ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00305.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Ceramic orthodontic brackets were developed for the purpose of esthetics and increased tooth‐to‐bracket strength. An alternative method of preparing a rest seat on the lingual surface of lower canine teeth without violating the entemel integrity is offered. Ceramic orthodontic brackets were bonded to the lingual surfaces of mandibular canines and shaped into rest seats using diamond burs. Because the rest seats are not cut into the tooth structure, sensitivity and potential caries complications are avoided. The bracket is adhered to the tooth surface with a dimethacrylate bonding material. The brackets are bonded with either a no‐mix or a two‐part adhesive system. The strength of this bond will easily support the forces of a partial denture framework. The advantage over metal acid–etched retained rests is that this method avoids a time‐consuming laboratory step. The greatest advantage over the use of composite resins that are shaped into rest seats is the much higher bond strength. After ceramic brackets were bonded to the lingual surfaces of mandibular canines and shaped into rest seats, an impression was obtained for the fabrication of a conventional partial dentur

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00306.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Unilateral osseous reconstruction of a dentate mandible after tumor ablation may be restored with implants and a removable partial denture. Often the remaining dentition is in a “straight line” that does not allow cross‐arch stabilization of the framework. Framework design incorporating existing unilateral lingual or buccal retention in the natural dentition and unilateral implant attachments affords a stable, retentive definitive prosthesis for this patient popul

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00307.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeThis investigation introduces percent adherent area and 10‐minute and 8‐hour peelstrength values as an in vivo evaluation of three popular maxillofacial prosthetic adhesives when used with three extraoral prosthetic polymers.Materials and MethodsSpecimens of Silastic MDX 4‐4210, Silastic Medical Ahesive A (Dow Corning Corporation, Midland, MI), and Silicone A‐2186 (Factor II, Inc, Lakeside, AZ) were adhered to 25 subjects' arms using Secure Medical Adhesive (Factor II, Inc), Pros‐Aide Adhesive (ADM Tronics Inc, Northvale, NJ), and Hollister Colostomy Adhesive (Hollister Inc, Libertyville, IL). After 10 minutes, the peel strength required to remove the specimens was measured. Additional specimens were then adhered to the subjects and worn for 8 hours. The nonadherent areas of the specimens were then marked, the peel strength was measured again, and then the percent adherent area was calculated.ResultsHollister Colostomy Adhesive showed greater 10‐minute peel‐strength values when used with Silastic Medical Adhesive A. The peel‐strength values of the Hollister Colostomy Adhesive when used with Silastic MDX 4‐4210 increased with time. The greatest percent adherent area was obtained with Silastic MDX 4‐4210 using Pros‐Aide Adhesive, and the lowest was obtained with Pros‐Aide Adhesive using Silicone A‐2186 and Silastic Medical Adhesive A.ConclusionsThere was no clearly superior adhesive/prosthetic material combination based on the tests used in this study; however, individual skin variations between patients affec

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00308.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeThis study evaluated the bond strength and bond durability of new adhesive systems to pure titanium.Materials and MethodsPlexiglass tubes filled with composite were bonded to titanium discs. Groups of 24 samples were bonded using six different bonding systems. Subgroups of eight bonded samples were stored in an isotonic artificial saliva solution (37°C) for 1, 30, or 150 days. In addition, the 30‐ and 150‐day samples were thermal cycled for 7,500 or 37,500 cycles between 5°C and 55°C, respectively. After these storage conditions, all samples were debonded in tension.ResultsThe bond strength of a conventional bisphenol‐A glycidyl methacrylate composite to sandblasted titanium was significantly lower than using chemomechanical bonding systems and decreased slightly during the storage time of 150 days. The additional use of a silane on sandblasted titanium resulted in an insignificant increase in bond strength and decreased over storage time to the same level as on sandblasted‐only titanium. Statistically significant higher bond strengths were achieved either with the combination of silica coating and use of a conventional bisphenol‐A glycidyl methacrylate composite or with the combination of sandblasting and the use of composites modified with a phosphate monomer. In the latter systems, the bond strengths were only limited by the cohesive strength of the composite resins. A new phosphate monomer containing composite showed a tendency to lose cohesive strength over time (statistically not significant).ConclusionsUsing chemomechanical bonding systems, ie, silica‐coating systems or modified composites with adhesive monomers, resulted in 2 to 2.5 times increased bond strength to titanium compared with the bond strength of a conventional bisphenol‐A glycidyl methacrylate composite. With chemomechanical bonding systems, the resin bond to titanium was durable over 150 days, even after being stored in water an

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00309.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeThe maximum preload torque of implant prosthetic retaining screws from four manufacturers and of two alloy types was measured to determine one index of interchangeability of intersystem components.Materials and MethodsImplant prosthetic retaining screws from four manufacturers (3i Implant Innovations Inc, West Palm Beach, FL; Impla‐Med Inc, Sunrise, FL; Nobelpharma USA Inc, Chicago, IL; and Implant Support Systems Inc, Irvine, CA) and of two metal types (gold and titanium) were investigated using an in vitro simulation model. Five screws of each type were tightened down against a gold cylinder using a Tohnichi BTG‐6 torque gauge (Tohnichi American Corporation, Northbrook, IL) until fracture occurred.ResultsThe 3i Implant Innovations gold and the Nobelpharma gold were not significantly different. The 3i Implant Innovations titanium and the Impla‐Med gold were able to withstand less preload torque than the 3i Implant Innovations gold and the Nobelpharma gold. The Implant Support Systems titanium was able to withstand significantly more preload torque than all of the other screws.ConclusionsInterchanging implant prosthetic retaining screws could introduce new and unknown variables that may affect the long‐term survival of implant fixtures and/or the implant pro

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00310.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeThe purpose of this in vitro study was to evaluate the bond strengths of a bonding agent and composite resin system to human enamel and dentin treated with five contaminants (saliva, plasma, zinc oxide–eugenol cement, noneugenol zinc oxide cement, and handpiece lubricant) using air, moisture, and water as controls.Materials and MethodsA commercial bonding agent (Gluma 2000; Bayer AG, Dormagen, Germany) and its composite (Pekafill; Bayer AG) were applied to tooth structure under two conditions (contaminated and re‐etched). Samples were debonded in tension after 24 hours using an inverted, truncated cone bond test.ResultsAmong the controls, the highest bond strengths were obtained to enamel (20 MPa) and dentin (12 MPa) with air drying. Contaminants lowered the bond strength by 20% to 100%. Re‐etching without additional mechanical preparation resulted in bond strengths similar to the air control.ConclusionsBond strength of Gluma 2000/Pekafill to tooth structure is sensitive to common forms of contamination but can be improved by re‐etching after contamination

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00311.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeThis study determined the fracture toughness of four core buildup materials.Materials and MethodsSingle‐edge notch, bar‐shaped specimens conforming to the American Society for Testing Materials standard E‐399 were fabricated for a high copper amalgam alloy, two composite resins, and a glass ionomer buildup material. The specimens were stored in air for 1 week and then tested in three‐point bending mode with an Instron Universal Testing Machine (Instron Corporation, Canton, MA).ResultsFracture toughness values obtained were as follows: Fluorocore (composite resin; Caulk, Milford, DE), 1.54 MN · m−1.5; Ti‐Core (composite resin and titanium; Essential Dental Systems, New York, NY), 1.34 MN · m−1.5; Valiant Ph.D. (amalgam; Caulk), 1.29 MN · m−1.5; and Coreshade Glass lonomer Base Cement (Shofu Inc, Kyota, Japan), 0.55 MN · m−1.5.ConclusionsGlass ionomer materials are probably unsuitable as core buildup materials because of their relatively low fracture toughness. Fluorocore, Ti‐Core, and amalgam all had fracture toughness values significantly greater than th

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00312.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

PurposeAlthough numerous advances in maxillofacial materials have been made in the past several years, the need for improvement continues. Currently, the most widely used materials are the silicones, especially the room temperature‐vulcanizing type. This study compared the physical properties of a new silicone material Cosmesil K10 (Cosmedica Ltd, Cardiff, United Kingdom) with those of MDX4‐4210 (Dow Corning Corporation, Midland, Ml), a popular material for maxillofacial prostheses.Materials and MethodsThe properties that were investigated were tensile strength, modulus at 100% elongation, percentage of elongation, tear strength, and hardness. The properties tested were selected because of their clinical significance for fabricating maxillofacial prostheses. Tensile strength and elongation were measured with a Monsanto Tensometer (Monsanto Ltd, Swindon, England) and dumbbell‐shaped specimens according to the International Organization for Standardization (ISO) specification no. 37. The tear test was performed on the Monsanto machine with unnicked 9° angle–shaped specimen following the ISO specification no. 34. The type A Shore durometer was used to measure hardness on specimens 25 × 25 × 10 mm according to the American Society for Testing Materials specification no. D2240.ResultsThe results showed that MDX4‐4210 had a greater tensile strength and modulus (P= .0002;P= .0015). No significant difference (P= .1986) was found for the percentage of elongation between MDX4‐4210 and Cosmesil K10. Cosmesil K10 had a greater tear strength and was slightly harder (P= .0022;P= .0421) than MDX4‐4210.ConclusionsCosmesil K10 showed physical properties similar to those of MDX4‐4210. An improvement in the predictability of the mechanical behavior of Cosmesil K10 would further enhance the val

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00313.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Current computer systems improve the health professional's ability to store, retrieve, and present visual data in a way never before possible. Health professionals in general are beginning to use computer‐based digital imaging to improve the diagnosis and treatment planning of disease processes. The use of computer‐based networks to transmit medical and dental data is in its infancy but promises to be the main form of data transmission of the future. This article outlines a few applications presently being used and developed at the Ohio State University College of Dentistry in the preclinical and clinical courses in prosthodont

ISSN:1059-941X    

DOI:10.1111/j.1532-849X.1995.tb00314.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY