Abstract:
OBJECTIVE:A major aspect in evaluating the quality of dental materials is their physical properties. Their properties should be a best fit of the ones of dental hard tissues. Manufacturers give data sheets for each material. The properties listed are characterized by a specific value. This assumes (but does not prove) that there is no direction dependence of the properties. However, dental enamel has direction-dependent properties which additionally vary with location in the tooth. The aim of this paper is to show the local direction dependence of physical properties like the elastic modulus or the thermal expansion in dental hard tissues. With this knowledge the 'perfect filling/dental material' could be characterized. MATERIALS AND METHOD:Enamel sections of ∼400-500 μm thickness have been cut with a diamond saw from labial/buccal to palatal/lingual (canine, premolar and molar) and parallel to labial (incisor). Crystallite arrangements have been measured in over 400 data points on all types of teeth with x-ray scattering techniques, known from materials science. RESULTS:X-ray scattering measurements show impressively that dental enamel has a strong direction dependence of its physical properties which also varies with location within the tooth. Dental materials possess only little or no property direction dependence. Therefore, a mismatch was found between enamel and dental materials properties. CONCLUSION:Since dental materials should possess equal (direction depending) properties, worthwhile properties could be characterized by transferring the directional properties of enamel into a property 'wish list' which future dental materials should fulfil. Hereby the 'perfect dental material' can be characterized.
journal_name
Acta Odontol Scandjournal_title
Acta odontologica Scandinavicaauthors
Raue L,Hartmann CD,Rödiger M,Bürgers R,Gersdorff Ndoi
10.3109/00016357.2013.878391subject
Has Abstractpub_date
2014-11-01 00:00:00pages
591-6issue
8eissn
0001-6357issn
1502-3850journal_volume
72pub_type
杂志文章abstract:OBJECTIVES:The aim of this study was to evaluate the plaque pH level and ureolytic activity among children and adults of Karen Hill tribes. METHODS:Thirty-four children aged 6-10 years and 46 adults aged 20-38 years were interviewed regarding oral hygiene practices, sucrose intake and betel chewing. Caries experience ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2013.794952
更新日期:2014-04-01 00:00:00
abstract::Signs and symptoms of temporomandibular disorders (TMDs) and the frequency of radiologically observed abnormalities in the condyles of temporomandibular joints (TMJs) of adolescent violin players (VP group) were investigated in a group of 31 music students and in their age- and sex-matched controls (C group). All subj...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359609003536
更新日期:1996-08-01 00:00:00
abstract::The purpose of this study was to determine the sensitivity, specificity, positive and negative predictive values for Corah's Dental Anxiety Scale (DAS) and two modified versions of it (MDAS; MDAS/4). A questionnaire was mailed to a simple random sample of 1,190 25-year-old residents in the west of Norway in 1997. Half...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350050217091
更新日期:2000-12-01 00:00:00
abstract:OBJECTIVE:The clinical features of the early stages of bisphosphonate-related osteonecrosis of the jaw (BRONJ) in patients with breast cancer remain unclear. A retrospective cohort study was conducted of patients with breast cancer who received intravenous bisphosphonate (BP) treatment in a single center in order to cl...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2014.887772
更新日期:2014-11-01 00:00:00
abstract::When grown on agar, most Actinobacillus actinomycetemcomitans form circular and convex colonies with an internal star-shaped morphology. Such colonies adhere firmly to the agar, and when removed, a star-shaped imprint similar to that of the intact colony remains. This study was undertaken to determine the nature of th...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359009033622
更新日期:1990-10-01 00:00:00
abstract::Twenty patients complaining of symptoms deriving from their amalgam fillings and a non-patient group were assessed by means of the perceptual projective Defense Mechanism Test (DMT). The test protocols were scored for 130 DMT variables and analyzed by means of the multivariate statistical method Partial Least Squares ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359609003520
更新日期:1996-06-01 00:00:00
abstract::Microleakage was studied in class-II cavities restored with a calcium hydroxide liner and an adhesive system combined with two different posterior composite resins. The restorations were exposed to repeated loading when immersed in dye solution. The teeth were cut, and microleakage along the cavity walls and into dent...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359109005915
更新日期:1991-08-01 00:00:00
abstract::The present study describes a Swedish family in which the mother and her son were affected with signs of popliteal pterygium syndrome (PPS, OMIM 119500). Both individuals had bilateral complete cleft lip and palate, oral synechiae, paramedian pits on the lower lip, toe syndactyly and a piece of triangular skin overgro...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/000163500429334
更新日期:2000-04-01 00:00:00
abstract:IMPORTANCE AND OBJECTIVE:Reactive Oxygen Species (ROS) are oxygen-derived molecules that are unstable and highly reactive. They are important signaling mediators of biological processes. In contrast, excessive ROS generation, defective oxidant scavenging or both have been implicated in the pathogenesis of several condi...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章,评审
doi:10.3109/00016357.2014.954267
更新日期:2015-02-01 00:00:00
abstract:OBJECTIVE:To estimate the prevalence of dental erosive wear among five-year-olds in Bergen, Norway, and to investigate associations between background factors and the condition. METHODS:A total of 387 children received a dental examination in five Public Dental Service clinics in Bergen, Norway. The parents responded ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016357.2020.1791357
更新日期:2020-07-21 00:00:00
abstract::The purpose of this study was to record the caries status in children attending public primary schools in Nairobi. The sample comprised 513 children, 262 aged 6-8 years and 251 aged 13-15 years. The children were drawn from six randomly selected schools in the city. Clinical examination was carried out in a room with ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359209012772
更新日期:1992-10-01 00:00:00
abstract::Fluorescent microspheres (FM) were used to visualize and semi-quantify blood flow in the temporomandibular joint (TMJ) during experimental unilateral traumatic occlusion of the maxillary and mandibular molar teeth in 30 young rats. At different postoperative observation periods varying from 1 to 30 days FM were inject...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359309040580
更新日期:1993-10-01 00:00:00
abstract::An interdisciplinary strategy based on a theoretical model for studying dental health was used to analyze the relevance of social and behavioral factors in the evaluation of dental health care for school children. The study comprised pupils who, after a total period of 5 years, differed in their experience with preven...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016358409035248
更新日期:1984-04-01 00:00:00
abstract:OBJECTIVE:To investigate the effect of storage duration on the tensile bond strength of acrylic and silicone-based denture base materials with liners either heat-cured or auto-cured. MATERIAL AND METHODS:The denture liners investigated were Vertex soft (acrylic-based, heat-cured), Coe soft (acrylic-based, auto-cured),...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350510019667
更新日期:2005-02-01 00:00:00
abstract:OBJECTIVE:Since the properties of polymers can be influenced using electron-beam irradiation, the aim of this study was to investigate whether electron-beam post-curing can improve the mechanical properties of experimental denture base polymers. MATERIAL AND METHODS:Rectangular specimens of different experimental poly...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350701278781
更新日期:2007-06-01 00:00:00
abstract::The aim was to describe the macroscopic and microscopic findings of areas with radiologic erosions in the human temporomandibular joint. An autopsy material of 40 human joints, removed as blocks, was examined with tomography, and an erosion was found in 37 areas. A macroscopic and a microscopic examination focused on ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016359209012751
更新日期:1992-04-01 00:00:00
abstract:OBJECTIVE:The purpose of the study was to compare the effects of two distinct collar geometries of implants on stress distribution in the bone as well as in the fixture-abutment complex, in the framework and in the veneering material of 3-unit fixed partial denture (FPD). MATERIAL AND METHODS:The 3-dimensional finite ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2011.597775
更新日期:2012-01-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to compare ligature-induced alveolar bone loss between obese and non-obese rats. MATERIAL AND METHODS:Thirty female Wistar rats were randomly divided into two groups: a test group comprising 14 rats fed with a "cafeteria diet" for 120 days in order to gain weight and a control group...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350802004672
更新日期:2008-06-01 00:00:00
abstract:OBJECTIVE:To determine chitosan-based chewing gum role on reducing salivary S. mutans counts and salivary pH. MATERIALS AND METHODS:The present double-blind randomised clinical trial with the trial registration number of IRCT20190724044319N1 was conducted on 36 dental students. The volunteers were, randomly, divided i...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016357.2020.1836392
更新日期:2020-11-03 00:00:00
abstract::Fifty-one patients (mean age, 47.3 years) with moderate to severe periodontal disease and 40 patients (mean age, 48.9 years) with symptoms related to bruxism (occlusal parafunctions such as grinding and/or clenching of the teeth) were compared with regard to periodontal conditions and signs and symptoms of mandibular ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016358709097536
更新日期:1987-08-01 00:00:00
abstract::The aim of this study was to compare the effectiveness of Carisolv with that of two other alkaline substances: NaOCl and Ca(OH)2. Sixty extracted teeth were randomly divided into three groups and split down the center of a carious lesion. In group I, one half of the cavity was excavated with NaOCl (0.5%, pH 11.7), the...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350510019810
更新日期:2005-04-01 00:00:00
abstract::In Drosophila the Toll family, a group of transmembrane proteins, plays crucial roles in the host defense against invading pathogens. Mammalian species also conserve this system as the Toll-like receptor (TLR) family, which includes more than 10 members that have been identified so far. Both the Toll and TLR families ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章,评审
doi:10.1080/000163501750266701
更新日期:2001-06-01 00:00:00
abstract::The aim was to construct and illustrate the use of diagnostic standards for recording of DFS incidence. Separate standards are presented for ranking of subjects; the mean "intermediate" DFS score per subject, which represented the majority decision of three dentists; and a certainty scale for individual tooth surfaces...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357709055996
更新日期:1977-05-01 00:00:00
abstract::Oral adhesion of yeasts probably occurs by interaction between yeast cell adhesins and oral epithelial cell receptors. In Candida albicans mannoprotein, glucan, chitin, cell wall proteins, and lipids are possible adhesins. Mannoprotein appears as a fibrillar or floccular outermost layer in stationary-phase cells grown...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章,评审
doi:10.3109/00016359009012733
更新日期:1990-02-01 00:00:00
abstract:OBJECTIVE:The aims of this study were to investigate the influence of deproteinization of dentin on the shear bond strength (SBS) mediated by eight dentin adhesives, and to evaluate the long-term durability of the SBSs. The hypotheses were that deproteinization of dentin would not affect the capacity for adherence, and...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.1080/00016350600633177
更新日期:2006-08-01 00:00:00
abstract::A series of rapid and simple chromatographic purification procedures for peroxidase-like enzymes occurring in the human oral cavity is presented. Samples of whole saliva, parotid saliva, gingival exudate and various bacterial preparations contain peroxidases which were purified using molecular exclusion and ion exchan...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357609002561
更新日期:1976-01-01 00:00:00
abstract:OBJECTIVE:This cross-sectional study assessed the prevalence and severity of the enamel defects, known as Molar-Incisor Hypomineralization (MIH) and its relationship to dental caries. MATERIALS AND METHODS:A sample of 1157 schoolchildren (population based), aged 6-12 years, of the Araraquara city-Brazil, was evaluated...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2012.734412
更新日期:2013-05-01 00:00:00
abstract:INTRODUCTION:The aim of this study is to compare the root canal transportation with the PathFile-ProTaper recommended protocol, PathFile-ProTaper modified protocol and stainless steel K-flexofiles. METHODS:Forty-five ISO 15, 0.02 taper S-shaped Endo Training Blocks were divided randomly into three groups of 15 each an...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2013.805430
更新日期:2014-01-01 00:00:00
abstract::The enzyme beta-glucuronidase (E.C. 3.2.1.31.) has been studied in developing teeth and bone of Sprague-Dawley rats and Macaque monkeys (Macaca Irus) by means of histochemistry using naphthol-AS-BI-beta-D-glucuronide as substrate and hexazotized pararosanilin as coupling reagent. Since beta-glucuronidase is sensitive ...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357509026357
更新日期:1975-01-01 00:00:00
abstract:OBJECTIVE:To determine if the differing contrast resolution of various LCD monitors affects the reliability or accuracy of measurements of proposed implant sites. MATERIALS AND METHODS:Edentulous areas of human dry skulls were marked with radiopaque markers in order to standardize the plane of the transverse cross-sec...
journal_title:Acta odontologica Scandinavica
pub_type: 杂志文章
doi:10.3109/00016357.2012.741709
更新日期:2013-09-01 00:00:00