Class ii cavity preparation introduction a class ii carious lesion develops apical to the contact area on the proximal surfaces of posterior teeth. Management of class i and class ii amalgam restorations with. Class ii defects affecting one or both proximal surfaces. The contours of the tooth are namely damaged, and therefore we must work with a matrix. The extension should ensure that all caries is removed from the dej, resulting in a very narrow peripheral seat of healthy dentin on the pulpal wall surrounding the caries. When the caries extends into the occlusal pits and fissures or if an existing class 2 amalgam or composite resin is being replaced, an isthmus width of one fourth to one third the intercusp distance is preferred to minimize wear of the composite resin in function. The evolution of the contemporary cavity preparation jada. Preparation for amalgam during the classic preparation, we create a composite cavity which has two parts occlusal and proximal. Pdf a classification system for variations in cavity design and finish has been developed for application on models of teeth with class ii. Principles of class 2 cavity preparation ppt xpowerpoint. When placement of proximal retention locks in class ii amalgam preparations is necessary, which of the following is incorrect. An evaluation of the fracture resistance of class 2 amalgam.
Predictable restoration of class 2 preparations with. Adaptability of two amalgams to finished cavity walls in class ii cavity preparations. Initial occlusal anatomy is created with the acorn carverburnisher. Class i and ii maxillary amalgam preparations flashcards. View and download powerpoint presentations on principles of class 2 cavity preparation ppt. It is defined as a cavity that is present on the proximal surfaces of. The designs and qualities of the cavities were assessed in. Class ii silver amalgam preparations will vary with the morphology, anatomy and extent of carious involvement of the individual tooth being restored. The effect of variations in the design of class ii cavity preparations on the marginal degradation of amalgam restorations was included as a study aim in a clinical trial. Amalgam restorations advantages strong, durable, economical.
Research has now shown that composite is no better than amalgam for reducing subsequent tooth fracturing figure 1. At that point, i stepped away and started to design a new cavity preparation from scratch, based on a rational hierarchy of needs figures 2 and 3. Dec 01, 2012 preparation design is seldom detailed in these studies, yet it is describable, measurable, amenable to scientific exploration, and simple enough to develop consensus. The remaining cavity preparation was filled in 2 mm depth increments and. Premolars with class 2 silver amalgam restorations m h elsherif m n halhoul a a kamar a nour eldin summary this article reports the fracture strength of maxillary premolars in which class 2 amalgam cavities were evaluated and were prepared and restored with silver amalgam. Amalgam restorations account for a significant portion of all dental restorations. This completes the initial amalgam preparation for class i caries. Four hundred and sixtyeight restorations were placed in 210 patients by 7 scandinavian dentists using 5 different alloys. Pdf cavity designs for class ii amalgam restorations. Instruments used for cavity preparation and restoration. In an ideal class ii amalgam preparation in a primary. The instruments used for cavity preparation and restoration are required during dental school college in pre clinical training it self. Design principles for class ii preparations oral health.
Pdf six hundred and ten epoxy plastic models, made from impressions of permanent teeth in which classii cavity preparations for amalgam. This article explores the clinical and scientific evidence for preparation axioms for simple to extensive class ii direct composites. The modified class ii preparation as described in this study performed poorly and cannot be recommended due to its failure. Amalgam must be mixed according to the manufacturers instructions. Volume 10, issue 2, marchapril 1960, pages 335340 modified cavity preparation for class ii amalgam restorations author links open overlay panel joseph rubinstein d. A though amalgam is considered an excellent material for restorative purposes, failures with it often occur in dental practice. Apr 21, 2017 participants completed a class ii cavity preparation and amalgam restoration, a class iv composite resin restoration and two preparations for a porcelainmetal full crown. Effect of thickness of cavity wall on fracture strength of pulpotomized primary molar teeth with class ii amalgam restorations. The outline form for several class ii amalgam preparations is shown in figure 217. The quality of routine class ii cavity preparations for amalgam article pdf available in acta odontologica scandinavica 471. Damage to the adjacent teeth was assessed under a stereomicroscope. Amalgam cavity preparation class 1 free download as powerpoint presentation. Modified cavity preparations for composite resins in primary molars. Nuha alkanhal gadeer alotaibi haya alsuairy nouf alfawaz 2 rds.
Because amalgam was the recommended restorative material, mechanical retention was required. Contact area carious lesion proximal view vertical section. Use the explorer to eliminate any flash or excess amalgam beyond cavosurfaces in fissures. A class ii restoration must be completed to pass the wreb exam. Pdf the quality of routine class ii cavity preparations for. Four hundred and sixtyeight class ii amalgam restorations were placed in 210 patients. Class ii carious lesions occur on proximal surfaces of premolars and molars. Adaptability of two amalgamsthe dispersedphase dispersalloy and the sphericalparticletype sybralloyto cavity walls in a class ii cavity preparation was investigated. Cavity preparations university of toronto faculty of dentistry. Changing concepts in class i and ii cavity preparation. Effect of thickness of cavity wall on fracture strength of.
The procedure for the removal of the carious lesion is the same as that of a class i. Six hundred and ten epoxy plastic models, made from impressions of permanent teeth in which classii cavity preparations for amalgam restorations had been. Filtek bulk fill posterior restorative clinical cases class ii amalgam. In the student clinic, resin composite is used in approximately 58 percent of class ii restorations placed, and dental amalgam is used in the remaining 42 percent. The mechanical alteration of a defective, injured, or diseased tooth in order to best receive a restorative material which will reestablish a healthy state for the tooth including esthetic corrections where indicated, along with normal form and function. In addition, the preparation for an amalgam restoration typically requires 90degree cavosurface margins and specific axial depths that allow incorporation of secondary retentive features. Cavity design and marginal degradation of the occlusal. 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. Pdf modified cavity preparations for composite resins in.
Health, general dental amalgams usage dental caries measurement molars analysis thickness measurement tooth fractures care and treatment. Class ii cavity preparation for amalgam and variations introduction. Class ii amalgam cavity preparation for amalgam mwl1958zk1nj. In an ideal class ii amalgam preparation in a primary molar, the buccal and lingual walls of the occlusal surface diverge. Class ii cavity preparation for amalgam when the lesion present in the proximal surface of premolars and molars, this requires class ii cavity preparation, which is either mo or do or mod. Baseline of a defective amalgam margin of the palatal cusp of a second upper molar. One proximal surface mesial or distal may be affected. The primary disadvantage of class iii and v amalgam restorations is that they are metallic and unesthetic. This fiveyear prospective clinical trial evaluated amalgam restorations with localized defects that were treated by means of repair or refurbishing. Tooth preparation for class ii amalgam restorations and its modifications. Since the advent of restorative dentistry, management and treatment of posterior proximal caries lesion has posed great. Amalgam is used for the restoration of many carious or fractured posterior teeth and in the replacement of failed restorations. The results of our study indicate that, in class ii approximal slot restorations, composite and compomer performed better than amalgam.
The contemporary cavity preparation for a class ii amalgam does not have a name. 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. Modified cavity preparation for class ii amalgam restorations. Traditional class ii amalgam preparations fall short of minimally invasive principles and are not usually optimal for the initial management of an approximal lesion. Class v cavity preparation for amaglam indications the selection of amalgam as a restorative material for class v cavity should involve the following considerations.
The restorations had been inserted by seven scandinavian dentists in their clinics, among their regularly attending patients. If the carious lesion is present only in proximal surface and not involve the occlusal surface, the class ii cavity should include all pits. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The conventional design resembles a class ii preparation for amalgam with some modification, and is.
When the caries rate is high, the amalgam is chosen over more expensive filling materials. However, certain fundamentals are common to all class ii silver amalgam cavity preparations. A small cavity was cut initially in the amalgam restoration until sound enamel and dentin could be seen at the pulp floor. Participants completed a class ii cavity preparation and amalgam restoration, a class iv composite resin restoration and two preparations for a porcelainmetal full crown. Class 2 cavity preparation for amalgam restorations 0 youtube. Cavity preparation definition of cavity preparation by. Portion of amalgam are condensed using a condensor stamen and. Replacement reasons and service time of classii amalgam. Continue to supply the dentist with more amalgam until the preparation is slightly overfilled. Excessive flare of the distobuccal cavosurface margin of a class ii amalgam cavity preparation will result in a dry and crumbly mix of amalgam can be the result of adjustments made to class ii amalgam preparations to ensure the tooth structure does not fracture under masticatory forces is a part of the during matrix band removal, the risk of. Preparation design is seldom detailed in these studies, yet it is describable, measurable, amenable to scientific exploration, and simple enough to develop consensus. Fiftytwo patients 50% female and 50% male, mean age 28. Pdf the dimensions of everyday classii cavity preparations for. Therefore, a cavity prepared for amalgam restoration must provide for.
Adaptability of two amalgams to finished cavity walls in. Cavity preparation designs vary according to extent of damage and the type of restorative. Class ii cavity preparations no mods on first primary molars 8. It is high time we fully realised the importance of preserving healthy tooth structure. Research, report by european archives of paediatric dentistry. Clinical evaluation of interpfoximal retention grooves in class ii. Loose enamel rods at the gingival floor of a class ii amalgam cavity should be. The class ii silver amalgam cavity preparation consists of. These will appear on the dentaljuce enhanced cpd certificate, along with the time spent, dates, and detailed topics you studied within the module. After finishin the class 1 out line we have to extend the proiximal side of the cavity so that a thin wall of about 1 mm in thick ness is left. Seminar tooth prep class ii amal tooth enamel dentin. Class ii cavity preparation for amalgam and variations. Application of 3m vitrebond light cure glass ionomer linerbase according to the instructions for use.
Amalgam cavity preparation class i preclinical operative dentistry dc, du 2. The guidelines given for the class i preparation should be followed during the preparation of the occlusal portion of the class ii preparation and, additionally, there are several recommendations for the proximal box preparation. Management of class i and class ii amalgam restorations. Early failure of class ii resin composite versus class ii. Pediatric restorative dentistry types of restorations types. Apr 30, 2014 class ii cavity preparation for amalgam and variations corrected the indian dental academy is the leader in continuing dental education, training dentists in all aspects of dentistry and offering. Using the information from remake request slips in a dental schools predoctoral clinic, we examined the shortterm survival of class ii resin composite restorations versus class ii dental amalgam restorations. C the amalgam is more difficult and technique sensitive. The existence of retention grooves increased the failure load for amalgam restorations, but it did not reveal any advantageous effect for composite restorations. The first step is the development of the ideal cavity preparation.
The lab simulations online learning module has clear and concise aims, objectives and anticipated outcomes, listed below. This document was uploaded by user and they confirmed that they have the. Nov 29, 2016 class 2 cavity preparation for amalgam restorations 0. Crosssectional view of class ii gingival floor position box is perpendicular to long axis rounded angles 12. Pdf the quality of routine class ii cavity preparations. Excessive flare of the distobuccal cavosurface margin of a.
Conservation of tooth structure is an important goal of cavity preparation. Impressions of the teeth with cavity preparations had been made, and epoxy casts fabricated. Bss ii pdf created with pdffactory pro trial version 2 dental amalgam pdf created with pdffactory pro trial version 3 introduction. D amalgam should be used for class ii restorations. Dental amalgam is used in all surfaces of posterior teeth and occasionally in the lingual pits of anterior teeth. The dimensions of the everyday class ii cavity preparations for. The composite generally uses a more conservative tooth cavity preparation. The dentist may want both ends of the carrier filled. Use of an adhesive, biomimetic, carioinhibitive restorative material allows even more conservative preparation. Evidencebased guidelines for planning and placing direct. Carbon paper, articulating paper after rubber dam removal before occlusal carving, amalgam is softer occlusion may be checked prior to cavity preparation. Tooth preparation for class ii amalgam restorations and its modifications 2.
From the time g v black, father of operative dentistry outlined the principles of cavity preparation, and stressed on extension for prevention, dentistry has taken long strides. Operative dentistry 2 chen zhi wuhan university school of stomatology. The amalgam surface is burnished using the acorn or ball burnisher. Class iii and v amalgam restorations pocket dentistry. An evaluation of the fracture resistance of class 2 amalgam restorations with different cavity designs on maxillary premolars kundoor shashank, dayanand gopalrao chole, banthu ranga department of conservative and endodontics, pdu dental college, kegaon, solapur, maharashtra, india. Fracture resistance of class ii approximal slot restorations. Characteristic cervical defects anatomical x clinical crown. Use of micro air abrasion to clean the cavity in preparation.