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Biomedical subjects

Christopher D Lynch

Publications and source records attributed to Christopher D Lynch.

At least 19 recordsLinked to original sources
PubMed2006

Teaching the placement of posterior resin-based composite restorations in U.S. dental schools.

BACKGROUND: In light of the increased use of and demand for posterior resin-based composite restorations in dental practice, the authors investigated U.S. dental schools' current teaching with regard to placement of posterior composite restorations. METHODS: In early 2005, the authors invited 52 schools to participate in an e-mailed survey. RESULTS: The authors received 47 completed responses, for a 90 percent response rate. Although all schools provided didactic and clinical teaching in the placement of occlusal resin-based composites in posterior teeth, the survey results showed variation in teaching the use of two- and three-surface occlusoproximal composites. CONCLUSIONS: The survey findings demonstrate a marked change in instruction in placement of posterior resin-based composite restorations in U.S. dental schools during the last five to 10 years. However, the authors found much variation in the nature and extent of the instruction and techniques taught. CLINICAL IMPLICATIONS: Dental schools need to ensure that their graduating students are well-prepared for independent clinical practice.

Bicuspid↗
PubMed2006

Surface microhardness of a resin composite: a comparison of a tungsten halogen and a LED light curing unit, in vitro.

A comparison has been made between published surface microhardness numbers (VHN) of a commercial resin composite for different exposure times to a quartz tungsten halogen (QTH) and light-emitting diode (LED) light-curing unit (LCU). Both LCUs produced comparable hardness at both top and bottom surfaces, respectively, and similar bottom/top hardness ratios, for a specimen thickness of 1.5 mm, given sufficient exposure time (40 s) and an elapsed time of 24 h before measurement (for hardness numbers). However, some data are significantly different. There is no advantage in either LCU regarding optimal hardness and hardness ratios given an appropriate protocol. Immediate finishing (1 h) was more appropriate to the use of the LED LCU (with adequate exposure time). The effect of elapsed time after exposure on microhardness was more pronounced with the QTH LCU.

Analysis of Variance↗
PubMed2006

Teaching the use of resin composites in Canadian dental schools: how do current educational practices compare with North American trends?

The placement of resin composites in posterior teeth is now a common procedure in dental practice. The aim of this study was to investigate current teaching of this procedure in Canadian dental schools and to compare trends in teaching with those in the United States. This study complements other investigations in which we examined teaching of the use of posterior resin composites in dental schools in the United States, Ireland and the United Kingdom. A questionnaire was distributed by email to the faculty member in each of the 10 dental schools in Canada with responsibility for teaching the operative dentistry curriculum, including the placement of posterior resin composites. The response rate was 100%. More teaching of posterior resin composites was noted since the time of a survey in the late 1990s. The amount of teaching and clinical experience in the use of posterior resin composites in Canadian dental schools seems to be higher than in dental schools in the United States. As noted in surveys of other countries, variation among Canadian teaching programs was found to persist in relation to techniques and technologies used.

Canada↗
PubMed2005

Trends in indirect dentistry: 7. Communicating design features for fixed and removable prostheses.

UNLABELLED: Clear and effective communication of design features between dental practitioners and dental technicians has long been recognized as central to the production of high quality fixed and removable prostheses. In this respect, there is extensive evidence to demonstrate that the quality of communication achieved from general dental practice is not always adequate. Failure to communicate design features effectively can lead to errors in the fabrication of prostheses, or in the production of prostheses with a potential to cause damage to oral structures. CLINICAL RELEVANCE: The aim of this paper is to describe why it is important to communicate adequate design features clearly to dental laboratories.The paper also describes how this may be achieved for a variety of fixed and removable prostheses.

Adult↗
PubMed2005

Early surface microhardness of a resin composite exposed to a pulse-delayed curing exposure: a comparison of a tungsten halogen and a plasma arc lamp, in vitro.

Surface microhardness numbers of a commercial resin composite have been compared after exposure to a quartz tungsten halogen (QTH) and plasma arc (PAC) lamp respectively, using two exposure protocols. The effect of increased tip-to-composite distance has also been compared. Exposure with the PAC lamp tested is more appropriate to the early finishing of composite restorations after placement and curing than with the QTH. However both lamps were capable of producing comparable surface hardness, with appropriate exposure protocols. The effect of increased tip-to-composite distance was generally not significant between the lamps for continuous exposure.

Acrylic Resins↗
PubMed2004

Adult polyglucosan body disease: case description of an expanding genetic and clinical syndrome.

A non-Jewish patient is described who had adult polyglucosan body disease (APBD) and glycogen branching enzyme (GBE) deficiency without GBE mutation. A heterozygous polymorphism (Val160Ile) was found, and also discovered in 1 of 50 normal individuals. Magnetic resonance imaging demonstrated increased T2 signal in the midbrain, medullary olives, dentate nuclei, cerebellar peduncles, and internal and external capsules, with vermian atrophy. Both muscle and nerve biopsy revealed perivascular inflammatory infiltrates. These findings expand the clinical and genetic spectrum of APBD. Factors other than mutation of the expressed GBE gene may cause enzyme deficiency and varied expression and development of APBD.

Glucans↗
PubMed2004

The 'combination syndrome' revisited.

The 'combination syndrome' may present a considerable clinical and technical challenge to the dental practitioner. This clinical scenario classically relates to changes found in the mouth following use of a maxillary complete denture that has opposed natural mandibular anterior teeth. While this condition was first recognized over 30 years ago, the associated difficulties still pervade the practice of prosthetic dentistry today. The purpose of this article is to describe treatment of two patients who exhibited clinical features of this condition, and review some of the relevant literature on this condition.

Aged↗
PubMed2004

The swing-lock denture: its use in conventional removable partial denture prosthodontics.

This article describes the uses of the swing-lock retained removable partial denture in partially dentate patients where the potential for achievable retention with a conventionally designed removable partial denture is less than adequate. The article presents two case reports detailing effective use of the swing-lock concept in removable partial denture design and it is hoped that this article will increase the awareness of practitioners to the use of this prosthesis type when planning removable partial dentures.

Aged↗
PubMed2004

A modified copy technique for obturator prostheses.

Prosthodontic rehabilitation of patients following intra-oral surgical resection is often challenging for both the clinician and patient. With a general increase in life expectancy, it is reasonable that a definitive obturator prosthesis will need to be replaced at least once in the lifetime of a patient. The ability of a patient to become accustomed to such a new prosthesis is often limited by their increased age, and diminished neuromuscular skills and limited tissue support following surgical resection. The purpose of this paper is to describe a duplicating technique for obturator prostheses that has been adapted from conventional complete denture prosthodontics.

Aged↗
PubMed2004

The influence of coronal restoration type on the survival of endodontically treated teeth.

The aim of this study is to investigate the association between coronal restoration type and survival of endodontically treated teeth. A review was performed of treatment records of patients who had endodontic treatment performed in the Department of Restorative Dentistry, University Dental School & Hospital, Cork, Ireland during the period 1993-96. Demographic and dental factors such as age, gender, tooth type, coronal restoration type, and tooth status recorded at a review appointment were recorded. Tooth status at review was defined as 'tooth present' or 'tooth absent' based on the presence or absence of the endodontically treated tooth recorded in the treatment records at a review appointment held a minimum of one year following obturation of the root canal system. Of 176 teeth (166 patients) treated, survival of endodontically treated teeth was significantly more likely where restored with cast restorations (91.7%), amalgam restorations (86.5%), or composite restorations (83.0%), than teeth restored with temporary restorations (34.5%) (p<0.0001) (mean follow-up time 38 months, range 12-60 months). Survival of endodontically treated teeth was found to be associated with permanent coronal restorations. Loss of endodontically treated teeth occurred more often with those restored with temporary restorations (34.5%) than other restoration types (p<0.05).

Adolescent↗
PubMed2004

Surface microhardness of a resin composite exposed to a "first-generation" LED curing lamp, in vitro.

This investigation determined the minimum exposure times consistent with optimised surface microhardness parameters for a commercial resin composite cured using a "first-generation" light-emitting diode activation lamp. Disk specimens were exposed and surface microhardness numbers measured at the top and bottom surfaces for elapsed times of 1 hour and 24 hours. Bottom/top microhardness number ratios were also calculated. Most microhardness data increased significantly over the elapsed time interval but microhardness ratios (bottom/top) were dependent on exposure time only. A minimum exposure of 40 secs is appropriate to optimise microhardness parameters for the combination of resin composite and lamp investigated.

Composite Resins↗
PubMed2003

The use of microabrasion to remove discolored enamel: a clinical report.

There is an ever-growing demand for esthetic dental treatment. Treatment modalities include crowns, bleaching, and ceramic or composite veneers. A more conservative treatment option, enamel microabrasion, may be indicated in certain clinical scenarios. The purpose of this clinical report is to describe the use of enamel microabrasion for a patient with discolored anterior teeth.

Adult↗
PubMed2003

Opinions of Irish dental practitioners on dental nurse training.

AIM: The aim of this study was to investigate the opinions of Irish dental practitioners on dental nurse training. METHOD: A postal questionnaire was sent to 200 dental practitioners selected at random from the Irish Register of Dentists. Information sought included the importance of a dental nursing qualification when selecting employees, their opinions regarding the ideal qualities a dental nurse should possess, the appropriate duration and content of a training programme, and the willingness of the practitioner to participate in this training. RESULTS: Replies were received from 106 practitioners (response rate = 53%). Seventy-four respondents (70%) expressed a preference for employing a dental nurse with a recognised qualification. The three most important qualities identified for dental nurses were 'personality/manner' (70% of responses), 'interpersonal skills' (53% of responses) and 'knowledge of dental procedures' (32% of responses). Ninety-one respondents (86%) felt that a one year (or less) programme was a suitable duration for dental nurse training. Eighty-one respondents (76%) were willing to participate in the delivery of clinical training. CONCLUSIONS: From this limited investigation, a majority of dental practitioners felt that suitable dental nurse training programmes should be of up to 1 year's duration (86%), should incorporate an assessment of the trainee's clinical skills (94%), and were willing to participate in the delivery of clinical training (76%). These views should be considered in the design of future dental nurse training programmes.

Attitude of Health Personnel↗
PubMed2003

The National Dental Nurse Training Programme of Ireland.

The National Dental Nurse Training Programme of Ireland will commence in January 2004. This is the first Irish national training programme for dental nurses. It has been recognised by the Dental Council of Ireland as being suitable for purposes of registration on the Dental Nurse Register. The purpose of this article is to bring this training programme to the attention of Irish dental practitioners.

Curriculum↗