Abstract：
:The effects of thermal stress on the marginal leakage of resin composite restorations in bovine teeth were investigated by a method that preserved the specimens. The changes in marginal leakage of specimens with increasing numbers of thermal cycles were measured by an electrical conductivity method. Four brands of posterior resin composites were used to fill cylindrical cavities (2.0 mm in diameter and 1.5 mm in depth) on the labial surfaces of bovine incisors, according to the manufacturer's instructions. Thermal cycling stress was applied to the specimens for up to about seven weeks (9000 cycles). During this time, the electrical conductance between the pulp and a drop of physiological saline solution covering the resin restoration was measured periodically by application of an electrical potential (60 Hz, 10 Vp-p). Thermal stress increased the marginal leakage gradually, rather than step-wise. Even before application of any thermal stress, wide variations of marginal leakage were found among different specimens restored with the same brand of resin. Specimens with less initial leakage showed less increase in leakage, and vice versa, throughout the experimental period.
journal_name
J Dent Resjournal_title
Journal of dental researchauthors
Momoi Y,Iwase H,Nakano Y,Kohno A,Asanuma A,Yanagisawa Kdoi
10.1177/00220345900690100601subject
Has Abstractpub_date
1990-10-01 00:00:00pages
1659-63issue
10eissn
0022-0345issn
1544-0591journal_volume
69pub_type
杂志文章abstract：:The destabilizing effect of endodontic treatment upon teeth is still controversial. The purpose of this study was to investigate the effects of different steps of endodontic treatments upon the rigidity of teeth. Extracted untreated central maxillary anterior teeth were loaded (3.75 N), and deformations of the root we...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910608500416
更新日期：2006-04-01 00:00:00
abstract：:In comparison with control rats. chronic administration of isoproterenol (IPR) caused enlargement of the parotid and submandibular glands and the synthesis of apparently new proteins, probably by acinar cells. The parotid and submandibular saliva secreted in response to methoxamine or IPR differed markedly in protein ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345800590062001
更新日期：1980-06-01 00:00:00
abstract：:The synthesis of many polycarboxylic acids is reported. An account is given of their stability in aqueous solution and the properties of cements formed by their reaction with ion-leachable glasses. A copolymer of acrylic and itaconic acids was found to combine several favorable characteristics. ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345800590060801
更新日期：1980-06-01 00:00:00
abstract：:Hereditary diseases affecting the skeleton are heterogeneous in etiology and severity. Though many of these conditions are individually rare, the total number of people affected is great. These disorders often include dental-oral-craniofacial (DOC) manifestations, but the combination of the rarity and lack of in-depth...
journal_title：Journal of dental research
pub_type： 杂志文章,评审
doi：10.1177/0022034514529150
更新日期：2014-07-01 00:00:00
abstract：:There is a large variability between and among individuals in the physiology of mastication, but it is not known whether this produces a similar variability in the particle sizes of food boluses at the end of the chewing process. Food boluses obtained just before swallowing were analyzed in ten subjects (aged 36.7 +/-...
journal_title：Journal of dental research
pub_type： 临床试验,杂志文章
doi：10.1177/154405910408300713
更新日期：2004-07-01 00:00:00
abstract：:Previous studies show that both activin and Bmp4 act as crucial mesenchymal odontogenic signals during early tooth development. Remarkably, mice lacking activin-βA ( Inhba-/-) and mice with neural crest-specific inactivation of Bmp4 ( Bmp4ncko/ncko) both exhibit bud-stage developmental arrest of the mandibular molar t...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034517713710
更新日期：2017-09-01 00:00:00
abstract：:Soft lining materials undergo two processes when immersed in water. Plasticizers and other soluble materials are leached into the water, and water is absorbed by the polymer. The balance between these two processes affects both the compliance and dimensional stability of the materials. ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345830620061601
更新日期：1983-06-01 00:00:00
abstract：:Oxygen inhibits free radical polymerization and yields polymers with uncured surfaces. This is a concern when thin layers of resin are being polymerized, or in circumstances where conventional means of eliminating inhibition are inappropriate. In this study, we tested the hypothesis that viscosity, filler content, and...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910508400808
更新日期：2005-08-01 00:00:00
abstract：:Autosomal dominant mutations in PTH1R segregate with primary failure of eruption (PFE), marked by clinical eruption failure of adult teeth without mechanical obstruction. While the diagnosis of PFE conveys a poor dental prognosis, there are no reports of PFE patients who carry PTH1R mutations and exhibit any other ske...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034513513588
更新日期：2014-02-01 00:00:00
abstract：:Diet is recognized as one of the most important factors affecting the equilibrium of the oral bacterial flora. Studies related to dental caries development have focused mainly on the effect of carbohydrates. In the present work, using swabbing coupled with an immuno-colony-blot assay, we followed the indigenous oral b...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345900690030801
更新日期：1990-03-01 00:00:00
abstract：:The oral microbiome consists of a planktonic microbiome residing in saliva and an adhering microbiome (the biofilm adhering to oral hard and soft tissues). Here we hypothesized that possible differences in microbial composition of the planktonic and adhering oral microbiome on teeth can be related to the forces by whi...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034513511822
更新日期：2014-01-01 00:00:00
abstract：:Erupting first permanent molars of 5 1/2 to 6 1/2 year-olds are eminently suited for the clinical testing of potential caries-inhibiting techniques. Due to the rapid onset of caries in these teeth, accurate monitoring of new materials/regimes can be instituted and meaningful data obtained within one year of trial comm...
journal_title：Journal of dental research
pub_type： 临床试验,杂志文章
doi：10.1177/002203457705600301011
更新日期：1977-10-01 00:00:00
abstract：:Three single-composition, high-copper amalgams were analyzed for the composition of their before- and after-reaction phases. The method used was electron probe microanalysis. The results may be summarized as follows: All alloys consist essentially of Ag3Sn (gamma), Cu3Sn (epsilon), and, in some cases, Ag4Sn (beta). Wh...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345840630062301
更新日期：1984-06-01 00:00:00
abstract：:In this study, we analyzed the influence of prosthetic abutment height on marginal bone loss (MBL) around implants in the posterior maxilla. In this retrospective cohort study, the radiographically determined MBL was related to the height of the abutments of internal conical connection implants at 6 and 18 months post...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034513519800
更新日期：2014-07-01 00:00:00
abstract：:An intra-oral model system has been developed which uses a single-section technique for before-and-after measurements on the same tissue. This model allows for placement of sections of enamel at both buccal and approximal sites. These sections may be sound or possess white-spot lesions. This allows for the evaluation ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345870660091401
更新日期：1987-09-01 00:00:00
abstract：:Selected area reflection electron diffraction has been used to determine the phases present in the reaction zones surrounding the Ag-Cu eutectic dispersant in Dispersalloy amalgam. The experiments were carried out on two kinds of specimens, (1) Dispersalloy amalgam and (2) Dispersalloy amalgam using 30, 50, 75, and 10...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345770560090101
更新日期：1977-09-01 00:00:00
abstract：:The field of dental materials has undergone more of a revolution than an evolution over the past 100 y. The development of new products, especially in the past half century, has occurred at a staggering pace, and their introduction to the market has been equally impressive. The movement has mostly come in the area of ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034518822808
更新日期：2019-03-01 00:00:00
abstract：:A water-soluble lipopolysaccharide from Salmonella enteritidis and a phenol-soluble lipopolysaccharide from Leptotrichia buccalis were applied topically to the healthy marginal gingivae of beagle dogs. Saline was applied to contralateral areas as an internal control. Increases in vascular permeability were monitored b...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345860650020301
更新日期：1986-02-01 00:00:00
abstract：:Eugenol, in the 100 percent concentration in commercial use, was applied to a circumscribed area, 3 mm in diameter, of rat labial mucosa for 1 minute. Reaction periods of 15 minutes, 1, 2, 4 and 6 hours were then permitted. Using routine histological procedures for processing the experimental tissues, it was observed ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345780570110901
更新日期：1978-11-01 00:00:00
abstract：:Adhesion of restorative and protective materials to dentin is an important requirement for operative and preventive dentistry. Wettability and roughness are dentin substrate conditions that are critical to establishing good adhesion. This study examined superficial and deep dentin for variations in water contact angle...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345990780091001
更新日期：1999-09-01 00:00:00
abstract：:Eighteen different Streptococcus strains including S mutans, sanguis, mitis, salivarius, bovis, and 2F2, were assayed for their relative adsorption to synthetic hydroxyapatite and for quantities of lactic acid produced while in the adsorbed state. The results indicated that all S mutans and some S sanguis have an enha...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345770560101401
更新日期：1977-10-01 00:00:00
abstract：:Glass-ionomer cements (GICs) are regarded as aqueous gels made up of polyalkenoic acid salts containing ion-leachable glass fillers. The consequence of water permeation across the GIC-dentin interface is unknown. This study used SEM, field-emission/environmental SEM (FE-ESEM), and TEM to examine the ultrastructure of ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910408300403
更新日期：2004-04-01 00:00:00
abstract：:Medication-related osteonecrosis of the jaw (MRONJ), although initially believed to be exclusively associated with bisphosphonates, has been implicated in recent reports with additional drugs, especially the bone antiresorptive denosumab. The pathophysiology has not been fully elucidated, and no causal association bet...
journal_title：Journal of dental research
pub_type： 杂志文章,评审
doi：10.1177/0022034515572021
更新日期：2015-04-01 00:00:00
abstract：:Significant differences exist between human and Macaca fascicularis patterns of mandibular movement during mastication. Macaque patterns display less asymmetry, more uniformity, and limited lateral excursions when compared to humans for mastication of the same food. Different anatomical structures between the two spec...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345780570071301
更新日期：1978-07-01 00:00:00
abstract：:To determine the 'hard palate representing' area in the primary somatosensory cortex, we recorded somatosensory-evoked magnetic fields from the cortex in ten healthy volunteers, using magnetoencephalography. Following electrical stimulation of 3 sites on the hard palate (the first and third transverse palatine ridges,...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910708600313
更新日期：2007-03-01 00:00:00
abstract：:The presence and kinetics of bone-resorbing activity in periapical lesions were studied with a rat model system. Lesions were found to expand most rapidly between induction on day 0 and day 15 ("active phase"), with enlargement occurring at a slower rate thereafter (days 20 and 30, "chronic phase"), as assessed by mea...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345910700100901
更新日期：1991-10-01 00:00:00
abstract：:Mercury emitted from dental amalgam may select for increased numbers of antibiotic- or mercury-resistant commensal bacteria in patients and increase their risk for bacterial diseases that are resistant to common therapies. We hypothesized that the presence of dental amalgams would increase the level of mercury-, tetra...
journal_title：Journal of dental research
pub_type： 杂志文章,随机对照试验
doi：10.1177/154405910808700502
更新日期：2008-05-01 00:00:00
abstract：:Masticatory muscle silent periods were compared in normal subjects and in patients with MPD syndrome before and after a variety of psychological, physiological, and pharmacological forms of therapy. All patients initially showed prolonged silent periods in one or more of the muscles. There was a direct relationship be...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345810600030501
更新日期：1981-03-01 00:00:00
abstract：:The lack of a reliable bond test has hindered the elucidation of the mechanism for porcelain-metal bonding in dental systems, because a test capable of detecting differences among porcelain-metal bonds of various qualities is required before the reasons for these differences may be ascertained. A method was developed ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345880670020801
更新日期：1988-02-01 00:00:00
abstract：:The composition of the degradable glasses used in commercial dental glass-ionomer cements determines their leaching behavior and hence the properties of the cement. The objective of the present study was to assess if the composition and leaching in acetic acid solutions are reflected in the x-ray diffraction character...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345010800081601
更新日期：2001-08-01 00:00:00
