Abstract:
OBJECTIVE:To compare the mechanical behavior, and infer differences in fracture resistance, of mandibular molars with amalgam and composite MOD restorations to that of an unrestored molar. METHOD:Finite element models were developed for an unrestored molar and molars with MOD amalgam and composite restorations. The location and magnitude of maximum principal stress resulting from simultaneous mechanical and thermal loads were determined for each molar using a series of designed experiments. An analysis of variance was conducted with the components of stress to distinguish the relative influence of oral parameters and restoration on the stress distribution in each molar. RESULTS:The maximum principal stress in the unrestored molar was the largest of all three molars examined and occurred within the dentin along the pulpal wall. Maximum principal stresses in the molars with amalgam and composite restorations both occurred along the cavosurface margin. Maximum principal stresses in the molar with amalgam restoration occurred at the pulpal floor and lingual wall junction and resulted from large occlusal loads. Although occlusal loading had minimal effects on the stress distribution within the molar with composite restoration, low oral temperatures were responsible for the maximum principal stresses, which were found at the lingual margin and occlusal surface junction. CONCLUSION:There was no significant difference in the magnitude of maximum stress that occurred in the molars with amalgam and light curing composite restorations. However, the location and orientation of maximum stress in the restored molars were largely dependent on the restorative material. Although clinical studies report that tooth fracture occurs predominately to restored molars, the unrestored molar experienced the highest stress in this investigation. Therefore, the reduction in fracture resistance of restored posterior teeth appears to result from changes in the location of maximum stress resulting from mastication and temperature changes.
journal_name
J Dentjournal_title
Journal of dentistryauthors
Arola D,Galles LA,Sarubin MFdoi
10.1016/s0300-5712(00)00036-1keywords:
subject
Has Abstractpub_date
2001-01-01 00:00:00pages
63-73issue
1eissn
0300-5712issn
1879-176Xpii
S0300-5712(00)00036-1journal_volume
29pub_type
杂志文章abstract:OBJECTIVES:A monomer methacryloyloxydodecylpyridinium bromide (MDPB) has antibacterial activity before polymerization. Furthermore, the antibacterial agent is immobilized by the polymerization of MDPB and the resin-based material incorporating MDPB is able to show an antibacterial effect even after being cured. The pur...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/s0300-5712(97)00013-4
更新日期:1998-03-01 00:00:00
abstract::Replacement of pin-retained amalgam restorations is complicated by the loss of prime pin sites and remaining pin sites posing anatomical problems. Self-threading dentine pins can be removed with an ultrasonic handpiece, and the pin site reused with a large pin. Retention of replacement pins is similar to original pins...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/0300-5712(93)90109-4
更新日期:1993-10-01 00:00:00
abstract:OBJECTIVE:To analyse smear layers on human dentine using ac-impedance spectroscopy. METHODS:Dentine samples were prepared from extracted, sound, third molars. Impedance measurements were carried out on dentine samples before and after etching. After measuring, samples were examined under scanning electron microscope (...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2004.05.003
更新日期:2004-09-01 00:00:00
abstract:OBJECTIVE:The primary goal is to develop a self-cured polyacid-modified resin composite with good mechanical and rheological properties. To achieve such a goal, the aim of this study is to determine how volume filler fraction (VFF) affects mechanical properties and viscosities of such materials containing different fil...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/s0300-5712(03)00091-5
更新日期:2003-08-01 00:00:00
abstract::OBJECTIVES.: To compare the safety and plaque removal efficacy of two oscillating/rotating/pulsating toothbrushes (Oral-B ProfessionalCaretrade mark 7000 [PC 7000] and Oral-B 3D Excel [3DE]) and a high-frequency toothbrush (Sonicare(R) Advance, Philips Oral Healthcare; SA) in a single-use, examiner-blind, three period...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:
更新日期:2005-06-01 00:00:00
abstract:OBJECTIVES:this study aimed to synthesize AgNPs from green tea (GT) extract, forming GT-AgNPs, and to coat their surfaces with silica, resulting in light-colored Ag@SiO2 nanoparticles. MATERIALS AND METHODS:particles were characterized and tested for minimal inhibitory concentration (MIC), biofilm formation against St...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2020.103327
更新日期:2020-05-01 00:00:00
abstract:OBJECTIVES:Three luting cements based on zinc oxide phosphate, glass ionomer or composite resin were compared with respect to their influence on the anaerobic fermentation of sucrose by human oral bacteria. METHODS:Fifteen standardized samples of each of the three luting cements were prepared according to the manufact...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/s0300-5712(98)00027-x
更新日期:1999-01-01 00:00:00
abstract:OBJECTIVES:Dentifrices containing zinc reduce gingival inflammation and bleeding better than control dentifrices (no zinc). How zinc might work is not understood. We have shown that lysine decarboxylase (LdcE), an enzyme from Eikenella corrodens, converts lysine to cadaverine in dental biofilms. The lack of lysine impa...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2020.103533
更新日期:2020-11-12 00:00:00
abstract:OBJECTIVES:The objective of this study was to assess the clinical performance of a direct placement gallium alloy sealed with an established dentine adhesive system. In addition, microanalysis of a few gallium restorations that failed in clinical service was performed. Clinical factors such as pulpal sensitivity, fract...
journal_title:Journal of dentistry
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/s0300-5712(99)00051-2
更新日期:2000-02-01 00:00:00
abstract:OBJECTIVES:The present study compared the efficacies of the self-etching Teeth Primer (TP: 4-META), and the etchants Red Activator (RA; 65% phosphoric acid) and Green Activator (GA; 10% citric acid with 3% ferric chloride), for bonding to enamel and dentine of human primary and permanent teeth, when used with 4-META/MM...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2014.01.007
更新日期:2014-04-01 00:00:00
abstract:OBJECTIVES:To evaluate the influence of different surface treatments on the microtensile bond strength of a dual-cured resin composite to fiber posts. METHODS:Thirty-two glass methacrylate-based fiber posts (GC Corp.) were used in the study. Posts were divided into two groups, according to the surface pretreatment per...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2007.01.009
更新日期:2007-06-01 00:00:00
abstract::Pain following removal of impacted third molar teeth has proven to be a useful clinical model for evaluating oral analgesics. Moreover, as the underlying pathophysiology becomes elucidated the model serves as a tool for monitoring the relative contributions of different pain events, including peripheral and central se...
journal_title:Journal of dentistry
pub_type: 杂志文章,评审
doi:10.1016/0300-5712(94)90084-1
更新日期:1994-12-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to compare four finishing/polishing systems (F/P) on surface roughness and gloss of different resin composites. METHODS:A total of 40 disc samples (15 mm × 3 mm) were prepared from a nanofill - Filtek Supreme Plus (FS) and a micro-hybrid resin composite - Esthet-X (EX). Following 2...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2011.01.006
更新日期:2011-07-01 00:00:00
abstract::This satellite symposium was the fourth in a series for editors, publishers, reviewers and all those with an interest in scientific publishing. It was held on Wednesday 25th June 2014 at the IADR International meeting in Cape Town, South Africa. The symposium attracted more than 180 attendees. This symposium placed an...
journal_title:Journal of dentistry
pub_type:
doi:10.1016/j.jdent.2015.02.007
更新日期:2015-08-01 00:00:00
abstract:OBJECTIVES:This clinical study evaluated the long-term outcome and survival rate of all-ceramic cantilever resin-bonded fixed dental prostheses (RBFDPs) made of zirconia-ceramic with a single-retainer design to replace missing incisors. In addition, whether the reason for missing incisors has an influence on the longev...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2017.07.003
更新日期:2017-10-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to evaluate the effect of a zinc-based particle with ionic liquid as filler for an experimental adhesive resin. METHODS:The ionic liquid 1-n-butyl-3-methylimidazolium chloride (BMI.Cl) and zinc chloride (ZnCl2) were used to synthesize 1-n-butyl-3-methylimidazolium trichlorozincate ...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2020.103477
更新日期:2020-11-01 00:00:00
abstract:OBJECTIVES:To make an inventory of clinical studies on veneer restorations (VRs) using a meta-analysis review procedure and to aggregate an overall survival result for four types of VRs. METHODS:From the dental literature published from 1983 to November 1996, papers were selected using an in- and exclusion protocol in...
journal_title:Journal of dentistry
pub_type: 杂志文章,meta分析
doi:10.1016/s0300-5712(97)00023-7
更新日期:1998-05-01 00:00:00
abstract:OBJECTIVES:This in vitro study examined the resistance to displacement offered by guide planes and the displacement mechanics of a bilateral bounded saddle cast cobalt chrome alloy removable partial denture framework under conditions simulating an average initial fit. METHODS:A specially designed model mouth jig fitte...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/s0300-5712(01)00016-1
更新日期:2001-05-01 00:00:00
abstract:OBJECTIVES:Teeth in a patient's mouth in a dental office, or in the natural environment, represent very complex stimuli for the human color vision system. Predicting their perceived color is a daunting task at best. Colorimetry is designed mainly for the evaluation of uniform, flat, opaque, materials of fairly large si...
journal_title:Journal of dentistry
pub_type: 杂志文章,评审
doi:10.1016/j.jdent.2010.05.008
更新日期:2010-01-01 00:00:00
abstract::This study was undertaken to determine the influence that undergraduate training currently has on the formation of clinical management strategies for minimizing cross-infection, among final year dental students. A 10-page questionnaire was sent to final year dental students attending 15 of the UK's 16 dental schools. ...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/0300-5712(93)90155-j
更新日期:1993-04-01 00:00:00
abstract::The complexity of the oral environment, and ethical problems associated with studies of oral diseases in humans inevitably directed the attention to development of laboratory models, that simulate the human oral microcosm. These developments and in particular the in vitro 'artificial mouth' systems have progressed fro...
journal_title:Journal of dentistry
pub_type: 杂志文章,评审
doi:10.1016/s0300-5712(03)00009-5
更新日期:2003-03-01 00:00:00
abstract:OBJECTIVES:To evaluate the toothbrush wear resistance of infiltrated artificial white spot lesions following two infiltration strategies, and to assess their ultramorphology. METHODS:Flat enamel surfaces from freshly extracted bovine teeth were polished and immersed in a Buskes demineralising solution for 30 days to c...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2011.02.009
更新日期:2011-05-01 00:00:00
abstract:OBJECTIVES:In vitro studies show that milk or milk components may have cariostatic properties. However, the results of epidemiological studies on the association between intake of dairy products and dental caries have been inconsistent. The purpose of this cross-sectional study was to examine the association between in...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2010.04.009
更新日期:2010-07-01 00:00:00
abstract:OBJECTIVES:The aim of this study was to assess the prevalence of direct restorations in posterior teeth in children aged 12, from a birth cohort, and to test the association between the quality of the restorations and individual variables experienced in the life cycle. METHODS:All live-born children in Pelotas, in 200...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2019.103183
更新日期:2019-10-01 00:00:00
abstract:OBJECTIVES:To investigate the current prevalence of open access (OA) in the field of dentistry, the means used to provide OA, as well as the association between OA and citation counts. METHODS:PubMed was searched for dental articles published in 2013. The OA status of each article was determined by manually checking G...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2016.02.005
更新日期:2016-04-01 00:00:00
abstract:OBJECTIVE:This study aimed to evaluate the addition of copper nanoparticles (CuNp) on the clinical performance of a universal adhesive system used as etch-and-rinse (ER) and self-etch (SE). METHODS:216 restorations were randomly placed in 36 subjects according to the following groups: ERcu = etch-and-rinse with 0.1% C...
journal_title:Journal of dentistry
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.jdent.2019.103219
更新日期:2019-11-01 00:00:00
abstract:OBJECTIVES:To determine at 5 year follow-up the failure rate, wear rates and other aspects of clinical performance of direct composite inlays compared with conventional composite restorations placed incrementally. METHODS:100 matched pairs of restorations were originally entered into the trial. Each pair consisted of ...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/s0300-5712(00)00013-0
更新日期:2000-08-01 00:00:00
abstract:OBJECTIVES:Evaluate color and translucency of both non-colored and colored zirconia ceramics and compare them with corresponding properties of human dentine. METHODS:0.5mm thick samples of human (MSHD) and bovine (MSBD) dentine were obtained from 5 extracted human anterior maxillary teeth and 5 bovine incisors, respec...
journal_title:Journal of dentistry
pub_type: 杂志文章
doi:10.1016/j.jdent.2012.08.018
更新日期:2012-12-01 00:00:00
abstract:OBJECTIVES:Traditional mechanical methods of retaining restorative materials have been replaced to a large extent by tooth conserving adhesive restorative techniques. Because adhesives have been evolving so rapidly for the last few years, the timing is right for evaluating the clinical status of present day adhesives. ...
journal_title:Journal of dentistry
pub_type: 杂志文章,评审
doi:10.1016/s0300-5712(96)00070-x
更新日期:1998-01-01 00:00:00
abstract:OBJECTIVES:Astra Tech implants have been used to provide implant supported overdentures for 25 people, 13 with paired stud retention, 10 with paired magnetic retention and two with magnetic retention on three fixtures. RESULTS:The first case was completed in June 1990 and the last in May 1992. Of the 52 fixtures which...
journal_title:Journal of dentistry
pub_type: 临床试验,杂志文章
doi:10.1016/s0300-5712(97)87698-1
更新日期:1997-01-01 00:00:00