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At least 757 records · Page 42Linked to original sources
PubMed1995

Palatal surgery without denudation of bone favours dentoalveolar development in dogs.

The present study compared the dentoalveolar development in beagle dogs after palatal repair according to the partially split flap technique and the von Langenbeck method. It was concluded that palatal surgery according to the partially split flap technique resulted in significantly wider transverse distances of the maxillary dental arch than after the von Langenbeck procedure and that its final outcome closely resembled that of the control group.

Alveolar Process↗
PubMed1992

Dentistry in Poland.

A visit to the Orthodontic Institute in Warsaw was kindly sponsored by American Orthodontics in order to enable a straight wire typodont course to be conducted. The entire orthodontic department turned out for the course, and it proved to be a stimulating and enjoyable few days. This report details the state of orthodontics in Poland and aims to outline various similarities and differences between dental training in Warsaw and in Great Britain, both at undergraduate and postgraduate levels.

Dentists↗
PubMed2004

The quality of dental casts used in crown and bridgework.

OBJECTIVE: To assess the quality of dental casts used in crown and bridge construction. DESIGN: Observational cross-sectional study of dental casts. SETTING: Commercial dental laboratories and a university dental hospital laboratory in the UK. MATERIALS AND METHODS: A sample (n = 150) of working and opposing casts used for crown and bridgework prescribed by general dental practices and a dental hospital were sampled from two commercial dental laboratories and an 'on-site' university dental hospital laboratory respectively. A simple '3 point' assessment scale of quality (good, fair and poor) was used to categorise the casts depending on the clarity of reproduction of soft and hard tissues. RESULTS: The quality of opposing casts used for articulation purposes was significantly better (P<0.001) than that of the working casts. In addition it was found that for working casts the quality in the preparation area(s) was significantly better (p<0.001) than that in areas remote from preparation(s) in the same arch. In general, the quality of casts in the incisal or occlusal surfaces was better than the buccal and lingual surfaces. CONCLUSIONS: This study has demonstrated that variation exists in the quality of casts used in crown and bridgework, specifically those used in the construction of indirect restorations and also those used for articulation purposes. This study highlights the need for clinicians to exercise continued vigilance with crown and bridge impressions, and casts, particularly in areas away from the prepared teeth.

Analysis of Variance↗
PubMed2001

The use of computed tomography when comparing nickel-titanium and stainless steel files during preparation of simulated curved canals.

AIM: The aim of this study was to compare canal preparations completed with Hedstrom and K-files of ISO size 15 - 40, made of nickel-titanium (Ni-Ti) and stainless steel (SS). METHODOLOGY: Eighty simulated canals with 200 and 30 degrees C curvatures were prepared using the step-back technique and quarter turn/pull instrument manipulation. Middle and apical level canal sections were taken using computed tomography. RESULTS: No significant difference was found between any of the file types at either level with respect to canal curvature (20 degrees or 30 degrees). At the middle level, the stainless steel files caused more enlargement toward the inner part, compared to nickel-titanium files. At the apical level, nickel-titanium canal files caused more enlargement toward the inner part, whereas more outward enlargement was caused by stainless steel instruments. No significant difference could be observed at the middle level (P > 0.05) related to the enlargement toward the outer side of the canal curvature. Transportation at both levels was significantly less (P < 0.001) for the Ni-Ti files than the SS ones. Centring ratios of the file types at the middle level were low, but not significantly different (P > 0.05), whereas at the apical level the centring ratios were significantly higher for the Ni-Ti files (P < 0.001). CONCLUSIONS: Ni-Ti instruments produced preparations with adequate enlargement, less transportation, and a better centring ratio.

Dental Instruments↗
PubMed2001

The CICERO system for CAD/CAM fabrication of full-ceramic crowns.

The CICERO method of crown fabrication consists of optically digitizing a gypsum die, designing the crown layer buildup, and subsequently pressing, sintering, and milling consecutive layers of a shaded high-strength alumina-based core material, a layer of dentin porcelain, and a final layer of incisal porcelain. Final finishing is performed in the dental laboratory. The CICERO method allows efficient production of all-ceramic restorations without compromising esthetics or function. This article reviews the process involved in the fabrication of a CICERO crown.

Aluminum Oxide↗
PubMed2006

A study model based photographic method for assessment of surgical treatment outcome in unilateral cleft lip and palate patients.

The aim of this study was to test the reliability of using digital photographs of study models as an alternative to the use of plaster study models in the assessment of surgical treatment outcome in 5-year-old children with unilateral cleft lip and palate (UCLP). Fifty-six dental study models available from the Managed Clinical Network for Cleft Services in Scotland (CLEFTSiS) database of patients aged 5-years with non-syndromic UCLP were employed. An experienced examiner scored the plaster study models using the modified Huddart/Bodenham system. A set of digital photographs stored in the CLEFTSiS electronic patient record database of five different views of the same study models were scored by three examiners to allow calculation of interexaminer reliability. The same examiners repeated the scoring 1 month later under similar conditions to determine intraexaminer reliability and minimize the influence of memory bias on the results. The mean kappa value for the application of the modified Huddart/Bodenham system on photographs of 5-year-old UCLP study models was 0.65 +/- 0.05. The mean kappa value for the measurement of overjet on the digital photographs was 0.68 +/- 0.07. Using the interpretation suggested by Altman, good agreement for both scoring systems was found. Therefore, digital photographs of study models are a reliable alternative to measuring treatment outcome using study models of 5-year-old children with UCLP.

Child, Preschool↗
PubMed1989

Shaping of simulated root canals in resin blocks using the step-back technique with K-files manipulated in a simple in/out filling motion.

A total of 60 simulated root canals in clear resin blocks of various lengths and degree of curvature were prepared by hand with K-files using a step-back enlargement technique. The instruments were manipulated exclusively with a simple in/out filing or rasping motion with no attempt at rotation or twisting. The preparation technique was assessed by instrumentation time, deformation and fracture of instruments, and loss of working distance. The shape of the prepared canals was assessed by direct inspection and from composite photographic prints produced by superimposing negatives of the canals obtained before and after preparation. In general, the preparations were time-consuming and tedious to complete. Deformation and separation of instruments occurred mainly in those canals with short, severe curves. Loss of working distance was a universal finding and was associated to a degree with the straightening of curved canals inherent in their preparation. Prepared straight canals displayed a continuously tapering form being narrowest at their end-point. On the other hand, prepared curved canals were invariably hourglass in shape. Under the conditions of this study the manipulation of K-files in a simple in/out filing motion proved an unsatisfactory method of preparing simulated curved root canals in resin blocks.

Dental Pulp Cavity↗
PubMed1990

Accuracy of impression materials measured with a vertical height gauge.

The objectives of this study were to introduce a different method for evaluating the accuracy of impression materials using a vertical height gauge, and to determine the vertical (axial) and horizontal (transversal) changes of four impression materials. Comparison of means demonstrated the changes for addition and condensation type silicones, and larger changes for the agar/alginate combination and the visible light cured (polyetherurethanedimethacrylate) impression material. The results were in agreement with an earlier study of the agar/alginate combination, and the values for the condensation and addition silicones were about half those reported in previous studies. These small changes might indicate the use of a mandibular stock tray for the upper jaw when a putty/wash technique is employed. The findings suggest that, when the horizontal changes (delta X) of impressions taken with a mandibular stock tray have a negative sign (contraction), then the vertical changes (delta L) will have a positive value (expansion), and vice versa. Thus the pattern of distortion can be formulated as delta X/delta L less than 0.

Agar↗
PubMed1993

Verifying the reliability of interchanging casts between Hanau Modular articulators.

PURPOSE: The purpose of this study was to test the Hanau Modular Articulator system with programmed fossae to determine its interchangeability. MATERIALS AND METHODS: Eight Hanau Modular Articulators were tested using the same measuring system as previously developed in a similar investigation on a different instrument. RESULTS: It was determined that the Hanau Modular System with programmed fossae did possess accuracy when a measuring device was transferred between the eight articulators tested. CONCLUSIONS: Laboratory procedures for multiple restorations can be accomplished with accuracy when master casts and mountings are transferred between Hanau Modular Articulators.

Dental Articulators↗
PubMed1983

Accuracy of stone-casts produced from selected addition-type silicone impressions.

The present study has shown that there is no correlation between the free curing contraction of three selected addition-type silicone impression materials and the effective contraction determined as the accuracy of stone dies produced in dental impressions of these materials. Depending on specific rheologic properties, the free curing contraction of an impression material can be partly compensated for by flow.

Calcium Sulfate↗