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Biomedical subjects

Markus B Blatz

Publications and source records attributed to Markus B Blatz.

At least 19 recordsLinked to original sources
PubMed2007

Influence of impression material and time on the 3-dimensional accuracy of implant impressions.

OBJECTIVE: To investigate, in vitro, the effect of time on the 3-dimensional accuracy of open-tray implant impression copings made of polyvinyl siloxane and polyether impression materials. METHOD AND MATERIALS: Reference models with 4 internal connection implants were fabricated. Four sets of 71 direct impressions were made with square impression copings using an open-tray technique. One set of impressions was made with polyether material (material A) and each of 3 polyvinyl siloxane materials (materials B, C, and D). Three-dimensional changes in spatial orientation of the implant analogs were measured over 48 hours using an optical measurement device. Deviation values were summed over 4 points and averaged per impression. Global differences were tested with a nonparametric Kruskal-Wallis test followed by pairwise comparisons using the Mann-Whitney U test. RESULTS: The mean dimensional accuracy of implant impressions significantly differed over time (P < .001). Materials A and B were found to produce comparable results, For materials C and D there was a significant increase in deviations, with a maximum increase at 2 hours. Deviations for material C were comparable to materials A and B at 48 hours. Baseline values were not maintained by any material. CONCLUSIONS: Within the limits of this in vitro study, it can be concluded that time cannot be neglected as a factor affecting the accuracy of implant master casts.

Dental Implants↗
PubMed2006

Application of interim fixed reference points to maintain the occlusal vertical dimension: a technique for immediate loading protocols in the edentulous mandible.

This article describes a technique for the clinical insertion and use of specially designed screws as fixed intraoral reference and attachment points in implant dentistry. After insertion, these screws serve to stabilize radiographic and surgical templates in the completely edentulous patient. This approach provides the advantage of guiding maintenance of the correct occlusal vertical dimension and ensuring accuracy and stability during subsequent phases of treatment.

Acrylic Resins↗
PubMed2006

Adhesive cementation of chairside CAD/CAM inlays and onlays.

Chairside CAD/CAM restorations offer aesthetic, functional, biocompatible, and long-term successful alternatives to traditional materials and techniques, and can be fabricated in one appointment. Adhesive cementation is key for the long-term clinical success of CAD/CAM inlays and onlays. The clinical use of a newly developed composite resin cement for adhesive cementation of CAD/CAM inlays/onlays has been described.

Adult↗
PubMed2005

Prosthodontic considerations for predictable single-implant esthetics in the anterior maxilla.

Long-term functional and esthetic success with implant-supported single-tooth restorations requires a comprehensive and interdisciplinary treatment approach. Important parameters include the initial clinical situation, the surgical approach, the provisional phase, and the choice of abutment material and design as well as the definitive restoration. This article presents the main aspects of current treatment protocols and discusses material options and clinical techniques to achieve predictable outcomes.

Adult↗
PubMed2005

Selected characteristics of a new polyvinyl siloxane impression material--a randomized clinical trial.

OBJECTIVES: This study evaluated the ability of a new polyvinyl siloxane impression material (Affinis, Coltène/Whaledent, material A) to obtain final impressions free of bubbles and voids for indirect fixed cuspal-coverage restorations. The results were compared to a control polyvinyl siloxane impression material (material B). Both materials were handled by inexperienced clinicians (undergraduate dental students) in student clinics. METHOD AND MATERIALS: One-hundred and thirty patients who were treated in the Louisiana State University School of Dentistry Junior Student Clinic for indirect fixed cuspal-coverage restorations and who met the inclusion criteria were randomly assigned to either one of two treatment groups, group A (n = 65) or group B (n = 65). Two calibrated examiners evaluated the first impression of prepared posterior teeth at a magnification of 10x for acceptability (no voids or bubbles). Position of tooth, type of preparation, preparation finish line (Class I-V), and gingival bleeding scores were recorded. All statistical tests were performed with the level of significance set at .05. RESULTS: The Fisher-Freeman-Halton test did not reveal significant associations between material and gingival bleeding score (P = .492). Significant differences in the location of the preparation finish line between materials were observed (P = .0096); material A was more frequently used in cases where the preparation finish line was located at least 2 mm subgingivally. Logistic regression was used to assess the effect of the material on the success of the impression (acceptable/ unacceptable). Material was highly significant in the logistic model (P < .001) with an odds in favor of an acceptable impression being eight times higher with material A than with material B (odds ratio = 8.00; 95% confidence index for odds ratio: 2.832, 22.601). The 60/65 (92.3%) impressions made with material A and 39/65 (60%) impressions made with material B were rated "acceptable." CONCLUSION: The new polyvinyl siloxane impression material provided a significantly higher proportion of impressions free of bubbles and voids than the control polyvinyl siloxane material.

Chi-Square Distribution↗
PubMed2005

Clinical considerations for densely sintered alumina and zirconia restorations: Part 1.

Densely sintered alumina- and zirconia-based restorations were introduced to dentistry in the early 1990s and became a popular treatment modality, especially in situations requiring complete-coverage restorations. The use of industrial technologies for the fabrication of the restoration, simple clinical management, and pleasing esthetic outcome have made these restorations an attractive treatment alternative. This article reviews the nature of the materials used and the technologies involved and provides indications for clinical case selection and tooth preparation.

Adult↗
PubMed2005

Clinical considerations for densely sintered alumina and zirconia restorations: part 2.

Part 1 of this series provided the foundation for understanding the nature of densely sintered alumina- and zirconia-based restorations, provided guidelines for case selection, and addressed framework design considerations. This article discusses guidelines for lamination of the densely sintered alumina- and zirconia-based restorations and proper try-in, and examines options for conventional and adhesive luting procedures.

Adult↗
PubMed2005

Implant-supported prosthetic treatment in cases with hard- and soft-tissue defects.

Tooth loss due to trauma or periodontal disease is often associated with extensive deficiencies of the supporting hard and soft tissues and atrophy of the alveolar ridges. The functional and esthetic predictability of an implant-supported prosthetic restoration in patients with extensive tissue augmentation is guarded, even when lost tissues were restored at an early stage by local ridge augmentation. The prosthetic reconstruction of major tissue defects is especially difficult, as lost structures of the alveolar ridge must be replaced by the restoration, which is expected to provide optimal function and esthetics, yet allow for optimal oral hygiene. This article presents prosthetic solutions for replacing missing hard and soft tissues with implant-supported fixed and removable restorations in cases of severe tissue deficiencies.

Dental Prosthesis, Implant-Supported↗
PubMed2004

Single-implant restorations: a contemporary approach for achieving a predictable outcome.

The replacement and restoration of missing single teeth with dental implants are routine procedures. However, because of the relatively short clinical history of this procedure in dentistry, custom-tailored protocols for this procedure do not exist. This article will outline the various surgical and restorative steps involved in the treatment planning, fabrication, and delivery of single-implant restoration, and will critically analyze the existing clinical concepts and provide recommendations based on a contemporary approach. As data for and experience with this procedure increase the same general guidelines for all types of implant restorations may not apply. Emphasis will be placed on differentiating between the various types of single-implant restorations, comparing and contrasting the differences between the different types of single-implant restorations, and revising some of the existing concepts of this treatment modality.

Anodontia↗
PubMed2004

In vitro evaluation of shear bond strengths of resin to densely-sintered high-purity zirconium-oxide ceramic after long-term storage and thermal cycling.

STATEMENT OF PROBLEM: The few available studies on the resin bond to zirconium-oxide ceramic recommend airborne-particle abrasion and modified resin luting agents containing adhesive monomers for superior and long-term durable bond strengths. It is unknown whether this regimen can also be successfully applied to the intaglio surface of a commercial zirconia-based all-ceramic system. PURPOSE: The purpose of this study was to evaluate and compare bond strengths of different bonding/silane coupling agents and resin luting agents to zirconia ceramic before and after artificial aging. MATERIAL AND METHODS: Composite cylinders (2.9 mm x 3.0 mm) were bonded to airborne-particle-abraded intaglio surfaces of Procera AllZirkon specimens (n=80) with either Panavia F (PAN) or Rely X ARC (REL) resin luting agents after pretreatment with Clearfil SE Bond/ Porcelain Bond Activator (Group SE). In another group, Rely X ARC was used with its bonding/silane coupling agent (Single Bond/Ceramic Primer, Group SB). PAN without any bonding/silane agent (Group NO) was the control. Subgroups of 10 specimens were stored in distilled water for either 3 or 180 days before shear bond strength was tested. One hundred eighty-day-old specimens were repeatedly thermal cycled for 12,000 cycles between 5 and 60 degrees C with a 15-second dwell time. Data were analyzed with 1- and 2-way analysis of variance and the Tukey multiple comparisons test (alpha=.05). Failure modes were examined under original magnification x25. RESULTS: After 3 days, SE-REL (25.15 +/- 3.48 MPa) and SE-PAN (20.14 +/- 2.59 MPa) groups had significantly superior mean shear bond strengths (P=.0007) compared with either NO-PAN (17.36 +/- 3.05 MPa) or SB-REL (16.90 +/- 7.22 MPa). SE-PAN, NO-PAN, and SB-REL groups were not significantly different. Artificial aging significantly reduced bond strengths. After 180-day storage, SE-PAN (16.85 +/- 3.72 MPa), and SE-REL (15.45 +/- 3.79 MPa) groups demonstrated significantly higher shear bond strengths than NO-PAN (9.45 +/- 5.06 MPa) or SB-REL (1.08 +/- 1.85 MPa) groups. The modes of failure varied among 3-day groups but were 100% adhesive at the ceramic surfaces after artificial aging. CONCLUSION: Artificial aging significantly reduced bond strength. A bonding/silane coupling agent containing an adhesive phosphate monomer can achieve superior long-term shear bond strength to airborne-particle- abraded Procera AllZirkon restorations with either one of the 2 resin luting agents tested.

Bisphenol A-Glycidyl Methacrylate↗
PubMed2004

Clinical application of surgical fixation screws in implant prosthodontics--Part I: positioning of radiographic and surgical templates.

Proper implant position and angulation are fundamental for functional and optimal esthetic implant rehabilitation. This article describes the clinical application of surgical microfixation screws for stabilization and support of radiographic and surgical templates in edentulous patients. These screws provide fixed reference points for exact positioning of a diagnostic device.

Bone Screws↗
PubMed2004

Clinical application of surgical fixation screws in implant prosthodontics--Part II: Indexing implant position.

The accurate transfer of intraoral implant position to the definitive cast in situations of immediate implant loading in completely edentulous patients is an important step and may be difficult to achieve with common transfer and impression methods. Intraoral fixed points of reference accurately transferred to the definitive cast are necessary to provide precise and stable placement of radiographic and surgical templates during the presurgical diagnostic phase, during implant placement, and during fabrication of an immediate provisional restoration. This article describes a technique using surgical microfixation screws to provide fixed reference points and transfer the position of the conventional implants to the definitive cast.

Acrylic Resins↗
PubMed2004

Prosthetic design considerations for anterior single-implant restorations.

UNLABELLED: The anterior single-implant restoration provides a predictable solution for the partially edentulous patient. The two main approaches in prosthesis design for the single-implant restoration are the screw-retained and cement-retained restorations. Although both approaches have been proven to work from a standpoint of long-term implant stability, other considerations arise when esthetic outcome and ease of fabrication and delivery are discussed. To guarantee a predictable outcome, the dentist should choose a design that offers maximum prosthetic versatility. Combining prosthetic versatility with ease of delivery is often a clinical and laboratory challenge. Prostheses designs that provide the freedom to select a wide variety of restorative materials may be cumbersome to deliver and maintain and vice versa. This article reviews the advantages and shortcomings of each design and provides an alternative prosthesis design that combines the favorable aspects of these two restorations. CLINICAL SIGNIFICANCE: Screw-retained and cement-retained prostheses are the common designs for single-implant restorations and possess clinical advantages and shortcomings. An alternative and affordable design, that is mainly beneficial when standard stock implants components are used, is presented. It enables the clinician to achieve optimal esthetics in the esthetic zone combined with a simple and time-efficient delivery.

Dental Implantation, Endosseous↗
PubMed2004

Immediate loading of dental implants in the edentulous mandible.

BACKGROUND: The authors review the literature regarding immediate implant loading in the anterior edentulous mandible, demonstrate the technique they currently use, review preliminary results and present an illustrative case. MATERIALS AND METHODS: The authors conducted a literature search using PUBMED and Ovid databases. They considered for review 31 articles in English from 1969 to 2003 that pertained to immediate loading of the anterior mandible. The authors developed a technique to provide a bar-supported prosthesis on the day of surgery. They treated five patients and followed them up for at least six months. The preliminary results are presented. RESULTS: This literature review demonstrated that immediate loading of anterior mandibular implants is an acceptable method, with predictable results. This case series demonstrates the potential for delivering a final bar on the day of surgery, based on the current evidence and clinical application. CONCLUSIONS AND PRACTICE IMPLICATIONS: The method described provides patients with immediate prosthetic restorations and a decreased treatment time compared with that for the traditional two-stage implant approach.

Dental Implantation, Endosseous↗
PubMed2004

In vitro durability of the resin bond to feldspathic ceramics.

PURPOSE: To measure and compare shear bond strength of three different resin-based composite cements (Panavia 21, Noribond DC, and Variolink II) to two feldspathic ceramic materials (Noritake EX-3 and Ceramco) after 3 days (at baseline) and after 180 days of water storage and repeated thermocycling. METHODS: Composite cylinders were bonded with Panavia 21, Noribond DC, and Variolink II to the hydrofluoric acid (HF)-etched surfaces of either Noritake Super Porcelain EX-3 (NEX) or Ceramco (CER) following the manufacturers' directions. Subgroups of 15 specimens were stored in distilled water for either 3 days without thermocycling or 180 days with 12,000 thermal cycles. Shear bond strength was measured and compared by loading each specimen in shear to failure in an Instron testing system. Data were analyzed with a three-factor ANOVA model. Post-hoc multiple comparisons of the individual main-effect levels were performed with Tukey's HSD multiple comparison procedure (alpha = 0.05). RESULTS: Mean bond strength did not differ for the two ceramic materials. Differences in mean bond strength were found among the bonding systems and between the early and late time points. Panavia exhibited significantly lower bond strength as compared to Noribond and Variolink II for both early and late time points, with a greater difference at 180 days. For all groups, failure modes were almost exclusively cohesive in the ceramic, which indicates sufficient resin-ceramic bonds with all tested materials.

Acid Etching, Dental↗
PubMed2004

Replacement of missing maxillary canines with dental implants: prosthesis design considerations.

Replacing a missing canine with a dental implant is the optimal treatment plan. The strategic roles canines play in maintaining normal function and the high visibility of these teeth, especially in the maxilla, require a restoration that provides uncompromised function and aesthetics. Eliminating lateral forces on the implant can minimize implant complications, but in young patients (ie, with steep canine guidance) achieving such a goal presents a restorative challenge. This article discusses several considerations (ie, ease of maintenance, retrievability) that will affect the design of the definitive restoration.

Adult↗