Journal of Prosthetic Dentistry

Enhancing the predictability of complex rehabilitation with a removable CAD/CAM-fabricated long-term provisional prosthesis: A clinical report

J.F. Güth, J.S. Almeida e Silva, F. Beuer F, D. Edelhoff — 2012-01-01

Implementing any definitive prosthetic treatment of the residual edentulous ridge involves several risks. The patient's expectations may not be completely fulfilled as such treatment procedures include major changes in function and esthetics. Innovative materials, such as high-density polymers based on a highly cross-linked polymethylmetacrylate (PMMA) or composite resin for CAD/CAM-manufacturing are an alternative treatment option. They enhance the predictability of complex rehabilitations, especially in situations where the prognosis of the residual ridge behavior over time is challenging. This article describes an innovative approach of an extended pretreatment phase by using intraoral scanning and CAD/CAM technology for the fabrication of a long-term provisional removable dental prosthesis made of high-density polymer.

Retrospective cohort study of the predictors of implant failure in the posterior maxilla

2012-01-01

Conrad HJ, Jung J, Barczak M, Basu S, Seong WJ. Int J Oral Maxillofac Implants 2011;26:154-62.

Management of interproximal soft tissue with a resin-bonded prosthesis after immediate implant placement: A clinical report

Erdem Ozdemir, Wei-Shao Lin, Selim Erkut — 2012-01-01

This report describes immediate implant placement after the extraction of a vertically fractured tooth. During the healing phase, a resin-bonded prosthesis was inserted as a provisional restoration. After the creation of the optimal emergence profile and papillae with the provisional restoration, the definitive metal ceramic crown was fabricated.

Comparison of the anatomic crown width/length ratios of unworn and worn maxillary teeth in Asian and white subjects

2012-01-01

Statement of problem: Various aspects of anatomic tooth dimensions have been examined in a number of studies where data are primarily based on the measurements obtained from white subjects. Additional factors such as ethnicity should be considered to produce a more comprehensive analysis. Purpose: The purpose of this study is to compare the anatomic crown dimensions of extracted maxillary teeth in Asian and white populations. Material and Methods: The width/length ratio (%) was calculated with standardized digital images of extracted maxillary anterior teeth from 157 Asian and 142 white subjects. Statistical analysis was performed to compare the 4 tooth groups (central incisiors, lateral incisiors, canines, and premolars) of the 2 ethnicities. The distribution of the outcome variables were examined for normality with the Kolmigorov-Smirnov test. Independent sample t tests were used to examine differences in outcomes in Asian and white subjects. Results: There was a significant difference (P<.05) in the width/length ratios of all maxillary anterior teeth in Asian and white subjects. In addition, there was a significant difference in the width of unworn central incisors and the length of worn lateral incisors and canines. Conclusions: Ethnicity influences width/length ratios for all 4 anterior maxillary teeth. Anterior maxillary teeth in Asian subjects appear to be more slender when compared with those in white subjects.

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2012-01-01

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The effect of multiple firings on the marginal integrity of pressable ceramic single crowns

Seok-Hwan Cho, William W. Nagy, John T. Goodman, Eric Solomon, Mari Koike — 2012-01-01

Statement of problem: The marginal adaptation of metal ceramic crowns is affected by firing cycles for veneering porcelain application. The effect of multiple firings on the marginal integrity of pressable ceramic core crowns is unknown. Purpose: The purpose of this in vitro study was to evaluate the effect of repeated firing cycles on the marginal discrepancy of veneered (layered) pressable ceramic anterior crowns with 2 different finish line configurations. Material and Methods: Forty pressable ceramic single anterior complete crowns were fabricated from 2 systems (IPS Empress Esthetic and IPS e.max Press) with 2 finish line designs (shoulder, chamfer) on epoxy resin dies. Specimens were divided into 4 groups of 10, and measurements were made after pressing (control) and after 5 veneer firing stages: 1) wash, 2) first incisal, 3) second incisal, 4) characterization and glazing, and 5) corrective. The change in vertical marginal discrepancy was measured with a light microscope at 4 locations: facial (F), mesial (M), lingual (L), and distal (D) surfaces. One-way ANOVA (α-=.05) was used to evaluate the marginal change. A Student-Newman-Keuls test was also used for comparison among the groups. Results: There were no significant changes in the vertical marginal integrity related to ceramic type and marginal location and their interactions. However, there was a significant marginal integrity change during the characterization and glazing firing stage. (P<.05) Conclusions: The marginal gap increased for both systems during veneer application and decreased during the characterization and glazing firing cycle. The total marginal fit change after 5 firings was 0.33 μm for IPS e.max Press, and 0.27 μm for IPS Empress Esthetic.

Three-year clinical outcomes of implant treatments provided at a predoctoral implant program

2012-01-01

Lee DJ, Harlow RE, Yuan JC, Sukotjo C, Knoernschild KL, Campbell SD. Int J Prosthodont 2011;24:71-6.

Influence of recasting different types of dental alloys on gingival fibroblast cytotoxicity

2012-01-01

Statement of problem: Surplus alloy from the initial casting is commonly reused with the addition of new alloy. This recasting procedure could affect the cytotoxicity of dental alloys. Purpose: The purpose of this in vitro study was to evaluate the effect of repeated casting of high-noble and base metal alloys on gingival fibroblast cytotoxicity. Material and Methods: Disk-shaped specimens (5 × 2 mm, n=60) of a high-noble (Au-Pt) and 2 base metal (Ni-Cr and Cr-Co, n=20) alloys were prepared with 100% new alloy and 50%, 65%, and 100% once recast alloy. The elemental composition of specimens was analyzed with X-ray energy-dispersive spectroscopy. Five specimens from each group were conditioned in saline with 3% fetal bovine serum albumin. The conditioning media were analyzed for elemental release with atomic absorption spectroscopy. Cytotoxic effects were assessed on human gingival fibroblast with a 3-(4.5-dimethylthiazol-2-yl)-2.5-diphenyl tetrazolium bromide (MTT) colorimetric assay. The data were analyzed with 1-way and 2-way ANOVA and Tukey's HSD multiple comparison test (α-=.05). Results: Elemental compositions of Co-Cr and Au-Pt alloys were significantly different among casting protocols. Elemental release of Co-Cr and Ni-Cr alloys was significantly different between new and recast specimens (P<.001). Nickel release increased with recast alloy addition. The 2-way ANOVA showed a significant effect of the casting procedure (P<.001) alloy group (P<.001) and their interaction for cytotoxicity (P<.001). The Ni-Cr alloy groups with 65% and 100% recast alloy had lower cellular activity than all other specimens (P<.001). Conclusions: The results of this study indicated that alloys containing nickel have increased cytotoxic effects and that composition of the alloys affected the cytotoxicity. Furthermore, recasting nickel-containing alloys with 65% surplus metal addition significantly increased the cytotoxic activity.

Availability of Journal Back Issues

2012-01-01

As a service to our subscribers, copies of back issues of The Journal of Prosthetic Dentistry for the preceding 5 years are maintained and are available for purchase from Elsevier, Inc until inventory is depleted. Please write to Elsevier, Inc, Subscription Customer Service, 6277 Sea Harbor Dr, Orlando, FL 32887, or call 800-654-2452 or 407-345-4000 for information on availability of particular issues and prices.

CAD/CAM fabricated complete dentures: concepts and clinical methods of obtaining required morphological data

2012-01-01

The clinical impression procedures described in this article provide a method of recording the morphology of the intaglio and cameo surfaces of complete denture bases and also identify muscular and phonetic locations for the prosthetic teeth. When the CAD/CAM technology for fabricating complete dentures becomes commercially available, it will be possible to scan the denture base morphology and tooth positions recorded with this technique and import those data into a virtual tooth arrangement program where teeth can be articulated and then export the data to a milling device for the fabrication of the complete dentures. A prototype 3-D tooth arrangement program is described in this article that serves as an example of the type of program than can be used to arrange prosthetic teeth virtually as part of the overall CAD/CAM fabrication of complete dentures.

Erratum

2012-01-01

Dr. Faysal Succaria is a new Diplomate of the American Board of Prosthodontics (ABP) effective February 2011, and should have been listed in the ABP Annual Report published in the December 2011 journal.

The influence of different registration techniques on condyle displacement and electromyographic activity in stomatognathically healthy subjects: A prospective study

Sabine S. Linsen, Helmut Stark, Azadeh Samai — 2012-01-01

Statement of problem: It is unclear whether different intermaxillary registration techniques are related to a physiological condylar position that permits neuromuscular equilibrium. Purpose: This study analyzes and quantifies the effects of different registration techniques on the condyle position and how the registration technique modulates bilateral masseter and anterior temporalis muscle electromyographic activity. Material and Methods: Three-dimensional electronic condylar position analysis (EPA) with an ultrasound-based jaw-tracking system and surface electromyographic activity (sEMG) was recorded during the registration of a manually guided centric relation (CR), maximal intercuspation (MI), and Gothic arch tracing guided centric relation (DIR method). Participants were 26 stomatognathically healthy volunteers (mean age, 30.6 ±9.5 years). Data were analyzed by 1-way ANOVA and post hoc Bonferroni correction (α=.05). Results: EPA showed significant differences (P<.001) for CR, MI, and DIR in the vertical, sagittal, and horizontal axes. The condyle position during DIR was found to be significantly more anteriorly and inferiorly located than with CR (P<.001) and MI (P<.04). There were no significant differences in the mean muscle activity among CR, MI, and DIR. Muscular symmetry ranged from 63.87 to 81.47%. Significantly higher symmetry for the anterior temporalis (P=.03) and the masseter (P=.03) was found during the DIR than with CR. Torque coefficients (potential laterodeviating effect) were between 88.02% (CR) and 89.94% (MI). Conclusions: Registration technique significantly influenced the condyle position, while mean muscular activity was minimally affected. With respect to muscular balance and activation, the DIR position proved to be capable of inducing the greatest motor unit activity when compared with manually guided CR and MI.

A retrospective analysis of 125 single molar crowns supported by two implants: Longterm follow-up from 3 to 12 years

2012-01-01

Wolfinger GJ, Balshi TJ, Wulc DA, Balshi SF. Int J Oral Maxillofac Implants 2011;24:71-6.

Use of transparent vinyl polysiloxane in a minimally invasive approach for creating composite resin undercuts for partial removable dental prostheses

Fabiana Mansur Varjão — 2012-01-01

A technique using a transparent vinyl polysiloxane material developed for use with light-polymerized composite resin and that does not require a lubricant is presented for creating composite resin undercuts for partial removable dental prosthesis clasps. With a surveyor, the undercut is waxed on the diagnostic cast according to the intended path of insertion. The transparent vinyl polysiloxane is used to fabricate a template for the undercut. The template is used intraorally to create the undercut in composite resin on the abutment tooth.

Trial insertion procedure for milled lithium disilicate restorations in the precrystallized state

Wei-Shao Lin, Bryan T. Harris, Dean Morton — 2012-01-01

A treatment protocol with lithium disilicate restorations and a computer-aided design and computer-aided manufacturing (CAD/CAM) fabrication process is proposed for the restoration of teeth in the esthetic zone. The technique involves trial insertion of restorations at the precrystallized stage, allowing verification of the marginal fit and evaluation of the internal adaptation and overall esthetic plan to ensure an optimal clinical result for the definitive restorations. Furthermore, this procedure allows most adjustments to the lithium disilicate ceramic to be made before crystallization and minimizes potential surface and subsurface damage to the definitive restorations.

Clinical outcome of metal-ceramic crowns fabricated with laser-sintering technology

2012-01-01

Tara MA, Eschbach S, Bohlsen F, Kern M. Int J Prosthodont 2011;24:46-8

Sponsoring Organization Directory

2012-01-01

President: Hsu-Tsan Chien, No.85, Pingdeng Rd, Sanmin Chiu, Kaohsiung City 807, Taiwan. E-mail: anna.cheng@msa.hinet.net Vice President: Chia-Chun Liu, 8F, No.6-2, Ln 48, Nanjheng 1st Rd., Fongshan City, Kaohsiung County 830, Taiwan. E-mail: dentalliu@xuite.net

News and Notes

2012-01-01

All items for this section must be in the Editor's office 10 weeks before month of issue.

Editorial Board

2012-01-01

Sponsoring Organizations and Liaisons

2012-01-01

Information for Authors

Carol A. Lefebvre — 2012-01-01

Authors must adhere to the Journal guidelines, which are provided to ensure the expeditious processing of manuscripts. Complete information on manuscript submission may be found at http://journals.elsevierhealth.com/periodicals/ympr. Failure to follow Journal guidelines may result in the rejection of manuscripts or delays in the review process and publication.

Information for Readers

2012-01-01

If you have questions or comments regarding original articles and editorial management, please contact: Dr Carol A. Lefebvre, Georgia Health Sciences University College of Dental Medicine, 1120 15th St, GC-3094, Augusta, GA 30912-1255, Telephone: (706) 721-4558, Fax: (706) 721-4571

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