摘要:

Heløe, B.&Heløe, L.A. The occurrence of TMJ-disorders in an elderly population as evaluated by recording of»subjective«and»objective«symptoms.Acta Odont. Scand. 36, 3–9The Occurrence of»objective«symptoms of TMJ-disorder, as measured by clinical examination, and self-reported»subjective«symptoms, were investigated in a survey of 241 persons aged 65-79. This group constituted the participants of a sample which was drawn to cover all persons in this age category living in the county of Troms in Norway. The participation rate was 86. Participants were examined and interviewed by dentists in graduate training.Eight per cent of the group reported to have had TMJ pain recently. Fourteen per cent said they had clicking or crepitation. These symptoms were twice as commonly reported by women as by men, and they were also most frequent among people complaining of rheumatism or general joint pain. By the clinical examination, clicking and/or crepitation was found h 27% of the individuals. Limitation of jaw movement was registered in only 3 persons. These»objective«symptoms were evenly common with both sexes. Dental/prosthetic status had seemingly no distinct influence of the findings.

ISSN:0001-6357    

DOI:10.3109/00016357809026360

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Forsten, L. Marginal leakage and consistency of the composite resin material in etched cavities.Acta Odont. Scand. 36, 11–13The purpose of the study was to evaluate the degree of adaptation of undiluted and diluted composite resin to etched enamel walls with and without an intermediary resin. Cavities (Ø+ 2 mm) were drilled in extracted teeth and the walls were etched with phosphoric acid. Fillings were made of Concise®composite resin, without applying an intermediary resin (l), after applying the resin layer (2), after diluting the mix with one (3) or two (4) drops of catalyst resin but without an intermediary resin, and after diluting the mix and applying the resin layer (5). The fillings were ground flush with the tooth surface and the teeth were cycled thermally between two dye solution baths. The marginal penetration of the dye was evaluated by measuring the discoloured portion of the margin at different depths using a stereomicroscope. The restorations with an intermediary resin (2 and 5) exhibited significantly less leakage than fillings without the intermediary layer (1, 3 and 4). When no resin layer was applied the dilution of the mix seemed to reduce the leakage compared with undiluted material but the differences were not statistically significant. The results indicate the advantage of using an intermediary resin with etching even when the composite is diluted.

ISSN:0001-6357    

DOI:10.3109/00016357809026361

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Tveit, A.B.&Hals, E. Penetration of ions from silicate cement restorations into Copalite©-covered cavity walls.Acta Odont. Scand. 36, 15–24This study aimed to assess the effect of silicate cement on Copalite®-covered cavity walls in extracted human teeth. Class V cavities were prepared in 24 premolars and filled with silicate cement (Bio-Trey®). Four cavities were unlined, the rest of the cavities were lined with 1 or 2 layers of Copalite before insertion of the restorations. After 6 months, 70-100μm thick longitudinal sections of the teeth were studied by polarized light microscopy, microradiography and electron probe microanalysis. When imbibed in water or quinoline, a subsurface zone of altered birefringence was noticed in nearly all cavity walls. Nearly half of the cavit walls in the experimental groups showed a surface zone of increased radiopacity. In a few instances a subsurface radiolucent zone was present. By electron probe microanalysis F (0,4-3% by weight), Zn (14%) and Al (0,2-6%) were measured in the outer 10–60μm of the cavity walls. The study shows that even with a double layer of Copalite, known to prevent microleakage, a desirable uptake of F and A1 from silicate restorations into cavity walls can take place. Copalite does not prevent a phosphoric acid effect on the cavity walls.

ISSN:0001-6357    

DOI:10.3109/00016357809026362

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Duterloo, H.S.&Vilmann, H. Translative and transformative growth of the rat mandible.Acta Odont. Scand. 36, 25–32The growth of the rat mandible was studied during a period from 14 to 30 days of age.Roentgencephalometric and alizarin vital staining techniques were employed. Growth in length doubles the growth in breadth; the angle between the mandibular halves decreases slightly. Bone remodeling patterns were revealed with the alizarin technique. Posteriorly facing surfaces and the anterior end of the incisal process show apposition. Lateral facing surfaces of the posterior part of the mandibles were resorptive. A medio-posterior growth direction of these parts was found. The intermandibular articulation plays no role in the translative growth movements, in contrast to other articulations between skull bones as sutures and synchondroses, but serves primarily during biting and chewing.The authors acknowledge the technical assistance of Dr. H.W.B. Jansen, Laboratory for Craniofacial Growth and Development, University of Groningen, and Mrs. Helle Meile, Royal Dental College, Copenhagen. Drawings are made by Chris Lingemans; the manuscript was prepared by Marga van Dijken.

ISSN:0001-6357    

DOI:10.3109/00016357809026363

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Helkimo, E. Carlsson, G.E.&Helkimo, M. Chewing efficiency and state of dentition.Acta Odont. Scand. 36, 33–41Chewing efficiency, defined as the ability to grind a certain portion of a test food during a given time, was tested in 139 Skolt Lapps, aged 14–65. 94 persons had natural teeth and the remaining 45 wore dentures (partial and/or complete). The test food was almonds. Number of chewing strokes, swallowings and chewing time was denoted. The chewing efficiency was classified after a scale from 1 to 5 where 1 meant very good and 5 very poor ability to reduce the particle size of the test food. Clear associations were found between chewing efficiency and dental state. Number of occluding pairs of teeth was closely correlated with chewing efficiency and individuals with less than 20 teeth had a higher index score than those with more than 20 teeth. The values noted for number of chewing strokes, swallowings and chewing time were smaller for those with a good chewing efficiency, but the variation was not linear and not always significant. Denture wearers had statistically significantly higher chewing efficiency score than those with natural teeth, without dentures, and needed more chewing time before swallowing.

ISSN:0001-6357    

DOI:10.3109/00016357809026364

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Asmussen, E.&Dreyer JØrgensen, K. The stability of water in the pores of acid etched human enamel.Acta Odont. Scand. 36, 43–44A mechanism is proposed, explaining the fact that drying by compressed air for 5–10 sec. will remove acid and dissolved enamel from the relatively long and narrow pores of etched enamel surfaces. It is a consequence of the proposed mechanism that water in the liquid state is not stable in the pores, and accordingly, that condensation of water vapour on the etched and dried surfaces is not likely to occur. This was confirmed by studying tag formation in etched enamel surfaces under conditions where water vapour will condense on unetched tooth surfaces.

ISSN:0001-6357    

DOI:10.3109/00016357809026365

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

Baa, G.&Espevik, S. Stress/strain behavior of some dental luting cements.Acta Odont. Scand. 36, 45–49The compressive strength, modulus of elasticity and the plastic strain at fracture have been studied for several dental luting cements. Stress/strain diagrams of cylindrical specimens using two different crosshead speeds (2 mm/min and 0. 1 mm/min) at 23°and 37°C showed that large differences existed between various luting cements.A zinc phosphate cement exhibited high strength, high modulus of elasticity and a small plastic strain at fracture. A resin cement also had high strength, but elastic and plastic strains were high. A polycarboxylate and an EBA-cement both showed low values of strength and modulus of elasticity combined with a high degree of plastic deformation at fracture. Testing with low strain rate at 37°C accentuated the differences between these two materials and the zinc phosphate cement.

ISSN:0001-6357    

DOI:10.3109/00016357809026366

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor

摘要:

SjÖgren, S., Bawden, J., HammarstrÖm, L.E.&Larsson,Å. No demonstrable accumulation of14C-vitamin D3in developing rat teeth and bones.Acta Odont. Scand. 36, 51–55The distribution of14C-vitamin D3administered subcutaneously in arachidic oil to 6-day-old suckling rats has been examined autoradiographically. The animals were sacrificed 1,2,4 and 8 days after injection. The autoradiographic exposure time was 4 months. The sectioning and exposure was performed in a freeze-room. Radioactivity was found mainly in the liver, kidney, intestines and fat depots. No uptake was found in developing teeth or bones.

ISSN:0001-6357    

DOI:10.3109/00016357809026367

出版商:Taylor&Francis    

年代:1978

数据来源: Taylor