Visible Light-cured Resin Research Articles

Clinical applications of visible light-cured resin in maxillofacial prosthetics. Part I: Denture base and reline material

A visible light-cured resin system enables the dentist to accomplish chairside relining of removable prostheses. The material is pliable and can be initially cured in the mouth with the regular hand-held visible light. A special unit is needed to completely cure the material, which thereafter is comparable in quality to heatpolymerized acrylic resin. The value of this system for the practice of maxillofacial prosthetics is demonstrated by the ease of relining of various devices and obturator prostheses.

光重合型コンポジットレジンの開発に関する研究 ー シクロホスファゼン系モノマーに混合するフィラーの種類およびその量と物性について ー

光重合型コンポジットレジンの開発に関する研究 ー シクロホスファゼン系モノマーに混合するフィラーの種類およびその量と物性について ー

The bond strength of a visible light-cured reline resin to acrylic resin denture base material

The introduction of Triad visible light-cured denture resin has led to several applications. Among them is direct intraoral relining of complete and partial dentures. This study investigated the bonding characteristics of Triad reline resin to four commonly used heat-cured denture base resins. The shear and tensile bond strengths of Triad resin and four denture base resins were determined and compared with intact tensile strengths. The findings of this study indicate that the bond strength of Triad resin to denture base resin is sufficiently high to suggest its clinical applicability.

Durability of commercial composite resin. Chronological change in transverse strength and transverse elastic modulus of composite resin immersed in MeOH

The durability of visible light-cured composite resin was examined. Five kinds of commercial redox type composite resin and 7 kinds of visible light-cured composite resin were used and their base monomers were analyzed by HPLC. After the set products were immersed in MeOH, transverse strength and transverse elastic modulus were measured. Furthermore, the MeOH sorption, solubility in MeOH and main soluble component were examined. The main component of the base monomer in all 5 kinds of redox type was Bis-GMA. Seven kinds of visible light-cured composite resin consisted of 4 kinds of Bis-GMA (including BMPEPP) and 3 kinds of UDMA. Both cases of redox type and visible light-cured type of composite resin, when they were immersed in MeOH, transverse strength and transverse elastic modulus decreased. In the case of redox type (Clearfil posterior new bond), the decrease of transverse strength and transverse elastic modulus was small, that is, its base monomer was Bis-GMA, and large quantities of hybrid type filler were mixed. In the case of redox type, transverse strength and transverse elastic modulus showed a tendency to decrease with the increase of MeOH sorption. Solubility of 12 kinds of these composite resins was 0.25-4.78% and its main component in Pyrofil light bond A was BMPEPP, the residual were coincident with the main component of base monomer.

Mechanical properties and cure depth of UDMA-based composite resins

Mechanical properties and cure depth of visible light-cured composite resins based on six types of UDMA (IP-HEMA, IP-HPMA, XY-HPMA, MC-HPMA, UEDMA and UPDMA) monomers were investigated. Under wet conditions, the mechanical properties of the composite resins based on aliphatic UDMA (UEDMA and UPDMA) monomers were inferior to those based on the other UDMA monomers containing aromatic or cyclohexane rings in their chemical structures. The cure depth for these UDMA-based composite resins increased with increasing irradiation time. The composite resin based on the XY-HPMA monomer showed a cure depth and transmission coefficient superior to the other composite resins.

Soft palate obturator prosthesis made with visible light-cured resin

A technique is described using a visible light-cured resin system for the fabrication of a soft palate obturator prosthesis. This method is easy to use and saves time for both the patient and maxillofacial prosthodontist by eliminating some laboratory procedures.

An in vitro evaluation of a visible light-cured resin as an alternative to conventional resin bonding systems

An in vitro study of 69 premolars was conducted to evaluate a visible light-cured resin system used in orthodontic bonding. The material was evaluated under various parameters to determine its relative value as an alternative to the conventional chemically activated resin systems. The 30-hour bond strength for the visible light-cured resin system was approximately one half of that found for a chemically cured resin system. Initial 1-hour bond strength of the visible light-cured resin system was found to be only 26% of the 30-hour bond strength. Enamel loss associated with debonding and subsequent cleanup of the visible light-cured resin was approximately one half of that found with the chemically cured, heavily filled resin. With the visible light-cured resin system, cleanup of remaining resin required the use of hand scalers only.

Shear bond strength of visible-light-cured resin relative to heat-cured resin

One promising clinical application of visible-light-cured (VLC) denture resin is for relining complete and partial dentures. Typically, a VLC resin would be used to reline an existing prosthesis fabricated from heat-cured resin (HCR). This study measured the shear bond strength of a VLC resin bonded to HCR specimens by different bonding agents. For comparison, we measured the shear bond strengths of VLC resin bonded to VLC resin specimens and of autopolymerizing resin (APR) to HCR specimens. Cylindrical specimens of HCR (n = 126) and VLC (n = 24) were thermocycled to simulate aging, and the bonding surfaces were prepared by being sanded to approximate clinical roughness. The specimens were divided into seven groups of approximately 20 each, and test materials were bonded by different bonding agents. Statistical analysis by ANOVA and the Student-Newman-Keuls test showed significant differences (p < 0.05) among all groups except APR to HCR/no bonding agent, VLC to HCR/VLC bonding agent, or VLC to HCR/VLC and HCR bonding agent. The traditional bond of APR to HCR with HCR bonding agent was significantly stronger (p < 0.05) than the strongest bond of VLC to HCR with HCR and VLC bonding agents.

Light-cured hollow obturators

Obturators used in the rehabilitation of large defects of the upper jaw should be easily made to produce a comfortable and stable prosthesis. This goal has been difficult to achieve by using traditional materials and techniques. This article describes a technique to overcome these problems by using a visible light-cured resin. Results indicate that resultant obturators are easily and quickly constructed, and provide a light, comfortable, and well-tolerated prosthesis.

Visible light-cured denture resin used in making dentures with conventional teeth

A visible light-cured denture base can be made to serve as a custom record base and as the final denture base. After individual conventional denture teeth are set in wax, a matrix can be made to hold the teeth in relation to the denture base and cast after the wax is removed and during the time the light-cured resin is being added and partially cured. When the matrix is removed, additional light-cured resin can be added to establish the denture contours and the denture can be processed without flasking.

Dimensional changes at the posterior border of baseplates made from a visible light-activated composite resin

Dimensional changes of 50 baseplates made of Triad visible light-cured resin were measured before and after curing, placement in water, and drying on the laboratory bench. Results showed that the resin shrinks but improves on storage in water. For persons sensitized to monomer, no free monomer is present in the material. Therefore, Triad resin offers an alternative to conventional self-curing resins often used to make baseplates.

Evaluation of the viscoelastic behavior of a light-cured denture resin

A visible light-cured reline resin presently marketed is used directly in the mouth to record the tissue. The viscosity of the material will therefore have an effect on the success of the reline. This article compares the viscoelastic properties of the currently marketed visible light-cured material with a medium-body rubber base material. A cone and plate viscometer was used to help derive the apparent viscosity and flow index of the materials. Readings were recorded with varying shear rates at 25 degrees C and 37 degrees C. The visible light-cured resin was found to have a higher apparent viscosity and flow index than the medium-body rubber base at low shear rates. Temperature had an indirect relationship with the viscosity.

Marginal sealing of visible light-cured composite resins in cervical cavities : Hotta Masato (1988) Jap. J. Conserv. Dent.31, 1371–1388

Marginal sealing of visible light-cured composite resins in cervical cavities : Hotta Masato (1988) Jap. J. Conserv. Dent.31, 1371–1388

Dynamic mechanical properties of an inlay composite

A visible light-cured composite resin (Brilliant DI) has been studied over a wide range of temperature and frequency by a dynamic mechanical flexural method. The derived data of logarithmic modulus and loss tangent (tan δ) show considerable changes following a secondary-cure process applied to the material. This involved the application of heat and intense light with temperatures rising to 120°C in 7 min. Following this oven-cure the resin phase exhibited enhanced stiffness with the activation-energy barrier for molecular motion at the glass-transition rising from 220 to 291 kJ/mol. This study clarifies the nature and extent of the internal molecular changes which may be produced in the fabrication of a composite inlay.

各種歯科材料の疲労に関する研究 Ｉ 合着用セメントおよび支台築造用コンポジットレジンの圧縮強さについて

In this study, we investigated compressive strength of various luting cements and composite resin cores in both dry and wet condition, and then influences of repeating load on compressive strength in wet condition of distilled water at 37 degrees C. As frequency of repeating load increased, compressive strength of all materials decreased. It means that the repeated load cycling test used in this study is adequate for evaluating durability of various dental materials. The results were as follows: 1. In the condition of no loading in both dry and wet condition, resin cement indicated the highest compressive strength of all cements examined and was followed by glass ionomer cement, zinc phosphate cement and polycarboxylate cement. Glass ionomer cement was notably influenced in wet condition. 2. After 10,000 cycles of loading in wet condition, resin cement indicated the highest compressive strength again and was followed by glass ionomer cement, polycarboxylate cement and zinc phosphate cement. In particular, compressive strength of zinc phosphate cement decreased remarkably. 3. In the condition of no loading, visible light-cured composite resin core was superior to chemical one. Visible light one was notably influenced in wet condition. 4. After 10,000 cycles of loading, visible light-cured composite resin core was superior to chemical one.

Radiographically detectable intraoral positional radiation stent

The views expressed herein are those of the authors and do not necessarily reflect the views of the United States Air Force or the Department of Defense. *Lieutenant Colonel, U.S. Air Force, D.C.; Fellow, Maxillofacial Prosthetics. **Colonel, U.S. Air Force, D.C.; Assistant Chairman for Maxillofacial Prosthetics. acrylic resin and are designed to accurately direct the external radiation source. Positional stents are used to move or displace tissues out of the field of radiation. This clinical report outlines a technique used in the fabrication of a radiographically detectable intraoral positional radiation stent using a visible light-cured resin (Triad, Dentsply International Inc., York, Pa.). A 64-year-old white man was referred from radiation therapy for a radiation stent that would position the mandible and tongue out of the primary field of radiation. The patient had a 2 x 4 cm lesion of the soft palate extending from the uvula into the anterior right tonsillar pillar with central ulceration. A biopsy demonstrated invasive squamous

Effect of filler system on the mechanical properties of light-cured composite resins. II. Mechanical properties of visible light-cured composite resins with binary filler system

To improve the fracture resistance of the composite resin system under highly stressed conditions, a variable amount of microfiller was incorporated into the light-cured composite resins containing splinter-shaped silica filler. With the increasing the microfiller content (10-30 wt%) in the resin matrix, the elastic modulus, compressive proportional limit and compressive fracture strength of the composite resin were increased. The plastic deformation of the composite resins under compressive stress were decreased with increasing microfiller content. These findings suggested that the combination of a larger silica filler and microfiller would increase the compressive fracture resistance of the composite resin systems.

Establishment of a composite resin inlay technique. Part 1. The effects of various curing modes on mechanical properties of composite resins

The effects of the curing mode on mechanical properties of composite resins were examined. Four resins as inlay, and three chemically-cured and five visible light-cured restorative resins were employed. The resin specimens were prepared by three kinds of curing modes; regular setting (according to the manufacturer's instruction), subsequently added light and heat curing after regular setting, and subsequently added heat and pressure curing after regular setting. Knoop hardness, flexure strength, compressive strength, and diametral tensile strength were determined. All restorative composites were remarkably increased in knoop hardness number due to the subsequently added curing methods. Both subsequently added curing methods provided higher flexure strength to all restorative resins, and particularly in the chemically-cured resins the flexure strength provided by the subsequently added light and heat curing was higher than those by the subsequently added heat and pressure curing. Compressive strength and diametral tensile strength were slightly increased by the subsequently added curing methods with the restorative resins. No correlation was found between the filler distribution and the mechanical properties provided by the subsequently added curing methods. The subsequently added heat curing seems to be preferable for creating higher mechanical properties of resins. The IC-2 resin, experimentally designed for resin inlay, seems to be the most promising resin for inlay restoration, based on the mechanical properties, and further detailed laboratory and clinical researches are required.

A Study on Disintegration of Visible Light-cured Composite Resins Caused by Long-term Water Immersion

A Study on Disintegration of Visible Light-cured Composite Resins Caused by Long-term Water Immersion

The shear impact retentive strengths of four dentine bonding agents to human and bovine dentine

The purpose of this study was to determine the shear impact retentive strengths of four dentine bonding agents to human and bovine dentine. The bonding agents were used to attach a visible light-cured composite resin to extracted human and bovine teeth. The shear impact bond strength was determined using a hydraulic tester running at close to maximum chewing speed. Statistically significant differences in bond strength were found using the different dentine bonding agents. There were no significant differences in bond strengths between the dentine substrate species for each agent.