Abstract：
OBJECTIVES:Whitening efficacy has been related to hydrogen peroxide (HP) diffusion into tooth structure. However, little information is available relating rheological properties to whitening efficacy. The purpose was to evaluate the whitening efficacy and HP penetration level of a 10% HP gel at three different viscosities and to compare them to a strip delivery system. METHODS AND MATERIALS:Extracted molars (n=120) were randomly assigned into five groups (n=24/ group): NC_MED (negative control; median): medium viscosity gel without HP; LOW: 10% HP gel (low viscosity experimental gel, Ultradent Products Inc); MED: 10% HP gel (medium viscosity experimental gel, Ultradent); HIGH: 10% HP gel (high viscosity gel, Ultradent); and CWS: Crest 3D Whitestrips 1-Hour Express (Procter & Gamble). All teeth were subjected to five 60-minute whitening sessions. Instrumental color measurements were performed at baseline (T0), and 1-day after each application (T1-T5), and 1-month after whitening (T6). HP penetration was estimated with leucocrystal violet and horseradish peroxidase. A Kruskal-Wallis test and post hoc Bonferroni test were performed to assess the difference in tooth color change and HP penetration among the groups (α=0.05). RESULTS:Hydrogen peroxide penetration levels and overall color changes at T6 were 0.24 μg/mL / 2.80; 0.48 μg/mL / 8.48; 0.44 μg/mL / 7.72; 0.35 μg/mL / 8.49; 0.36 μg/mL / 7.30 for groups NC, LOW, MED, HIGH, and CWS, respectively. There was a significant difference for HP penetration, while there was no significant difference among the four experimental groups for tooth color change. CONCLUSION:Rheological properties should be considered when developing new whitening formulations.
journal_name
Oper Dentjournal_title
Operative dentistryauthors
Kwon SR,Pallavi F,Shi Y,Oyoyo U,Mohraz A,Li Ydoi
10.2341/17-099-Lsubject
Has Abstractpub_date
2018-05-01 00:00:00pages
326-334issue
3eissn
0361-7734issn
1559-2863journal_volume
43pub_type
杂志文章,随机对照试验abstract：:This study determined the influence of light curing protocols and matrix type on the margin quality and marginal seal of Class II resin-based composite restorations. In extracted human molars, box-shaped MOD cavities with 1 mm wide interproximal bevels were prepared with cervical margins located at least 1 mm coronal ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/04-194
更新日期：2006-01-01 00:00:00
abstract：:This study evaluated the biocompatibility of contemporary bulk-fill resin-based composites (RBCs) including PRG (pre-reacted glass ionomer) materials based on the International Organization for Standardization 10993. In addition, the effect of composite thickness on cytotoxicity was also assessed. Two standard composi...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/15-059-L
更新日期：2015-11-01 00:00:00
abstract：:This study investigated the effect of three equivalent radiant exposure energy application sequences (EASs): high intensity power (HIP: 1,177 mW/cm2, 40 seconds), low intensity power (LOP: 573 mW/cm2, 71 seconds) and ramp (RMP: 650 mW/cm2, 5 seconds, then the irradiance increases to 1047 mW/cm2, 37 seconds) on the mic...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/06-30
更新日期：2007-03-01 00:00:00
abstract：OBJECTIVES:Inadequately polymerized resin cements may negatively affect the clinical performance of cemented all-ceramic restorations. The purpose of this in vitro study was to evaluate the effect of ceramic thickness and shade on the microhardness of various light-cured (LC) and dual-cured (DC) resin cements. The amou...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/10-206-L
更新日期：2011-11-01 00:00:00
abstract：:The reasons for placement and replacement and the longevity of amalgam restorations were recorded by 62 Italian private practitioners. The survey compiled 1935 amalgam restorations inserted due to primary caries (59%) and failed restorations (41%). The clinical diagnosis of secondary caries constituted 59% of failures...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：1992-03-01 00:00:00
abstract：:The molar proximal half-crown cast gold restoration may be an ideal choice for the conservative treatment of teeth with only one compromised proximal aspect. ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/10-T1
更新日期：2010-03-01 00:00:00
abstract：INTRODUCTION:Limited access to interdental spaces complicates removal of excess material when placing class II composite resin restorations. Evidence-based recommendations on interproximal finishing are rare. We present novel microscalpels for this indication. The aim of the study was to test their fracture strength an...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/16-012-L
更新日期：2017-05-01 00:00:00
abstract：:Bleaching-induced tooth sensitivity (TS) is highly prevalent. OBJECTIVE:This study aimed to determine if the combination of opioids and nonopioids analgesics (Tylex) may provide a better analgesic effect. METHOD:A triple-blind, parallel, randomized two-center clinical trial was conducted with 105 healthy patients wh...
journal_title：Operative dentistry
pub_type： 杂志文章,多中心研究,随机对照试验
doi：10.2341/17-092-C
更新日期：2018-03-01 00:00:00
abstract：:The aims of this study were to investigate 1) the influence of cleansing methods after saliva contamination and 2) aging conditions (thermocycling and water storage) on zirconia shear bond strength (SBS) with a resin cement. One hundred and eighty zirconia specimens were sandblasted with 50 μm aluminum oxide particles...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/13-323-L
更新日期：2015-03-01 00:00:00
abstract：:This study was designed to compare strength, elastic modulus (stiffness), and hardness for five composite resin materials that are used for laboratory-fabricated posterior composite restorations. Ten specimens of each material were processed according to the manufacturer's instructions. Statistical analysis indicated ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：1994-11-01 00:00:00
abstract：:This study compared the clinical performance of a polyacid-modified resin composite and a resin-modified glass-ionomer restorative material over two years. Thirty-four pairs of restorations of Compoglass and Fuji II LC were placed in caries-free cervical erosion/abfraction lesions without tooth preparation. Restoratio...
journal_title：Operative dentistry
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：2001-01-01 00:00:00
abstract：:One hundred cervical caries-free, nonundercut lesions were restored in 13 patients of mean age 60.5 years, using Silux Plus or Estio LC resin composite bonded with Fuji Bond LC. Patients were recalled at 6 months and 1 year. A 1-year cumulative retention rate of 98% was recorded, while marginal staining was absent. ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：1998-11-01 00:00:00
abstract：:This study evaluated the pulp biocompatability of a new light-cured composite resin which was placed in etched glass-ionomer-lined cavities of monkey teeth. The pulpal response to this material was less than that to zinc-oxide eugenol cement in each observation period. Therefore this material seems to meet acceptable ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：1991-07-01 00:00:00
abstract：:Amalgam has been used in the restoration of structurally compromised posterior teeth for many years. When placing large amalgam restorations, replacement of weak cusps with restorative material is recommended to prevent tooth fracture. This recommendation can be modified with new guidelines using modern adhesive techn...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/11-082-T
更新日期：2012-07-01 00:00:00
abstract：OBJECTIVES:To evaluate the effect of application protocol in resin-enamel microshear bond strength (μSBS), in situ degree of conversion, and etching pattern of three universal adhesive systems. METHODS AND MATERIALS:Sixty-three extracted third molars were sectioned in four parts (buccal, lingual, and proximals) and di...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/15-213-L
更新日期：2016-09-01 00:00:00
abstract：OBJECTIVES:It has been reported that bleaching generates an increase in the activity of osteoclasts in vitro. We quantified the RANK-L and IL-1β biomarkers in a double-blind, randomized clinical trial evaluating the in vivo effect of hydrogen peroxide (35%) and peroxide carbamide (37%) six months after whitening. METH...
journal_title：Operative dentistry
pub_type： 杂志文章,随机对照试验
doi：10.2341/18-023-C
更新日期：2019-11-01 00:00:00
abstract：:This study evaluated the effects of two in-office bleaching agents (Beyond and Opalescence Boost) with different pH on the structure and mechanical properties of human enamel in vitro and in situ. One hundred and eight enamel slabs were obtained from freshly extracted premolars. The specimens were randomly distributed...
journal_title：Operative dentistry
pub_type： 杂志文章,随机对照试验
doi：10.2341/11-173-L
更新日期：2013-01-01 00:00:00
abstract：:To evaluate the correlation between microtensile dentin bond strength (microTBS) and silver ion penetration, two total-etch 3-step and one self-etch 2-step system were investigated. OptiBond FL adhesive was applied to flat occlusal dentin on six non-carious human molars, and a resin composite "crown" was formed in 2 m...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：2003-01-01 00:00:00
abstract：CLINICAL RELEVANCE:New dual-cure bulk-fill composites show promise for uniform degree of conversion and microhardness throughout the entire depth of direct restorations. SUMMARY: ...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/19-074-L
更新日期：2020-07-01 00:00:00
abstract：OBJECTIVE:To study the interfacial ultra-morphology formed by "all-in-one" self-etch adhesives. METHODS:Forty-nine extracted molars were assigned to one of five all-in-one adhesives: Adper Prompt L-Pop (AP, 3M ESPE); Clearfil S3 Bond (S3, Kuraray); G-Bond (GB, GC America); iBond (iB, Heraeus Kulzer) and Xeno IV (XE, D...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/07-133
更新日期：2008-09-01 00:00:00
abstract：:This study compared the degree of marginal leakage of a compomer in Class V cavities of human primary molars prepared by a conventional dental bur and air abrasion with or without acid etching. Fifty-six non-carious extracted primary molars were randomly divided into four groups (n=14) to be prepared by four technique...
journal_title：Operative dentistry
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：2005-03-01 00:00:00
abstract：:Minimally invasive flowable composite Class I restorations are widely used. However, flowable composites are characterized by low filler contents, modified resin formulations, low moduli of elasticity, low viscosity, generally poor mechanical properties, and decreased long-term stability. The purpose of this study was...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/11-106-L
更新日期：2012-05-01 00:00:00
abstract：:Coronal fractures of posterior teeth are not rare in clinical practice. Most of the time they constitute a restorational problem for the clinician, since they usually end below the free gingival crest. Two hundred coronal fractures of posterior teeth were examined in this study, with respect to several factors. Some o...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：1989-01-01 00:00:00
abstract：OBJECTIVE:This study evaluated the differences in enamel color change, surface hardness, elastic modulus, and surface roughness between treatments with four bleaching gels containing carbamide peroxide (two at 10% and one each at 35%, and 45%) and two bleaching gels containing hydrogen peroxide (two at 40%). METHODS:E...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/15-010-L
更新日期：2016-01-01 00:00:00
abstract：PURPOSE:To investigate the effect of different light exposure times, shades, and thicknesses on the depth of cure (DOC) of bulk fill composites. METHODS AND MATERIALS:Two bulk fill composites, Tetric EvoCeram Bulk Fill (TBF) and Sonic Fill (SF), and a conventional composite, Filtek Supreme Ultra (FSU), were evaluated....
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/16-057-L
更新日期：2017-09-01 00:00:00
abstract：:This article reviews the literature concerning the pulpal effects of composite resin restorations. A number of aspects are addressed, including the composite resin materials themselves, bacterial leakage, acid-etch technique, and dentin bonding procedures. Guidelines for pulpal protection are discussed. ...
journal_title：Operative dentistry
pub_type： 杂志文章,评审
doi：
更新日期：1989-01-01 00:00:00
abstract：:This study evaluated the cytotoxicity of four single component dentin bonding agents: Syntac Single Component, Prime & Bond 2.1, Single Bond and One Up Bond F. The test materials were applied on dentin discs of dentin barrier models in the same way as in the clinical procedures recommended by each manufacturer. Cell v...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：
更新日期：2003-07-01 00:00:00
abstract：AIMS:To evaluate the effect of two composite restorative techniques (direct bulk fill vs indirect CAD/CAM) on the fracture resistance and mode of fracture of extended mesio-occlusal-distal (MOD) cavity preparations. METHODS:Fifty-one sound human mandibular third molars were divided into three groups (n=17). Extended b...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/18-013-L
更新日期：2019-05-01 00:00:00
abstract：:Detailed and accurate impressions are made when the oral environment is dry during the impression process. Maintaining a dry field on medically, physically, or emotionally compromised patients can be very challenging. If not achieved, it may compromise dental care and accurate outcomes. This article describes a techni...
journal_title：Operative dentistry
pub_type： 杂志文章
doi：10.2341/11-290-T
更新日期：2014-01-01 00:00:00
abstract：:One hundred non-carious, non-undercut cervical lesions were restored with Silux Plus or Estio LC and bonded with Fuji Bond LC. The restorations were evaluated yearly for retention and marginal discoloration. After five years, the overall retention rate was 96%. Of the 41 restorations examined at five years, five had c...
journal_title：Operative dentistry
pub_type： 临床试验,杂志文章
doi：
更新日期：2002-09-01 00:00:00
