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At least 55 records · Page 3Linked to original sources
PubMed1994

Replacement of missing cusps: an in vitro study.

One of the commonest methods of replacing a missing cusp, a pinned amalgam restoration, was compared with three adhesive restorative techniques, two of them with additional pin retention. All the teeth were subjected to occlusal/lateral forces and loaded to fracture in an Instron testing machine. A layered restoration of glass ionomer cement replacing the dentine, and resin composite replacing the enamel, without pins required more force to fracture than any of the other techniques including the pinned amalgam restoration. A composite restoration with dentine bonding agent and additional pin retention was second best and significantly better than the pinned amalgam restoration. A cermet restoration with additional pin retention required slightly less force to fracture than pin-retained amalgam restorations, but not significantly so.

Bicuspid↗
PubMed2006

Effect of food-simulating liquids on the mechanical properties of provisional restorative materials.

OBJECTIVES: The purpose of this study was to investigate the effects of food-simulating liquids (FSL) on the mechanical properties of provisional restorative materials. METHODS: Four provisional restorative materials were selected: (1) Dentalon Plus (DP), (2) Protemp II (PII), (3) Systemp C&B (SCB) and (4) Integrity (INTG). The specimens were fabricated in customized molds and each type was randomly divided into five groups (n = 10). The test groups were conditioned for 7 days at 37 degrees C as follows: water, 0.02 N citric acid, heptane and 75% ethanol in aqueous solution. Specimens in the control group were stored at room temperature in air. After conditioning, the flexural strength (FS) values were assessed using a universal testing machine (5 mm/min crosshead speed) and the fractured specimens were used for the determination of the Knoop hardness number (KHN) using a digital micro-hardness tester (100 gf/15 s). Kruskal-Wallis and Mann-Whitney U-tests were used for statistical analysis. RESULTS: In ethanol and heptane solutions, DP specimens were totally degraded, thus, FS/KHN for DP could not be measured. For all materials, the FS/KHN values were significantly lower than their control groups after conditioning in ethanol. After heptane conditioning, the decrease in FS for SCB and KHN for PII were statistically significant. After citric acid conditioning, KHN for PII and INTG were significantly higher than the controls and the decrease in FS for SCB and INTG were statistically significant. SIGNIFICANCE: The mechanical properties of provisional restorative materials are strongly influenced by food-simulating liquids.

Beverages↗
PubMed2006

Immediate loading versus immediate provisionalization of maxillary single-tooth replacements: a prospective randomized study with BioComp implants.

PURPOSE: The aim of this prospective randomized study was to evaluate the clinical outcome of immediately loaded solid plasma sprayed (TPS) BioComp (BioComp Industries BV, Vught, The Netherlands) implants versus immediate provisionalized but non-loaded BioComp implants in the anterior and premolar region of the maxilla. MATERIALS AND METHODS: Forty-eight patients (31 females and 17 males) with a mean age of 42.3+/-13.1 years (range 19 to 78 years) were included in the study. Fifty threaded TPS implants were placed and provisionalized within 24 hours after surgery. The patients were randomly assigned to 2 groups. In the immediate loaded (IL) group (n=24) the occlusion of the provisional was designed with normal contacts in centric relation and at lateral excursions, while in the non-immediate loaded (IP) group (n=24) the provisional restoration was adjusted to clear all occlusal contacts or contacts at lateral excursions. Patients were instructed to eat a soft diet and to avoid placing food in the area of the provisional crown during the first 6 weeks. Regular clinical and radiographic controls were performed and the survival rate and implant stability quotient (ISQ) values were evaluated at delivery of the definitive restoration at 6 months. At 1 year, radiographic coronal bone defects and gingival esthetics between the 2 groups were assessed. RESULTS: Of the IL group, 2 fixtures were lost, while 3 implants were lost in the IP group. The failing implants showed increasing mobility at 2 to 3 weeks after insertion, and were removed. The remaining 45 implants were stable at every subsequent follow-up examination, and 6 months after implant placement, ISQ values were measured. The mean ISQ value in the IL group was 63.7+/-5.8 versus 63.2+/-4.3 for the IP group (P=.78). The mean mesial marginal bone loss after 12 months in the IL group was 0.27+/-0.2 mm versus 0.28+/-0.22 mm in the IP group (P=.9). The mean distal marginal bone loss after 12 months in the IL group was 0.19+/-0.15 mm versus 0.2+/-0.11 mm in the IP group (P=.87). All implants of the IL group had an ideal gingival buccal margin, versus 91% of the IP group. Full regeneration of the mesial interdental papilla was observed in 70% of the IL group versus 91% of the IP group, while full regeneration of the distal papilla was observed in 91% of both the IL and IP implants. CONCLUSION: No significant differences in ISQ mean values in radiographic bone loss and gingival esthetics were found between immediate non-loaded provisionalization and immediately loaded BioComp implants in the maxilla.

Adult↗
PubMed1999

Composite veneered acrylic resin provisional restorations for complete veneer crowns.

Restorations that are remade to improve esthetics, teeth with pronounced gingival-to-incisal color contrast, or high-value translucent teeth can limit the capability of shaded acrylic resin provisional restorations to satisfy the esthetic demands of certain patients. This article describes a procedure to incorporate a composite veneer in an acrylic resin provisional restoration. Improved optical properties of microfilled composite are combined with the excellent marginal seal and contour of acrylic resin. Precise control of color, translucency, and surface texture provide excellent interim esthetics and a better guide for the definitive prosthesis.

Acrylic Resins↗
PubMed2002

Crowns and other extra-coronal restorations: porcelain laminate veneers.

Porcelain veneers are resin-bonded to the underlying tooth and provide a conservative method of improving appearance or modifying contour, without resorting to a full coverage crown. The porcelain laminate veneer is now a frequently prescribed restoration for anterior teeth. The sums spent by the Dental Practice Board on this type of treatment increased from quarter of a million pounds in 1988/89 to over seven million in 1994/95, representing some 113,582 treatments. Since that time the number has stabilised at over 100,000 veneers prescribed each year. The objective of this paper is to give a practical guide on providing these restorations.

Communication↗
PubMed2006

Screw versus cemented implant supported restorations.

Implant supported restorations can be attached to implants with screws or can be cemented to abutments which are secured to implants with screws. Screw retained implant restorations are the authors' preferred method of securing restorations to implants. This article will be written from this perspective and the advantages and disadvantages of each method of retention will be discussed under the following headings: Aesthetics, Retrievability, Retention, Implant placement, Passivity, Provisionals, Occlusion, Immediate loading, Impression procedures, Long term treatment planning.

Cementation↗
PubMed2000

Changes in marginal gap size of provisional resin crowns after occlusal loading and thermal cycling.

STATEMENT OF PROBLEM: Resin materials used for provisional crowns tend to develop enlarged marginal gaps over time. With the advent of new interim resin materials in dentistry that are used for longer clinical periods, controlled comparative analysis of the structural stability of these materials in the oral environment is required. PURPOSE: This study analyzed marginal gap size changes resulting from occlusal loading and thermal cycling and related these results to material properties. MATERIAL AND METHODS: Groups (n = 10) of provisional crowns were made using 4 resin materials (Jet-relined, Snap-relined, Snap-unrelined, Alike-unrelined). Specimens were first fabricated on a metal master die and fitted with and relined on the master die to standardize pretreatment marginal gap size. Custom die stems were fabricated from a low-fusing alloy (Cerroblend) and cemented with Tempbond cement. The samples were treated with occlusal loading (50,000 cycles, 40 N, 4 Hz) and thermocycling (8, 000 cycles, 5 degrees C to 60 degrees C). Measurements of marginal gaps were recorded before and after treatment. RESULTS: The mean changes in marginal gap sizes were Jet-relined, 152.1 microm +/- 69. 6; Snap-relined, 548.9 microm +/- 168.3; Snap-unrelined, 446.6 microm +/- 91.8; and Alike-unrelined, 43.9 microm +/- 48.7. Two-way ANOVA revealed a significant difference between groups (F=51.758, df 3,1, P</=.0001). Tukey/Kramer (P </=.01 level) indicated a significantly larger gap increase for the Snap-relined and Snap unrelined groups. CONCLUSION: There were significant differences between different brands of resin materials used for provisional crowns. Each must be evaluated individually for stability in the oral environment.

Analysis of Variance↗
PubMed2002

Flexural strength of provisional crown and fixed partial denture resins.

STATEMENT OF PROBLEM: Provisional prostheses are subject to flexure under function. Selection of the appropriate material for their fabrication is difficult given the limited evidence-based information on the flexural strength of provisional resins. PURPOSE: This study compared the flexural strength of 5 methacrylate-based resins and 8 bis-acryl resins used to fabricate provisional crowns and fixed partial dentures. MATERIAL AND METHODS: Bar-type specimens were fabricated according to American National Standards Institute/American Dental Association specification 27. After being immersed in artificial saliva at 37 degrees C for 10 days, the specimens were fractured under 3-point loading in a universal testing machine at a crosshead speed of 0.75 mm/min. Maximal loads to fracture in Newtons were recorded. Mean flexural strengths were calculated in MPa (n = 10 per group). Comparisons were made with analysis of variance and Duncan's multiple range test (P<.05). RESULTS: Mean flexural strengths ranged from 56.2 to 123.6 MPa. There were 4 statistically similar groups. The group with the highest strengths consisted of 4 bis-acryl materials (Provipont, Integrity, Protemp 3 Garant, and Luxatemp). CONCLUSION: Within the limitations of this study, flexural strengths were material- rather than category-specific. Some, but not all, bis-acryl resins demonstrated significantly superior flexural strength over traditional methacrylate resins.

Acrylic Resins↗
PubMed2004

Rationale for the application of immediate load in implant dentistry: part II.

Immediate loading of an implant interface has been used for completely and partially edentulous patients. A biomechanical rationale to decrease the initial risk of overload is reasonable, because implant failure and overload has been well established. This article addresses methods to decrease stress to the transitional restoration. Forces may be influenced by patient factors, implant position, cantilever forces, occlusal load direction, occlusal contact intensity, and diet. The surface area of load distribution may be increased by implant size, implant design, and surface condition of the implant body. A blend of these factors affects the amount of stress to the developing implant interface and hence may affect the risk of immediate occlusal loading for implant prostheses.

Alveolar Process↗
PubMed2005

Effect of provisional restorations on the final bond strengths of porcelain laminate veneers.

The purpose of this in vitro study was to evaluate the effect of the different provisional restorations cementation techniques on the final bond strengths of porcelain laminate veneers (PLVs). Thirty-six extracted human central incisors were sectioned 2 mm below the cemento-enamel junction, and crown parts were embedded into self-cure acrylic resin. Standardized PLV preparations were carried out on labial surfaces of the teeth. Then the teeth were randomly divided into three groups of 12 each. In group 1, provisional restorations were cemented with eugenol-free cement. In group 2, prepared teeth surfaces were first coated with a desensitizing agent then provisional restorations were cemented with resin cement. In group 3, provisional restorations were not fabricated to serve as control. After specimens were stored in distilled water for 2 weeks, provisional restorations were removed and final IPS Empress 2 ceramic veneers were bonded with a dual-curing resin. Two microtensile samples from each tooth measuring 1.2 x 1.2 x 5 mm were prepared. These sections were subjected to microtensile testing and failure values were recorded. The data were analysed by one-way anova and Tukey HSD tests. The PLVs, placed on the tooth surface that had received a dentine desensitizer and provisional restorations luted with resin cement (group 2), showed the lowest bond strength in all test groups. But no statistically significant differences were found between the bond strength of PLVs in control group (no provisional restorations) and group 1 (provisional restorations cemented with eugenol-free cement before final cementations). Scanning electron microscopic (SEM) examination of this study also showed that the bonding to enamel surface was better in control group and group 1 than group 2.

Dental Bonding↗
PubMed2004

An image-guided system-drilled surgical template and trephine guide pin to make treatment of completely edentulous patients easier: a clinical report on immediate loading.

PURPOSE: An image-guided system has been developed to drill a conventional surgical guide following a preoperative three-dimensional plan for accurate placement of implant on bone. The aim of this study is to illustrate how this system facilitates treatment of completely edentulous patients by modifying both surgical and prosthetic protocols, thereby making flapless surgery possible as well as the preparation of the transitional prosthesis before surgery. MATERIALS AND METHODS: This system was tested on 10 consecutive patients, placing all planned implants without raising the mucoperiosteal flap and with the connection of all implants to pre-angulated abutments. RESULTS: A 1-year follow-up demonstrated stable and properly functioning prostheses in all cases. CONCLUSIONS: This technique can be expected to flourish because implantology makes the highest demands on comfort, precision, and safety.

Dental Abutments↗
PubMed2004

Provisional implants: a clinical prospective study in 45 patients, from implant placement to delivery of the final bridge.

BACKGROUND: Protocols for submerged healing of dental implants often require the patient to have no teeth until suture removal and to wear a removable prosthesis during the remaining healing period. This may be inconvenient for the patient, and healing may be influenced negatively by the removable prosthesis. PURPOSE: The aim of the present prospective clinical study was to evaluate the use of provisional implants (PIs) to provide patients with a provisional fixed bridge during the healing of permanent implants. MATERIALS AND METHODS: Twenty female and 25 male patients were consecutively included in the study. The 45 patients were treated for either partial (16 patients) or total (29 patients) edentulism in the maxilla. The permanent implants were placed first; as many PIs as possible were then installed between the permanent implants. After suturing, impressions from which to manufacture provisional bridges (to be cemented to the PIs) were taken. The patients were monitored with clinical and radiographic follow-up from implant placement to delivery of the final prosthesis. RESULTS: Five (2.2%) of the 230 permanent Brånemark System implants (Nobel Biocare AB, Gothenburg, Sweden) did not integrate. None of the failures could be related to the presence of PIs between the permanent implants. Seven PIs failed during the observation period. In addition, 17 (9%) of the 192 PIs showed mobility at the second-stage surgery although they had supported the provisional bridges without clinical symptoms. Forty-four of 45 patients showed stabile PI bridges at the time of second-stage surgery. CONCLUSION: Based on our experiences we concluded that provisional implants can be successfully used to provide patients with a fixed provisional bridge during the healing of permanent implants.

Adult↗
PubMed2005

Simplified treatment of the atrophic posterior maxilla via immediate/early function and tilted implants: A prospective 1-year clinical study.

BACKGROUND: Posterior maxillae are often difficult to treat owing to the sinus antrum. Placing implants in remaining bone regions in the atrophic maxilla, without performing sinus grafting, is a challenge. Immediate function adds to this challenge. PURPOSE: The purpose of this study was to suggest and evaluate a simplified treatment concept for the rehabilitation of the atrophic maxilla using tilted implants subjected to immediate/early function. MATERIALS AND METHODS: Eighteen patients were included in the study. Sixty implants were placed to support 19 fixed partial or full-arch prostheses. Immediate/early function was applied. The patients were followed for a minimum of 1 year after prosthesis connection. Stability measurements and radiographic evaluation of the change of the marginal bone level were performed. RESULTS: One axial and one tilted implant failed in one patient, giving a cumulative survival rate of 96.7%. No failure of provisional prostheses occurred. The mean marginal bone resorption recorded after 1 year was low (0.82 mm for axial implants and 0.34 mm for tilted implants). CONCLUSION: The results of the present study suggest that tilted implants placed in immediate function may be a viable treatment approach for the rehabilitation of the atrophied maxilla. Simplified treatment procedures, reduced surgical invasion, shorter treatment time, and reduced costs constitute some of the benefits for the patient and the clinician.

Aged↗
PubMed2005

All-on-4 immediate-function concept with Brånemark System implants for completely edentulous maxillae: a 1-year retrospective clinical study.

BACKGROUND: Immediate implant function has become an accepted treatment modality for fixed restorations in totally edentulous mandibles, whereas experience from immediate function in the edentulous maxilla is limited. PURPOSE: The purpose of this study was to evaluate a protocol for immediate function (within 3 hours) of four implants (All-on-4, Nobel Biocare AB, Göteborg, Sweden) supporting a fixed prosthesis in the completely edentulous maxilla. MATERIALS AND METHODS: This retrospective clinical study included 32 patients with 128 immediately loaded implants (Brånemark System TiUnite, Nobel Biocare AB) supporting fixed complete-arch maxillary all-acrylic prostheses. A specially designed surgical guide was used to facilitate implant positioning and tilting of the posterior implants to achieve good bone anchorage and large interimplant distance for good prosthetic support. Follow-up examinations were performed at 6 and 12 months. Radiographic assessment of the marginal bone level was performed after 1 year in function. RESULTS: Three immediately loaded implants were lost in three patients, giving a 1-year cumulative survival rate of 97.6%. The marginal bone level was, on average, 0.9 mm (SD 1.0 mm) from the implant/abutment junction after 1 year. CONCLUSION: The high cumulative implant survival rate indicates that the immediate function concept for completely edentulous maxillae may be a viable concept.

Acrylic Resins↗
PubMed1999

Use of a customized rigid clear matrix for fabricating provisional veneers.

UNLABELLED: The fabrication of provisional veneers is time consuming, and may be unpredictable, especially in cases of multiple veneer preparations; however, functional and esthetic provisional veneers, may be used as diagnostic adjuncts for the fabrication of the definitive restoration. This article presents, in a step-by-step procedure, the use of a customized rigid clear matrix with light-cured composite resin as a fast alternative for the fabrication of functional and esthetic provisional composite resin veneers. CLINICAL SIGNIFICANCE: The use of a customized rigid clear matrix for the fabrication of light-cured composite resin provisional veneers has the following advantages: the shape and surface texture produced in the diagnostic wax-up are accurately transferred to the patient's mouth; the provisional restoration is fabricated without violation of the soft tissue and the margins of the preparations; use of the matrix can be repeated when needed; and esthetic and functional provisional veneers can be fabricated relatively quickly.

Cuspid↗