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At least 991 records · Page 55Linked to original sources
PubMed1994

Assessment of gingival margin thickness before margin placement.

Matrix material can be cut and placed beneath the gingival tissue to mimic a metal collar on a metal/ceramic crown restoration. If this metal matrix causes a discoloration of the gingival tissue, it would be wise to restore the tooth by using an all-porcelain margin.

Crowns↗
PubMed1991

Physical properties of glass-ionomer cements influencing clinical performance.

This paper considers the modern commercial glass-ionomer cements and compares their variable physical properties with specific reference to working and setting times, powder liquid ratios used clinically, finishing techniques and the effects of etching for the laminate technique. The variation in long term mechanical properties of different restorative glass-ionomer cements is examined and the hybrid glass-ionomers are assessed.

Dental Bonding↗
PubMed1993

Three-year follow-up of five posterior composites: in vivo wear.

The wear of five posterior composites at occlusal contact areas (OCA) and contact free occlusal areas (CFOA) was evaluated in Class II cavities over a 3-year period with an accurate 3D-measuring technique. A clinical evaluation was also performed. The ultrafine compact-filled composites (Willems et al., 1992) showed acceptable OCA-wear rates ranging from 110 to 149 microns after 3 years. This is very similar to the OCA-wear rate of human enamel on molars, which is about 122 microns after 3 years. The fine compact-filled composite had an unacceptable OCA-wear value of 242 microns after 3 years. The ultrafine midway-filled composite showed an exceptionally high CFOA-wear value of 151 microns after 3 years, which gave the impression of it being gradually washed out of the cavity. Clinically, 70% of the restorations made with the ultrafine midway-filled composite showed excellent colour match after 3 years. For most of the compact-filled composites slightly opaque fillings were noted and 63% of the restorations made with one of these materials were clearly opaque. It can be concluded that the investigated ultrafine compact-filled composites can be considered as amalgam alternatives as far as their wear resistance is concerned.

Adult↗
PubMed2003

Smile analysis.

Explore the source record for details and available documents.

Dental Stress Analysis↗
PubMed2004

Reconstruction of the mandible using preshaped 2.3 mm titanium plates, autogenous particulate cortico-cancellous bone grafts and platelet rich plasma: a report on eight patients.

The results are presented of eight patients who had partial mandibulectomies for malignant tumours and were secondarily reconstructed with pre-shaped 2.3 mm titanium plates, autogenous particulate cortico-cancellous bone grafts and platelet rich plasma. Healing was uneventful in all cases and when prosthodontically needed, implants were inserted after approximately 6 months, whilst biopsies were taken. The histology showed bone remodelling in six cases, whilst in one case after 6 months the bone was largely replaced by abundant fibrous tissue. In this case the implants were lost after 9 months. In one case a new carcinoma developed after 6 months with subsequent death of the patient. Thus, in six patients adequate results were achieved with adequate functional and aesthetic outcome, given the poor conditions of the surrounding tissues. This method provides three-dimensional reconstruction with sufficient bone height and volume to facilitate prosthodontic treatment.

Aged↗
PubMed2004

Strategies for management of single-tooth extraction sites in aesthetic implant therapy.

Achieving predictable aesthetic outcomes following the planned removal of a natural tooth suffering from structural, endodontic, or periodontal compromise depends on a multitude of factors that, once identified, guide the implant team in selecting the surgical and prosthetic treatment options best suited for the individual clinical scenario. This article presents pertinent information regarding systematic patient evaluation and special treatment planning considerations for patients facing the loss of a single tooth in an area of high aesthetic importance. The rationale for and details of performing the Bio-Col site preservation technique at the time of tooth removal; guidelines for immediate versus delayed implant placement; selection and sequencing of site-development procedures according to the types of alveolar ridge defects encountered following tooth removal despite the use of site preservation; and a description of prosthetic techniques necessary for the successful management of single-tooth extraction sites in areas of aesthetic concern also are reviewed.

Alveolar Process↗
PubMed1997

An investigation of new metal framework design for metal ceramic restorations.

STATEMENT OF PROBLEM: Metal ceramic restorations have been implicated in the discoloration of associated gingival tissues. Attempts to remedy this by altering the design of the metal frameworks for such restorations may lead to unacceptable decreases in fracture resistance. PURPOSE: This study evaluated a new metal framework design for metal-ceramic restorations. MATERIAL AND METHODS: Twenty artificial crowns were fabricated with various degrees of facial metal reduction; 0, 1, 2, and 3 mm. The study was conducted in two parts. The first part evaluated changes in light transmission into adjacent root tissue. A light box was fabricated so sample crowns could be illuminated on a mounted natural tooth. The root of the tooth remained outside the light box, and the light transmitted through the crowns into root tissue was measured with a light meter. The second part of the study evaluated changes in fracture strength. The sample crowns were subjected to a vertical load until fracture with use of an Instron machine at a crosshead speed of 1 mm per minute. The load at fracture was recorded. RESULTS: Results indicated a statistically significant increase in light transmission with 1 mm framework reduction or greater, and fracture strengths did not decrease with up to 1 mm of framework reduction. A 1 mm facial axial reduction of the metal framework may be indicated for anterior metal-ceramic restorations.

Analysis of Variance↗
PubMed1997

Conservative approach to posttraumatic treatment of maxillary anterior teeth: a clinical report.

This clinical report emphasizes that comprehensive treatment planning, whether simple or complex, requires interdisciplinary knowledge. Conservative treatment was implemented for this patient, a 29-year-old woman with a posttraumatic anterior open occlusal relationship, crowding, and a shifted midline. The treatment plan involved selective occlusal grinding, adjunctive orthodontics, periodontal surgery, and cosmetic dentistry and proved to be highly successful.

Adult↗
PubMed1997

A procedure for a modified cylindric titanium abutment.

In the restoration of a single anterior edentulous space with a dental implant, there are three transmucosal elements that could be used within the Nobel Biocare system: the CeraOne abutment, the Estheticone abutment with a nonrotating gold cylinder, and the CerAdapt abutment. This article describes a procedure to modify the CeraOne cylindric titanium abutment with titanium ceramics to achieve an anatomically shaped transmucosal element that does not show evidence of the metal through thin gingival tissue.

Adult↗
PubMed2004

FTIR investigation of monomer polymerisation and polyacid neutralisation kinetics and mechanisms in various aesthetic dental restorative materials.

Diamond ATR FTIR has been used to quantify light catalysed polymerisation and polyacid neutralisation rates in various glass ionomer cements (GIC), resin-modified GICs (RMGIC) and compomers. At 150s after the start of light exposure, levels of methacrylate polymerisation on the lower surfaces of 1mm thick specimens were 97% and 98% for the RMGIC, Vitremer and Fuji II LC and 47% and 37% for the compomers, Compoglass and Dyract. After light exposure, polymerisation rates for the compomers decreased linearly with inverse time. By 50,000s Compoglass and Dyract were 62% and 51% polymerised. Initial rate of polyacid neutralisation in the GIC Shofu HIFI was 0.32 times that of Fuji IX GIC. Those in Vitremer, Fuji II LC, Compoglass and Dyract were 0.16, 0.09, 0.004 and 0.004 times that of Fuji IX. Excluding short initial periods, log of neutralisation rates decreased linearly with log-time. Average gradients were -1.35 for the GIC, -0.80 for the RMGIC and -0.59 for the compomers. By 50,000s, polyacid salt concentrations for the RMGIC and compomers were 0.41 and 0.016 times that of the GIC. Reaction mechanisms have been discussed and used to help interpret material mechanical properties, fluoride release rates and adhesion to tooth structure.

Compomers↗
PubMed1997

Benefits and disadvantages of tooth-coloured alternatives to amalgam.

OBJECTIVES: To give the practising dentist scientifically based data to assist him/her in the responsible decision-making process necessary to weigh the options available to the patient if she/he prefers not to have an amalgam placed. DATA SOURCES: Based on the literature and on the research work, which was done in the author's department, the indications and limitations of the known alternatives of amalgam were formulated. DESCRIPTION OF ALTERNATIVES TO AMALGAM: With the exception of cast gold restorations, all alternatives require the strict use of adhesive techniques. When compared with similar amalgam restorations, placing composite restorations (if they are indicated) takes approximately 2.5 times longer because complex incremental techniques are needed. Despite all the efforts, direct composite restorations placed in large cavities still show unacceptable amounts of marginal openings. Tooth-coloured inlays are a better alternative for large restorations. These restorations must be inserted with adhesive techniques. With composite inlays it is difficult to achieve a composite-composite bond. Ceramic inlays may be micromechanically bonded to the luting composite. They all show clinically a good marginal behaviour and the use of ultrasonic energy may further simplify the application technique of aesthetic inlays. STUDY SELECTION: Papers describing the different techniques were used as a base for the corresponding chapter. To assess and compare the longevity of the different restoration types, literature data were used. We limited ourselves to papers reporting at least 5-year clinical data. Longitudinal, clinically controlled studies were preferred. However, to be more complete, retrospective, cross sectional studies were also included. LONGEVITY OF POSTERIOR RESTORATIONS: Amalgam shows excellent longevity data with studies up to 20 years. The average annual failure rate is 0.3-6.9%. Posterior composites are in the same range (0.5-6.6%), however, the study times are much shorter (max. 10 years). For tooth-coloured inlays much less data are available. Longevity is reported up to 6 years with annual failure rates of 0.6-5%. CONCLUSIONS: All aesthetic alternatives to amalgam require more complex procedures and more time. If cost benefit considerations are a concern, amalgam is still the most convenient restorative material for posterior teeth.

Bicuspid↗
PubMed1998

Long-term flexural strength of three direct aesthetic restorative materials.

OBJECTIVES: This investigation evaluates the long-term flexural strength behaviour of three different glass-ionomer cement (GIC) based materials. METHODS: The materials under investigation were a conventional GIC (Opusfil), a metal-reinforced GIC (Opus Silver) and a resin-modified GIC (Fuji II LC). Flexural strength specimens of the materials were prepared according to the relevant manufacturers' instructions for clinical use. After 10-min maturation at 37 degrees C, the specimens were placed in water, also at 37 degrees C, until required for testing. Specimens were tested under four-point bend at intervals between 7 and 130 days after manufacture. RESULTS: Opusfil increased in strength up to day 56, but was significantly weaker after this time. Opus Silver was strongest on day 7, although there was no further decline in strength after day 14. Fuji II LC increased in strength up to day 14, but there was deterioration in strength after day 100. Opus Silver had the highest early strength of the three materials, but after day 7 there was no significant difference in strength between the three materials under test. CONCLUSIONS: The three cements tested did not exhibit the continued increase in strength with time that has been attributed to glass-ionomer cements. Each material behaved differently, but they all appeared to be adversely affected by storage in aqueous media. Materials formed by the inclusion of metal or the incorporation of resins into the glass-ionomer cement formulation should be regarded as separate sub-classes of materials in their own rights.

Dental Cements↗