Abstract:
:Subtraction radiography requires radiographs made with identical projection geometry. Recently a new radiographic aiming device and an x-ray beam manipulator made it possible to repeat radiographic exposures in vivo with small angular errors and to measure the angular errors occurring. The purpose of the present investigation was to study in vivo the measuring error and the angular errors produced by this new method at different time points (0, 6, and 12 months) and to assess the effect of different time intervals between exposures (0, 6, and 12 months). Ten sites were investigated. At each time point 2 exposures were made, resulting in 6 radiographs per site. For each pair of radiographs the measuring errors occurring during analysis and the projection errors were determined for each time point and for each time interval. Friedman's test and t-test were used to evaluate the errors. A difference in the measuring error of the system and in the angular errors at the time points 0, 6, and 12 months could not be detected. A time interval between exposures also did not have an effect on the measuring error. Time did not affect the vertical and horizontal angular errors measured between the radiographs producing the smallest oblique error. A combination of radiographs producing the largest oblique angular error showed an increase of the horizontal and vertical angular errors when the time interval increases. These effects, however, were not statistically significant.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
J Periodontoljournal_title
Journal of periodontologyauthors
Zappa U,Simona C,Graf H,van Aken Jdoi
10.1902/jop.1993.64.4.278subject
Has Abstractpub_date
1993-04-01 00:00:00pages
278-84issue
4eissn
0022-3492issn
1943-3670journal_volume
64pub_type
杂志文章abstract:BACKGROUND:Cementum formation is considered to be a critical event for successful regeneration of periodontal tissues. Cementoblasts share many characteristics with osteoblasts. Prostaglandin E(2) (PGE(2)) is an important local factor in bone metabolism. Although the effects of PGE(2) on osteoblasts are well known, its...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2006.060148
更新日期:2006-12-01 00:00:00
abstract::Bacterial invasion of the pocket epithelium and underlying connective tissue was found in seven cases of advanced human periodontitis. Four cases showed invasion of the epithelium as well as the connective tissue while in the other three cases bacterial invasion was limited to the pocket epithelium. The microorganisms...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1984.55.10.567
更新日期:1984-10-01 00:00:00
abstract::This study was a first stage evaluation of the plaque inhibitory properties of an experimental cetylpyridinium chloride (CPC)/essential oil mouthrinse. The study was a formulation, not ingredient, evaluation and comparisons were made with established mouthrinse products. The 5 rinses tested were: the experimental form...
journal_title:Journal of periodontology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1902/jop.1994.65.10.904
更新日期:1994-10-01 00:00:00
abstract:BACKGROUND:Different surgical approaches have been proposed to treat peri-implantitis defects with limited effectiveness and predictability. Laser has been proposed as an effective tool to assist in bacterial decontamination and modulating peri-implant tissue inflammation. The aim of this pilot clinical trial was to ev...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1002/JPER.20-0040
更新日期:2020-08-06 00:00:00
abstract:BACKGROUND:Human periodontal ligament stem cells (hPDLSCs) are readily accessible and represent a promising source of mesenchymal stem cells (MSCs) for therapies. For expected clinical applications of stem cell therapies, prolonged maintenance of stemness of hPDLSCs after storage is crucial. Likewise, optimization of c...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2016.150693
更新日期:2016-07-01 00:00:00
abstract::A system of nomenclature for deformities of the alveolar process is presented. Descriptive, familiar topographic terms are used (crater, trench, moat, ramp and plane), and specific criteria are given for each term. Two hundred randomly selected osseous deformities in dry skulls were classified by two examiners at inde...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1984.55.6.336
更新日期:1984-06-01 00:00:00
abstract:BACKGROUND:Maxillary periodontal surgery typically requires multiple injections and may inadvertently affect facial structures such as the upper lip, lateral aspect of the nose, and lower eyelid. To minimize these sequelae and reduce the number of total injections, a relatively new injection technique has been proposed...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2008.070621
更新日期:2008-09-01 00:00:00
abstract::The purpose of this study was to determine which treatment of a large osseous defect adjacent to an endosseous dental implant would produce the greatest regeneration of bone and degree of osseointegration: barrier membrane therapy plus demineralized freeze-dried bone allograft (DFDBA), membrane therapy alone, or no tr...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1997.68.10.933
更新日期:1997-10-01 00:00:00
abstract:BACKGROUND:It has been shown that cigarette smoke inhalation (CSI) and estrogen deficiency (OVX) may affect bone quality around titanium implants; however, their association has not been evaluated. Therefore, this study aimed to verify the effects of CSI associated with OVX on bone healing around titanium implants. ME...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2006.050190
更新日期:2006-04-01 00:00:00
abstract:BACKGROUND:Autologous bone can be harvested from the flutes of a conventional drill or from a bone scraper; here we compared whether autologous bone chips generated by a new slow-speed instrument were more osteogenic than the bone chips generated by conventional drills or bone scrapers. Additionally, we tested whether ...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1002/JPER.19-0524
更新日期:2020-12-01 00:00:00
abstract:BACKGROUND:In an attempt to evaluate the influence of cyclosporin A (CsA) on fibroblast metabolism, the phospholipase C beta1, (PLC beta1) nuclear expression was evaluated in fibroblasts from heart transplantation patients treated with CsA who exhibited gingival overgrowth (GO) and from controls. METHODS:PLC beta1 was...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2000.71.11.1722
更新日期:2000-11-01 00:00:00
abstract:BACKGROUND:Relative few reports exist concerning healing of laser created osteotomies over an extended period of time. The purpose of this study was to evaluate long-term healing, from 21 to 63 days, of osteotomy defects in the rat tibia created with the Nd:YAG and CO2 in the presence of a surface cooling spray of air/...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2001.72.2.174
更新日期:2001-02-01 00:00:00
abstract:BACKGROUND:Some studies have reported an association between gestational diabetes mellitus (GDM) and periodontitis. The aim of the present study is to analyze this potential association and the influence of risk variables associated with GDM. METHODS:This case-control study includes 360 women, 90 with GDM and 270 cont...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2012.120350
更新日期:2013-09-01 00:00:00
abstract:BACKGROUND:Various forms of stress behavior were documented and in patients with periodontitis their relationship with periodontal disease was investigated. METHODS:Eighty-nine patients with different forms of chronic periodontitis were included in this retrospective case-control study. They were all undergoing period...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2002.73.11.1343
更新日期:2002-11-01 00:00:00
abstract:BACKGROUND:Prefabricated implant abutments made of zirconium dioxide (yttria-stabilized polycrystalline tetragonal zirconia; Y-TZP) have proved to be useful in the esthetically demanding anterior region and may also be useful for premolar and molar replacement because of their obvious positive impact on the health of p...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2009.090274
更新日期:2009-12-01 00:00:00
abstract::This short report offers solutions for three common clinical problems. Based on their experience, the authors suggest using a "spoon" type partial denture for the temporary replacement of maxillary anterior teeth. The denture is unique in that it has no clasps and does not contact the marginal gingiva. Also, conventio...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1984.55.6.341
更新日期:1984-06-01 00:00:00
abstract:BACKGROUND:The number of immunocompromised patients is increasing as a consequence of successful organ transplantation. Placing dental implants in these patients has been questioned because of their increased risk for infections. The 10-year follow-up data of a 71-year-old liver transplant recipient with long-term immu...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2004.75.6.909
更新日期:2004-06-01 00:00:00
abstract:BACKGROUND:A wide selection of Interdental Oral Hygiene (IOH) aids is available to consumers. Recommendations for selection are, however, limited by the lack of direct comparisons in available studies. We aimed to assess the comparative efficacy of IOH aids using Bayesian Network Meta-Analysis (BNMA). METHODS:Two inde...
journal_title:Journal of periodontology
pub_type: 杂志文章,meta分析,评审
doi:10.1002/JPER.17-0368
更新日期:2018-05-01 00:00:00
abstract:BACKGROUND:Combined periodontal regenerative technique (CPRT) is a surgical procedure that combines the use of barrier membranes with a filling material in the treatment of periodontal defects. The effectiveness of CPRT has been evaluated in many studies in comparison to GTR with membranes alone, but conflicting result...
journal_title:Journal of periodontology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1902/jop.2002.73.2.158
更新日期:2002-02-01 00:00:00
abstract::We report a case of multiple facial gingival recession which was improved by non-surgical and supportive periodontal therapy. The patient, a 28-year-old Japanese woman, presented for treatment of multiple facial gingival recession ranging from 1 to 4 mm on teeth 5 through 12 and 19 through 30. Periodontal plastic surg...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1999.70.8.909
更新日期:1999-08-01 00:00:00
abstract:BACKGROUND:The minimum inhibitory concentration (MIC) does not provide information on the efficacy of antimicrobial agents against infections involving biofilms, which are many times more resistant than planktonic forms of bacteria. This report is on the design and initial trial of a device for growing standard biofilm...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2005.76.9.1443
更新日期:2005-09-01 00:00:00
abstract::Supragingival plaque and calculus indices, salivary flow rates, pH, ionic and total calcium concentrations, total phosphate concentration, and the number of cervical restorations and caries lesions were measured in 29 subjects using systemic beta-(beta) blockers and in 28 subjects who were not taking any systemic medi...
journal_title:Journal of periodontology
pub_type: 临床试验,杂志文章
doi:10.1902/jop.1996.67.4.428
更新日期:1996-04-01 00:00:00
abstract::A new flap design for placement of implants into osseous defects has been described. The flap design can be used in anterior and posterior areas of human subjects. Photographs of representative cases are presented. Wound healing always occurred by primary intention and without evidence of immediate graft exfoliation. ...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1985.56.4.204
更新日期:1985-04-01 00:00:00
abstract::Extensive data collected over the past decade demonstrate clearly that diseaseactive and disease-inactive periodontal pockets exist, disease progression is infrequent and episodic, and most progression occurs in a small proportion of highly susceptible individuals. Furthermore, traditionally used diagnostic procedures...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1992.63.4s.356
更新日期:1992-04-01 00:00:00
abstract::Sensory innervation of gingival tissue can cause neurogenic inflammation that depends on the extent of the branching area of the peripheral nerve fibers. We designed the present study to determine whether single trigeminal axons branch to both the buccal and palatal gingiva of maxillary molars of adult rats. Accumulat...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1995.66.9.817
更新日期:1995-09-01 00:00:00
abstract::There are few studies that provide information on the natural history of calculus formation. The purpose of this study is to evaluate the relationship between pre-scaling baseline calculus scores, the time since the last prophylaxis before baseline, and scores 8 weeks after scaling in a group of presumed heavy calculu...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1994.65.8.750
更新日期:1994-08-01 00:00:00
abstract:BACKGROUND:Pigmentations of the oral cavity are commonly noted in clinical practice and may have physiologic, non-physiologic, or pathologic etiologies. The most common non-physiologic localized pigmentation is the amalgam tattoo; another, less common, non-physiologic pigmentation is the graphite tattoo. Graphite tatto...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.2005.76.9.1572
更新日期:2005-09-01 00:00:00
abstract::Interproximal bony defects were treated with either porous hydroxyapatite (PHA) or decalcified freeze-dried bone allograft (DFDB) implants at two different clinical centers. Twelve paired defects in 12 patients were treated at each center. Six months post-surgically the defects were measured to assess changes from the...
journal_title:Journal of periodontology
pub_type: 临床试验,杂志文章
doi:10.1902/jop.1990.61.7.399
更新日期:1990-07-01 00:00:00
abstract::Fourteen defects were treated with flap debridement procedures using the Prichard principle of epithelial exclusion. Six defects were considered to be medium in width (3-4 mm), seven defects were wide (greater than 4 mm), and one defect was narrow (1-2 mm). The parameters studied were changes in gingival and plaque sc...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1986.57.5.277
更新日期:1986-05-01 00:00:00
abstract::Patient plaque removal is a major component of periodontal therapy and should be continuously monitored during and following treatment. There do not appear to be studies which address plaque score changes achieved primarily by patient performance from the time of initial presentation to, during, and following active t...
journal_title:Journal of periodontology
pub_type: 杂志文章
doi:10.1902/jop.1990.61.6.343
更新日期:1990-06-01 00:00:00