vi amalgam restorations groov, fissure and pit. Class i occlusal tooth preparation is begun by entering. Pediatric restorative dentistry columbia university.
The bottom line is you should get your cavity filled as soon as you can. Tooth preparation class i conservative class i amalgam restoration it is recommended to protect the pulp. A retainerless matrix for amalgam restorations sciencedirect. The procedure for the removal of the carious lesion is the same as that of a class i. All the specimens were subjected to compressive axial load in triaxial testing machine at a cross head speed of 1. 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. 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. Use the explorer to eliminate any flash or excess amalgam beyond cavosurfaces in fissures. Provide an approximate 90100 degree cavosurface angle which should result in 8090 degree amalgam at the margins. Amalgam cavity preparation class 1 free download as powerpoint presentation. 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.
The development of resinbonding for amalgam restorations. Survival and reasons for failure of amalgam versus composite posterior restorations placed in a randomized clinical trial. 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. A selfdesigned instrument to evaluate cavosurface angle for. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
If they are not deep enough, the amalgam will be too thin and tends to crack. The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. Amalgam is a brittle material with low edge strength and tends to chip under occlusal stress. Pdf class i cavity preparation for amalgam compatibility. Class ii cavity preparation for amalgam and variations. Class iii and v amalgam restorations pocket dentistry. Initial occlusal anatomy is created with the acorn carverburnisher. Lama alkahlan alanoud alsufayan rawan almobarraz rawan alsaif. For various instruments used during procedure of cavity i preparation. Allergic contact stomatitis, amalgam, mercury, fixed dental prosthesis, gingiva.
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. Amalgam cavity preparation class 1 tooth enamel animal. 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. In determining the ideal proximal outline form for a class ii. 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. It is indicated for the most conservative amalgam preparations see fig. It is a circumfer ential retainerless matrix that is less time consuming to manipulate than a copper band for large amalgam restorations. Class i and ii maxillary amalgam preparations flashcards.
Turner dental school, university of manchester, higher cambridge st, manchester m15 6fh. Amalgam fillings a mediamed dental patient education. Mjor department of anatomy, school of dentistry, university. Therefore, a cavity prepared for amalgam restoration must provide for adequate. In determining the ideal proximal outline form for a class ii amalgam cavity perparation in a molar the 1 axial wall should be 1.
Technical procedure tooth preparation complete the cavity preparation to meet the restora tive requirements for amalgam. Class ii cavity preparation introduction a class ii carious lesion develops apical to the contact area on the proximal surfaces of posterior teeth. Maha almohaimid nura alhedeithi rand alsaif shahad alghanem wassan almanie. Class i, ii, and vi amalgam restorations pocket dentistry. Amalgam restorations advantages strong, durable, economical. 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. Amalgam cavity preparation class 1 tooth enamel dentin. Amalgam fillings must engage undercuts within the cavity preparation so they will not dislodge.
1094 22 1089 131 972 1338 371 131 1169 1232 1124 116 682 268 544 1272 613 1472 740 869 1268 1291 1433 603 767 290 683 1478 117 523 1164 420