Abstract:
OBJECTIVE:To investigate the mesial cervical concavity of maxillary first premolars and its relationship with root and canal configuration using cone-beam computed tomography (CBCT). DESIGN:Images of maxillary first premolars (n = 1056) were collected from patients (n = 601) who had undergonein vivo CBCT scanning. The root and canal number and morphology were evaluated. The following measurements of the mesial cervical concavity of the maxillary first premolars were evaluated in section images: dentine thickness (in concavity at the cemento-enamel junction), concavity angle, depression depth (distance from mesial dentinal surface at concavity to mesial proximity), concavity position (distance from mesial dentinal wall at invagination to the top of the mesial marginal ridge). The reliability of the data was analyzed with an unpaired Student's t test and Fisher's exact test. RESULTS:The percentages of maxillary first premolars with one root, two, and three roots were 55.5%, 43.7%, and 0.8% respectively. Mesial cervical concavity was recorded in 64.5% of single-root maxillary premolars. The prevalence of two-root maxillary first premolars with mesial cervical concavity was 73.8%. The means of the aforementioned four measurements were 1.705, 147.9, 1.640, and 5.247 mm. The values of dentine thickness (mm), depression depth (mm), and concavity position (mm) of the mesial cervical concavity were largest in two-root maxillary first premolars. The smallest concavity angle of the mesial cervical concavity was found in three-root maxillary first premolars. CONCLUSIONS:There is a high prevalence of mesial cervical concavity among maxillary first premolars. The mesial root concavity is more prevalent in single-rooted maxillary first premolars when there are two canals present, and its prevalence and degree of concavity increase with the number of roots.
journal_name
Arch Oral Bioljournal_title
Archives of oral biologyauthors
Fan L,Yuan K,Niu C,Ma R,Huang Zdoi
10.1016/j.archoralbio.2018.05.002subject
Has Abstractpub_date
2018-08-01 00:00:00pages
79-82eissn
0003-9969issn
1879-1506pii
S0003-9969(18)30150-Xjournal_volume
92pub_type
杂志文章abstract::A high molecular-weight mucin was purified from human submandibular-sublingual saliva. The purity of the mucin preparation was demonstrated by the absence of other salivary proteins, by antibody reactivity and by gel electrophoresis. After reduction with mercaptoethanol a putative link component with approximate Mr 15...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(90)90041-8
更新日期:1990-01-01 00:00:00
abstract::A common finding in Swedish children is hypomineralization in first molars of unknown cause. Little is known about the chemical composition of the disturbed enamel. The aim here was to analyse the concentration gradients for F, Cl, Na, Mg, K and Sr in hypomineralized enamel from 17 permanent molars by means of seconda...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(00)00113-8
更新日期:2001-03-01 00:00:00
abstract:OBJECTIVE:MUC1 is primarily involved in the protection of epithelial surfaces. Decreases in oral mucosal defence can be a predisposing factor for the development of oral mucosal diseases in the elderly. The aim of this study was to compare MUC1 expression level in oral mucosal epithelial cells of the elderly with that ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2011.02.007
更新日期:2011-09-01 00:00:00
abstract:OBJECTIVE:This study sought to investigate the possible association between clinical and radiographic data of the patients with the bacterial community profiles involved in cases of necrosis in primary root canals. METHODS:Microbial community profiles for 25 samples from necrotic deciduous root canals were analyzed us...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2014.05.012
更新日期:2014-08-01 00:00:00
abstract::Evidence was sought for urea-induced pH gradients in dental plaque microcosm biofilms cultured from the mixed salivary bacteria in a multi plaque 'artificial mouth'. Application of 500 mmol/l urea for short periods (6 min) to 5-8 mm maximum-thickness plaques induced intraplaque pH gradients of up to 0.7 pH units with ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(94)90147-3
更新日期:1994-06-01 00:00:00
abstract::Cyclic AMP phosphodiesterase (PDE) isozymes were isolated and characterized from the soluble fraction of rat parotid gland. Four main peaks containing PDE activity were obtained by Q-Sepharose Fast Flow column chromatography. The four peaks were identified as PDEs I-IV by kinetic properties, molecular-weight analysis ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(94)00139-3
更新日期:1995-02-01 00:00:00
abstract::These mechanoreceptors were studied with particular regard to their type and the distribution. In both species they were concentrated in the crests of transverse palatine rugae. In the mouse, Meissner corpuscles, glomerular corpuscles, and Merkel cell nerve endings were seen in every palatine ruga, though the first an...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(90)90014-2
更新日期:1990-01-01 00:00:00
abstract::The presence of human STRO-1(+)/CD146(+) periodontal ligament (PDL) cells has been reported, but obtaining a large amount of these cells is difficult. The purpose of this study was to evaluate the percentages of STRO-1(+)/CD146(+) cells in PDL cells and determine the effects of FGF-2 on the proliferation and multiline...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2011.12.003
更新日期:2012-06-01 00:00:00
abstract:OBJECTIVE:Few clinical techniques are available for the description of mechano-nociceptive function in human periodontal tissues. The objective of this study was to test a new technique for assessment of periodontal mechano-nociceptive function by direct application of controlled forces to the teeth and quantify site, ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2016.07.012
更新日期:2016-11-01 00:00:00
abstract::In a previous study, it was shown that tooth germs of neonatal homozygous parathyroid hormone-related protein (PTHrP)-knockout mice are penetrated or compressed by the surrounding alveolar bone, suggesting an important role for PTHrP in the formation and activation of osteoclasts around growing tooth germs. In order t...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(02)00026-2
更新日期:2002-09-01 00:00:00
abstract::The enzymatic degradation of sodium monofluorophosphate by whole saliva in patients with differing oral health status was compared Ten patients each with good or poor oral health were selected. Assessment of oral health status included indices of the amount of dental plaque, caries experience and counts of Streptococc...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(96)00118-5
更新日期:1997-02-01 00:00:00
abstract:OBJECTIVE:This in vitro study was undertaken to assess the effects of Galla chinensis extract on inhibition of enamel caries-like demineralization and to elucidate the role of the organic matrix of enamel in this process. DESIGN:Either regular or enamel disposed of its organic matrix both of bovine origin were exposed...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2009.06.007
更新日期:2009-09-01 00:00:00
abstract:OBJECTIVES:This study evaluated the level and mechanism of apoptosis in human gingival fibroblasts (HGF) and murine fibroblasts (NIH/3T3) treated with a titanium tetrafluoride (TiF4) varnish compared those treated with a sodium fluoride (NaF) varnish. METHODS:Cells were treated with a TiF4, NaF (both 2.45%F) or placeb...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2018.10.039
更新日期:2019-01-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to develop a composite scaffold with the optimal poly(lactic-co-glycolic acid) (PLGA) and bioactive glass proportions to provide an environment for bone tissue regeneration and repair. DESIGN:PLGA-bioactive glass composite scaffolds were prepared using a salt-leaching technique with...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2021.105041
更新日期:2021-01-08 00:00:00
abstract::Atrial natriuretic peptide (ANP), sodium nitroprusside and hydroxylamine increased cGMP accumulation in rat parotid acinar cells both in the presence and absence of forskolin but in a different manner. On the other hand, ANP decreased forskolin-stimulated cAMP accumulation, although sodium nitroprusside and hydroxylam...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(94)90139-2
更新日期:1994-07-01 00:00:00
abstract:OBJECTIVES:to investigate p16(INK4a) and p14(ARF) tumor suppressor gene methylation status, determine telomere length and assess the importance of these epigenetic and genetic parameters in the development of pleomorphic adenoma and carcinoma ex pleomorphic adenoma of the parotid salivary glands. MATERIALS AND METHODS...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2015.08.011
更新日期:2015-11-01 00:00:00
abstract::The first indication of cartilage formation was detected on day 14.5 of pregnancy in close connection to the ossifying mandible. A separated blastema was never observed. Thus the findings support the concept that the condylar cartilage develops from already differentiated cells, not from primary undifferentiated mesen...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(95)00105-0
更新日期:1996-01-01 00:00:00
abstract::Covalent intermolecular cross-links in collagen provide the dentine matrix with stability and tensile strength. The density of collagen cross-links varies depending on the site within the same tissue. This variation is probably due to factors such as the different amounts of stress and different turnover rates at the ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(93)90118-6
更新日期:1993-07-01 00:00:00
abstract:INTRODUCTION:Caries lesions in dental hard tissues autofluoresce when exposed to light of certain wavelengths, whereas sound tissues do not, and this can be used as an in vitro histological marker for dental caries. Detection of autofluorescence is the basis of KaVo DIAGNOdent™ technology, and provides objective feedba...
journal_title:Archives of oral biology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.archoralbio.2012.09.017
更新日期:2013-06-01 00:00:00
abstract::Most commercial dentifrices contain sodium lauryl sulphate, which oxidizes upon storage. The effects of aged sodium lauryl sulphate and its oxidative breakdown products on the conversion of amorphous calcium phosphate to hydroxyapatite were studied in vitro by a pH drop method. Hydroxyapatite was identified from its X...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(92)90085-m
更新日期:1992-03-01 00:00:00
abstract:OBJECTIVE:To test the association of child's growth/development status and socioeconomic variables with dental emergence patterns. DESIGN:A sample of 359 children belonging to a birth cohort of over 5000 children born in 1993 in Pelotas (Brazil) was studied in 1998-1999. Previously trained observers collected birthwei...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2006.12.001
更新日期:2007-06-01 00:00:00
abstract::Prednisolone (2 mg/kg) was injected daily for 14 days. Collagen and protein biosynthesis were measured in isolated molar and incisor pulps by the incorporation of [14C]-proline into protein and collagen in vitro. Collagen solubility, free proline content, prolyl hydroxylase activity, collagenolytic activity and DNA an...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(83)90153-x
更新日期:1983-01-01 00:00:00
abstract::Cheek pouches were removed from 9 BIO 87.20 adult-male hamsters, pinned out on cork sheets and fixed, then divided into segments and processed. Mallory stain showed complete orthokeratinization of the pouch epithelium with regular keratohyaline granules. With scanning electron microscopy, the morphology of the walls w...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(82)90185-6
更新日期:1982-01-01 00:00:00
abstract:INTRODUCTION:Chronic kidney disease (CKD) and dialysis treatment could affect oral mucosa and cause qualitative or quantitative changes of saliva. OBJECTIVE:The aim of the study was to investigate oral manifestations, unstimulated salivary flow rate (USFR), salivary pH value and biochemical composition of saliva in no...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2019.04.021
更新日期:2019-06-01 00:00:00
abstract::Mechanisms of primary fluid formation by macropodine mandibular glands were investigated in anaesthetized red kangaroos using ion-transport and carbonic anhydrase inhibitors. Bumetanide at carotid plasma concentrations of 0.005-0.1 mmol/l progressively reduced a stable, acetylcholine-evoked flow rate of 1.02 +/- 0.024...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(97)00074-5
更新日期:1997-10-01 00:00:00
abstract::The adherence of streptococci to hydroxyapatite spheroids (HAS) depended upon the strain used, the fermentable carbon source available during bacterial growth, the number of times a clinical isolate had been subcultured on laboratory media and the pre-treatment of the HAS. Sucrose greatly stimulated the secondary colo...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(83)90107-3
更新日期:1983-01-01 00:00:00
abstract::Simultaneous recordings of the activity of the masseter and anterior temporalis and of jaw movement were made on 10 healthy dentate volunteers while they chewed roasted peanuts in their habitual manner. The quantity of food taken was altered by varying (a) its total weight (mouthful) between 8 and 1 g, but with a fixe...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(91)90120-j
更新日期:1991-01-01 00:00:00
abstract:OBJECTIVE:We have already reported that chitosan inhibited the growth of cariogenic bacteria in vitro. This study was designed to evaluate whether chewing gum, containing chitosan, can effectively suppressed the growth of oral bacteria (total bacteria, total Streptococci, mutans streptococci (MS)) in saliva. METHODS:F...
journal_title:Archives of oral biology
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.archoralbio.2006.10.004
更新日期:2007-03-01 00:00:00
abstract:OBJECTIVE:The aim of this study was to assess the frequency of variations in tooth number, shape and position in the dental arch to determine if there are parts of the dental arch that show a higher prevalence of tooth variability. DESIGN:198 randomly selected Caucasian subjects (93 females, 105 males) aged between 10...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2011.11.009
更新日期:2012-06-01 00:00:00
abstract::The possible role of fibronectin in dental tissue repair was investigated by comparing its distribution and that of the 165-kDa fibronectin-binding membrane protein (165 kDa-FnBP) in odontoblasts underlying carious and sound dentine. By immunoperoxidase and light microscopy, fibronectin was localized in the dentine un...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(95)00068-z
更新日期:1995-11-01 00:00:00