Successful Posterior Composites
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This textbook reviews the most current concepts, presents techniques for successful results, and demonstrates how to avoid common pitfalls.
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Successful Posterior Composites - Christopher D. Lynch
Catherine
Acknowledgements
I would like to say thank you
to the following people:
Professor Nairn Wilson for his continual encouragement and expert guidance during the preparation of this book.
My first teacher of adhesive dentistry, Professor Robert McConnell, for introducing me to the concepts of adhesive dentistry and posterior composite restorations, and who has taught me never to be afraid to embrace new ideas.
Professor Robin O’Sullivan, who has been my mentor and friend for many years … for teaching me that successful restorative and adhesive dentistry can only be truly understood in the context of oral biology, and in the structure and composition of the dental tissues with which we interact.
I am particularly indebted to Dr Igor Blum, Lecturer in Restorative Dentistry at the University of Bristol Dental School for writing Chapter 9; Dr Ali Kassir, Manchester University for Fig 2-3; Professor Robin O’Sullivan, Royal College of Surgeons – Medical University of Bahrain for Figs 2-8 and 5-1; Drs SB Jones and ME Barbour, University of Bristol Dental School for Fig 2-13; Dr Liam Jones for Fig 10-16. Sincere thanks to Mr Sam Evans and the staff of the Dental Illustration Unit at Cardiff University for their assistance in the production of many of the images in this textbook. Figures 4-7, 4-9, 4-10, 6-1, 9-2 and 9-3 are reproduced courtesy of Quintessence Publishing Co. Figure 10-6 is reproduced courtesy of Dental Update, and Figures 10-11b and 10-12 are reproduced courtesy of the Journal of the Canadian Dental Association. Thank you also to Ms Henriette Rintelen for producing the illustrations in this textbook, and Ms Mary O’Hara and the production staff at Quintessence UK for their expert support in producing the book.
Finally a big thank you
to my friends – Dr Liam Jones, Professor Jeremy Rees, and Dr Alan Gilmour – for their suggestions, words of encouragement, and for reviewing this textbook prior to publication.
Chapter 1
Posterior Composites: The State of Play
NHF Wilson and CD Lynch
Aim
New knowledge and understanding, and the commercial development of composite resin materials and associated bonding technologies, mean that the placement of composite resin in occlusal and all but the largest occlusoproximal cavities may, given appropriate technique, be considered predictable and effective. The aim of this chapter is to describe state-of-the-art approaches to the placement of posterior composites.
Outcome
After reading this chapter, the reader will understand how new knowledge and understanding and developments in the field of composite resin materials and bonding technologies have resulted in the predictable and effective placement of load-bearing composite restorations in posterior cavities.
Introduction
Attitudes to the placement of posterior composites have undergone significant changes in recent years. As recently as the late 1990s, guidance on the placement of composite resins in posterior teeth restricted the application to small occlusal and occlusoproximal cavities in premolar teeth, and preferably in those with limited occlusal function
. Educational surveys from that time demonstrated that most dental school graduates in Europe and North America had limited teaching in the placement of posterior composites, with many new dentists graduating with little or no clinical experience in their placement.
As a consequence of increased dental awareness in society, coupled with improvements in dietary and oral hygiene practices, many more patients, particularly younger patients, are now presenting with fewer and smaller lesions of caries than in the past (Figs 1-1 and 1-2). Such patients expect minimally interventive procedures, preferably using techniques that are described as aesthetic
or tooth coloured
(Fig 1-3). This, in association with commercial developments in composite resin materials and associated bonding technologies and lingering concerns over the safety of dental amalgam, has driven an increase in the placement of posterior composite restorations in general dental practice. For example, a survey of United Kingdom general dental practitioners in 2001 revealed, far from limiting the placement of composite to small cavities in premolar teeth, that almost one-half of general dental practitioners placed composite resin restorations in load-bearing cavities in molar teeth (Figs 1-4 to 1-6).
Fig 1-1 Mandibular dentition from a 30-year-old female, which is unrestored and caries free, albeit with some staining of occlusal fissures.
Fig 1-2 Bitewing radiograph from a healthy 35-year-old female demonstrating an absence of caries or restorations.
Fig 1-3 A recently placed composite restoration in the occlusal surface of a mandibular first molar.
Fig 1-4 A posterior composite restoration that has been in clinical service for over eight years.
Fig 1-5 The composite restorations in the maxillary premolars have been in clinical service for over 10 years. While there is some evidence of marginal staining, the restorations are serviceable. This is in contrast to the deteriorating dental amalgam restoration in the maxillary first molar.
Fig 1-6 An extensive posterior composite restoration in a root-filled maxillary first molar. This restoration has been in service for more than six years.
With ever increasing patient expectations, coupled with improvements in the physical properties of composite resin materials and bonding technologies, it is highly likely that the placement of composite resins in posterior teeth will continue to increase in clinical practice.
Are posterior composites effective?
The answer as to whether posterior composites are effective is a resounding yes
. While some studies, dating back to the 1990s, found that the longevity of posterior composites was not as favourable as that of dental amalgam restorations, these studies investigated the use of composite resins as a substitute rather than an alternative to the use of dental amalgam. More recent studies indicate that the survival of posterior composite restorations can match, or even exceed, that of restorations of dental amalgam if they are applied to the best possible advantage. Indeed, dental insurance claims data in North America indicate that the longevity of posterior composites placed in general practice has matched and even surpassed that of dental amalgams. This has also been seen in recent studies of posterior restorations placed in general dental practice in Europe. Furthermore, as our understanding of the science of composite resins and bonding technologies increases, and practitioners become all the more familiar with the techniques necessary to place good-quality resin composite restorations, the survival rates of posterior composites will improve further.
One of the keys to success when placing posterior composites is to recognise that they are an alternative to, rather than a substitute for, dental amalgam and, as such, require very different operative techniques to those appropriate for dental amalgam. Dental amalgam is the old workhorse
of operative dentistry. It is considered to be a forgiving, relatively easy material to place. In contrast, composite resins require meticulous attention to moisture control, must be placed using an incremental placement technique and are dependent on an array of equipment and devices including light-curing units, sophisticated matrix systems and multicomponent finishing processes, let alone the effective use of an appropriate dental adhesive. Notwithstanding these complexities, and the associated additional costs, the use of composite resins offers distinct advantages in clinical service over dental amalgams for the restoration of teeth damaged by caries and other insults.
Why is Composite Resin Better than Dental Amalgam?
Some of the advantages of appropriately applied composite resins over dental amalgams include:
a reduced need to remove sound tooth substance in preparation
opportunity to retain the restoration in non-retentive preparations through adhesive bonding to the remaining tooth tissues
an aesthetic tooth-coloured appearance (Fig 1-7)
reinforcement of the remaining tooth structure
increased fracture resistance of the restored tooth unit (Fig 1-8)
opportunity to repair and refurbish restorations in clinical service, thereby reducing the need for the total replacement of failing restorations (Fig 1-9).
Fig 1-7 While these dental amalgam restorations are clinically acceptable, they lack the aesthetics increasingly expected by patients.
Fig 1-8 Fractured tooth tissue adjacent to an extensive dental amalgam restoration in a mandibular first molar.
Fig 1-9 A repaired posterior composite restoration in a mandibular first molar; fracture of the distolingual cusp had occurred, and the area repaired with resin composite. A lighter shade of composite was selected to permit discrimination of underlying tooth tissue should further operative intervention be required.
Countering these advantages, there is evidence that posterior composites may be more susceptible to secondary caries than dental amalgams in cariogenic environments. Additionally, as and when total restoration replacement is indicated, dental amalgam, unlike most posterior composites, may be readily distinguished from remaining tooth tissue, thus limiting the risk of inadvertent removal of sound tooth tissue. As will be discussed later in this book, there are ways and means to minimise the effects of these limitations.
The Way Forward
For many practitioners, there is a growing ethical problem. Is it in the patient’s best interests to sacrifice sound tooth tissue to enable the effective application of dental amalgam, the tried and tested approach of 20th century operative dentistry, when it is possible to adopt minimally interventive preparation techniques through the use of a tooth-coloured alternative? It is suggested, as is now taught in many dental schools, that an adhesively bonded composite resin should be used to restore all but the largest initial lesion of caries, with particular techniques used if the preparation extends beyond the enamel cap, let alone subgingivally. Where dental amalgam has previously been used and the preparation may compromise the performance of a resin composite, as is often the case in the heavily restored dentitions of, for example, older patients, the reuse of dental amalgam may be the most efficient and effective restorative material. It should be remembered, however, that, once a preparation becomes complex and involves a number of surfaces of the tooth, an indirect cuspal coverage restoration will, in all probability, best enable the tooth to resist catastrophic failure under occlusal loading.
Given the above, it is apparent that a crossroads has been reached and passed in operative dentistry and the future will see continuing decline in the use of dental amalgam, albeit in some countries more quickly than others. Clinicians will need to move forward individually and collectively to work on continuing development in the application of resin composites and other tooth-coloured restorative systems. The goal is a style of operative dentistry that is less interventional and more aligned to the principle of the restoration of form, function and biomechanical performance of teeth than was possible with the approaches that dominated most of the 20th century.
Key Learning Points
Placement of posterior composites in occlusal and occlusoproximal load-bearing cavities is now a successful and predictable form of operative treatment. Selecting composite resin for placement in posterior cavities rather than dental amalgam effectively increases the lifespan of the restored tooth.
Composite resin is not tooth-coloured dental amalgam
; it is an alternative to dental amalgam and as such it should