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Seventh generation resins

Chai-Lin Kao, Adela Ya-Ting Huang, Hui-Ting Chen
Here, this study overcomes the current barriers to efficient solid-phase synthesis of high-generation dendrimers by decreasing the loading ratio on the resin. G7 inverse poly(amidoamine) dendrimer is now prepared, for the first time, through a solid-phase synthesis using only 50% of the available reactive sites and by choosing a large resin. This preparation takes only 15 d to afford highly pure product in 80% yield with precipitation being the only purification procedure used. The results clearly show the amount of the initial monomer loaded on the resin to be a vital factor for the ability to use solid-phase synthesis to produce large dendrimers...
June 2017: Macromolecular Rapid Communications
Kengo Akagawa, Junichi Satou, Kazuaki Kudo
By screening large-scale N-terminal l-prolyl peptide libraries, we explored efficient catalysts for asymmetric Michael addition of a malonate to an enal. The catalytically active peptides obtained by the screening could be categorized into two groups based on the similarity of amino acid sequences. One group of the peptides selectively gave an S-product, whereas the other gave an R-product, despite all of the peptides having a common N-terminal sequence, Pro-d-Pro. Further optimization by second-generation screenings afforded more reactive and enantioselective catalysts...
October 7, 2016: Journal of Organic Chemistry
R Veena Kumari, Kishore Siddaraju, Hema Nagaraj, Ramya Krishna Poluri
BACKGROUND: The purpose of this study was to compare the shear bond strength of nanocomposite resin to superficial dentin and deep dentin using two different dentin bonding systems. MATERIALS AND METHODS: All teeth were sectioned at various levels (superficial dentin: Dentin within 0.5-1 mm of dentinoenamel junction; deep dentin: Dentin within 0.5 mm of the highest pulp horn) using a Carborundum Disc and embedded in acrylic block of specific size. Selected specimens (60 premolar teeth) were grouped randomly into three groups, the groups were differentiated into superficial dentin, deep dentin, and control group which were further divided into sub Group A and Subgroup B containing 10 teeth each, depending on the bonding agents used...
September 2015: Journal of International Oral Health: JIOH
Mahesh K Duddu, Radhika Muppa, Priyanka Panthula, N Ch Srinivas
PURPOSE: The study was conducted with the aim of comparing the shear bond strength (SBS) and microleakage of Tetric N-Bond, G-bond, and Xeno V (seventh generation dentin adhesives) in primary anterior teeth. MATERIALS AND METHODS: For the shear bond strength, 45 teeth were randomly divided in to three groups namely group A, B, C (n = 15). Samples were mounted horizontally on acrylic block exposing the facial surface and bonded with different adhesives according to manufacturer instructions...
April 2015: Journal of the Indian Society of Pedodontics and Preventive Dentistry
Sathish Abraham, Wasudeo Namdeo Ghonmode, K P Saujanya, Neha Jaju, Varsha H Tambe, Priya P Yawalikar
BACKGROUND: The objective of this in-vitro study was to evaluate the effect of grape seed extract (oligomericproanthocyanidin complexes [OPCs]) on the bond strength of composite resin to bleached enamel using 5th and 7th generations of bonding agents. MATERIALS & METHODS: Eighty maxillary central incisors were randomly assigned to four groups as follows: Group I (n=20): no bleaching (control); Group II (n=20): bleaching with 38% hydrogen peroxide gel, without the use of an antioxidant; Group III (n=20): bleaching followed by the use of 10% sodium ascorbate; Group IV (n=20) : bleaching followed by the use of 5% proanthocyanidin solution...
December 2013: Journal of International Oral Health: JIOH
Xiang Pu, Xixing Qu, Fei Chen, Jinku Bao, Guolin Zhang, Yinggang Luo
Camptothecin (CPT), the third largest anticancer drug, is produced mainly by Camptotheca acuminata and Nothapodytes foetida. CPT itself is the starting material for clinical CPT-type drugs, but the plant-derived CPT cannot support the heavy demand from the global market. Research efforts have been made to identify novel sources for CPT. In this study, three CPT-producing endophytic fungi, Aspergillus sp. LY341, Aspergillus sp. LY355, and Trichoderma atroviride LY357, were isolated and identified from C. acuminata...
November 2013: Applied Microbiology and Biotechnology
M R Meharry, S M Moazzami, Y Li
OBJECTIVE: Durability is still a major challenge in adhesive dentistry. One of the biggest areas of development has been to simplify the bonding process by using all-in-one adhesives. The aim of this study was to compare the shear bond strength (SBS) to dentin and enamel of nine dental bonding agents (DBAs) from three generations after simulated aging. METHODS AND MATERIALS: For this study, 108 sound extracted human molars were randomly assigned to nine groups (n=12)...
November 2013: Operative Dentistry
Bruhvi Poptani, K S Gohil, Jaishree Ganjiwale, Manisha Shukla
OBJECTIVES: The objective of this in vitro study was to compare the microtensile dentin bond strength (μTBS) of five seventh-generation dentin bonding agents (DBA) with fifth-generation DBA before and after thermocycling. MATERIALS AND METHODS: Ten extracted teeth were assigned to fifth generation control group (optibond solo) and each of the five experimental groups namely, Group I (G-Bond) ,Group II (S(3) Clearfil), Group III (One Coat 7.0), Group IV (Xeno V), and Group V (Optibond all in one)...
September 2012: Contemporary Clinical Dentistry
Geoffrey Gonzalez, Alfred P Rich, Matthew D Finkelman, Catherine Defuria
This controlled, randomized, in vitro study evaluated the shear bond strength of several seventh generation bonding agents on the dentin of primary teeth. Six different adhesives were used: Xeno IV, Clearfil S3 Bond, Adper Prompt-L-Pop, AdheSE One, Bond Force, and Optibond (control). Ninety primary teeth were prepared by wet grinding with a 320-grit silicon carbide paper on a polishing wheel running at 110 RPM. After 24 hours of storage in water, shear bond strengths of each group were determined. The mean shear bond strength of the tested adhesive systems to primary dentin was 12...
January 2012: General Dentistry
Andy C S Ho, Sercan Akyalcin, Tammy Bonstein, Williama A Wiltshire
OBJECTIVE: The purpose of this study was to evaluate the in vitro shearing force performance of orthodontic attachments using two self-etching primers (SEPs): iBOND and G-Bond. DESIGN: In vitro, laboratory study. MATERIAL AND METHODS: One hundred and eighty human molars were randomly divided into four groups and again into three sub-groups with 15 teeth each. Teeth were bonded with a stainless steel button (GAC International,Bohemia, NY, USA) using Transbond XT adhesive composite...
December 2011: Journal of Orthodontics
S Vinay, Vasundhara Shivanna
OBJECTIVES: The purpose of this study was to determine the microleakage in the 5(th) and 6(th) generation bonding agents with that compared with the newly introduced 7(th) generation bonding agents using three bonding agents. MATERIALS AND METHODS: A total of 50 recently extracted human upper premolars were subjected to the study. Class V cavity preparations were prepared on the buccal and lingual surfaces of the extracted premolars with occlusal margins in the enamel and gingival margins in the cementum/dentin...
July 2010: Journal of Conservative Dentistry: JCD
Matheus Melo Pithon, Rogerio Lacerda dos Santos, Antônio Carlos de Oliveira Ruellas, Eduardo Franzotti Sant'Anna
The purpose of this study was to compare the bond strengths and to evaluate the debonding site using the adhesive remnant index (ARI) provided by a conventional acid-etch conditioner and a new self-etching adhesive system, Xeno IV (Dentsply Caulk). One hundred and eighty bovine lower incisors were randomly divided into six groups (n = 30). In groups 1, 2, and 3, Transbond XT (3M Unitek) composite was used to bond the brackets to enamel samples conditioned with 37 per cent phosphoric acid + XT primer (3M Unitek), Xeno IV + XT primer, or Xeno IV only, respectively...
October 2010: European Journal of Orthodontics
Syed M Yaseen, V V Subba Reddy
AIM: The present study was undertaken to compare and evaluate shear bond strength of two self-etching adhesives (sixth and seventh generation) on dentin of primary and permanent teeth. MATERIALS AND METHODS: Flat dentin surface of 64 human anterior teeth (32 primary and 32 permanent) divided into four groups of 16 each. Groups A and C were treated with Contax (sixth generation), while groups B and D were treated with Clearfil S3 (seventh generation). A teflon mold was used to build the composite (Filtek Z-350) cylinders on the dentinal surface of all the specimens...
January 2009: Journal of the Indian Society of Pedodontics and Preventive Dentistry
Barry M Owens, William W Johnson
This in vitro study evaluated the coronal and apical marginal microleakage of four self-etch, seventh generation adhesive systems. Sixty non-carious human molars were randomly assigned to four groups (n = 12). Class V cavities were prepared on the facial or lingual surface of each tooth with coronal margins in enamel and apical margins in cementum (dentin) at the cementoenamel junction. The preparations were restored using four self-etch adhesive systems (iBond, G-Bond, Xeno IV and Clearfil S3 Bond) and a control (no adhesive), followed by insertion of Gradia Direct microfilled hybrid resin composite...
January 2007: Operative Dentistry
Randy Weiner
No abstract text is available yet for this article.
October 2005: Dentistry Today
Michael DiCicco, Ryan Compton, Susan A Jansen-Varnum
Hydroxyl radical (*OH)-induced inflammation is a primary mode for in vivo cytotoxicity. A legitimate concern is whether particulate wear debris from orthopedic composites can stimulate inflammation via ferrous ion (Fe2+)-mediated production of *OH. The purpose of this research was to utilize electron paramagnetic resonance (EPR) spin trapping in investigating and comparing the potential for postsurgical cytotoxicity induced specifically by *OH in the presence of two composites: Simplex P and the novel, hybrid, CORTOSS...
January 15, 2005: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
John M Powers, Kathy L O'Keefe, Lilliam M Pinzon
Four generations of total-etch (fourth, fifth) and self-etching (sixth, seventh) bonding agents for use with resin composites are commercially available in the United States. Innovations in bonding agents include: filled systems, release of fluoride and other agents, unit dose, self-cured catalyst, option of etching with either phosphoric acid or self-etching primer, and pH indicators. Factors that can affect in vitro bond strength to human dentin include substrate (superficial dentin, deep dentin; permanent versus primary teeth; artificial carious dentin), phosphoric acid versus acidic primers, preparation by air abrasion and laser, moisture, contaminants, desensitizing agents, astringents, and self-cured restorative materials...
September 2003: Odontology
James R Dunn
Dental adhesive systems used for bonding dental resins to enamel and dentin have evolved through several "generations," with changes in chemistries, mechanism, number of bottles, application technique, and clinical effectiveness. The trend in the latest generation of dental bonding systems is to reduce the number of components and clinical placement steps. The introduction of iBond, a single-bottle dental adhesive system, is the latest of the new generation materials, and combines etchant, adhesive, and desensitizer in one component...
February 2003: Compendium of Continuing Education in Dentistry
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