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At least 793 records · Page 44Linked to original sources
PubMed2005

Apical leakage of resin based root canal sealers with a new computerized fluid filtration meter.

In this in vitro study, the apical leakage of three root-canal sealers: AH Plus, Diaket, and EndoREZ was evaluated using a new computerized fluid filtration meter. Forty-five extracted human premolar teeth with single root and canal were used. The coronal part of each tooth was removed and the root canals were prepared using GT Rotary files and crown-down technique. The roots were randomly divided into three groups of 15 samples, filled with one of the test materials and gutta-percha cones by the cold lateral condensation technique and were stored at 37 degrees C and 100% humidity for 7 days. One-week later, apical parts of roots of 10 +/- 0.05 mm were attached to computerized fluid filtration meter. Apical leakage quantity was determined as microl/cmH(2)O/min(-1). Statistical analysis indicated that root fillings with Diaket in combination with cold lateral condensation technique showed lower apical leakage than the others (p < 0.05). In addition, this new computerized fluid filtration meter allowed quantitative measurement of leakage easily. As it is a newly developed device to measure apical leakage of endodontic sealers, the reliability of it needed to be tested.

Bismuth↗
PubMed2006

Effect of resin coating on adhesion of composite crown restoration.

The purpose of this study was to evaluate the effect of a resin coating technique on the microtensile bond strength (microTBS) of resin cement to dentin in composite crown restorations. Crown preparations were done on human molars. A resin coating material, Hybrid Bond, was immediately applied to the prepared dentin and light-cured, while the tooth without resin coating acted as the control. An impression of the resin-coated tooth was taken, and a composite crown fabricated on the working cast. The composite crown was then bonded with a resin cement, Chemiace II. MicroTBSs were measured at a crosshead speed of 1 mm/min, and the resin-coated group yielded significantly higher microTBSs than the non-coated group (p < 0.05). In terms of microTBS values between the axial and occlusal surfaces, no regional differences in resin-dentin bond strength were detected (p < 0.05). It was concluded that resin coating with Hybrid Bond significantly improved the microTBS of resin cement to dentin in composite crown restorations.

Analysis of Variance↗
PubMed1989

Reduction in tooth stiffness as a result of endodontic and restorative procedures.

Endodontically treated teeth are thought to be more susceptible to fracture as a result of the loss of tooth vitality and tooth structure. This study was designed to compare the contributions of endodontic and restorative procedures to the loss of strength by using nondestructive occlusal loading on extracted intact, maxillary, second bicuspids. An encapsulated strain gauge was bonded on enamel just above the cementoenamel junction on both the buccal and lingual surfaces, and the teeth were mounted in nylon rings leaving 2 mm of root surface exposed. Under load control, each tooth was loaded at a rate of 37 N per s for 3 s and unloaded at the same rate in a closed loop servo-hydraulic system to measure stiffness. A stress-strain curve was generated from each gauge prior to alteration of the tooth and after each procedure performed on the tooth. Cuspal stiffness, as a measure of tooth strength, was evaluated on one of two series of sequentially performed procedures: 1. (a) unaltered tooth, (b) access preparation, (c) instrumentation, (d) obturation, and (e) MOD cavity preparation; or 2. (a) unaltered tooth, (b) occlusal cavity preparation, (c) two-surface cavity preparation, (d) MOD cavity preparation, (e) access, (f) instrumentation, and (g) obturation. Results on 42 teeth indicate that endodontic procedures have only a small effect on the tooth, reducing the relative stiffness by 5%. This was less than that of an occlusal cavity preparation (20%). The largest losses in stiffness were related to the loss of marginal ridge integrity. MOD cavity preparation resulted in an average of a 63% loss in relative cuspal stiffness.(ABSTRACT TRUNCATED AT 250 WORDS)

Analysis of Variance↗
PubMed2003

The effect of magnification on the iatrogenic damage to adjacent tooth surfaces during class II preparation.

OBJECTIVES: To determine the amount of damage to adjacent surfaces during cavity preparation of approximal box-cavities by using either no magnification or an individually adapted surgical telescope. MATERIALS AND METHODS: Nine dentists prepared in a mannequin head 4 approximal (class II) box-cavities without magnification using a high speed handpiece with lighting from a dental unit. At least 2 months later the test was repeated with a surgical telescope system with integrated light. The degree of damage the 72 adjacent surfaces suffered was determined. RESULTS: The average time needed to prepare one cavity was 14.9min without and 18.3min with magnification (p=0.01). Altogether, 29.7% of adjacent area were damaged when no surgical telescopes were used and 34.5% when surgical telescopes were applied (p>0.05). When the mesial-facing and distal-facing surfaces were analysed independently a statistically significant increase of damage was found on distal surfaces (p=0.03) when using surgical telescopes. Seventy surfaces (=97%) had a preparation trauma. CONCLUSIONS: Surgical telescopes do not decrease damage of adjacent tooth surfaces.

Adult↗
PubMed1998

The emotional effects of tooth loss in edentulous people.

AIM: To explore the range of reactions to, and feelings about, tooth loss. METHOD: In this qualitative study, 50 edentulous people undergoing routine prosthetic dental care were interviewed privately using a reflexive, in-depth technique. All the interviews were tape-recorded and transcribed. The transcripts were scrutinised to identify the common themes related to tooth loss. Interpreter bias was minimised by two researchers scrutinising the transcripts independently. RESULTS: The participants had a mean age of 69.9 years (range 51 to 86) and had been edentulous for a mean of 18.4 years (range 0.25 to 57 years). The main themes identified in reaction to tooth loss were: bereavement, lowered self-confidence, altered self-image, dislike of appearance, an inability to discuss this taboo subject, a concern about prosthodontic privacy, behaving in a way that keeps the tooth loss secret, altered behaviour in socialising and forming close relationships, premature ageing, and lack of preparation. CONCLUSION: Tooth loss can be disabling and handicapping. It has a profound impact on the lives of some people, even those who are apparently coping well with dentures. The profession needs to consider how it can prepare people for the effects of tooth loss.

Adaptation, Psychological↗