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Biomedical subjects

K Fueki

Publications and source records attributed to K Fueki.

9 recordsLinked to original sources
PubMed2003

A new and simple method for evaluating masticatory function using newly developed artificial test food.

The aim of this study was to develop an objective evaluation system for the masticatory function. This system used paraffin wax cubes as a test food, which had six red- and green-coloured layers so that each of the six surfaces showed a pseudo-checkered pattern. A total of 100 paraffin cubes were chewed by 37 subjects and the images of these samples were captured and analysed using a digital image analyzer. With regard to the colour and the shape of each sample, five parameters were obtained. Furthermore, an independent examiner graded the degree of colour mixing in the chewed samples into three groups (poor, medium and good) by visual inspection. A discriminant analysis was performed using the five variables as predictors of two groups (good and poor). Mixing Ability Index (MAI) was calculated from the discriminant function and using this index, 97% of the samples from these two groups were classified correctly. This system needed only a few minutes to complete and is easy to use. Therefore, it has high potentials for clinical use.

Adult↗
PubMed2003

Validity and reliability of a newly developed method for evaluating masticatory function using discriminant analysis.

The objective of the study was to assess validity and reliability of a newly developed method for evaluating mixing ability of masticatory function. A two-coloured paraffin wax cube was used as a test food in the mixing ability test. Eleven full dentate and 33 denture wearers participated in the validity assessment. They were divided into three groups according to their dental state. Validity was assessed by the Spearman's coefficient of correlations between the mixing ability test and the sieving method used as a 'gold standard' test of the masticatory performance. The subjects were asked to masticate the test foods for 5, 7, 10, 15, 20 and 30 strokes in each test. Significant correlations (P < 0.001) were obtained in natural dentition group (r(s) = 0.66), in denture-natural dentition group (r(s) = 0.72) and in denture-denture group (r(s) = 0.56). In the reliability assessment, three full dentate subjects were asked to repeat the mixing ability test a number of times. The intraclass correlation coefficients were 0.94 in interexaminer consistency, 0.98 in intra-examiner consistency, 0.89 in test-retest consistency and 0.99 in measuring consistency. These results indicated that the mixing ability test had the validity and the reliability for evaluation of the masticatory performance.

Adult↗
PubMed2003

Influence of working side contacts on masticatory function for mandibular distal extension removable partial dentures.

The aim of this study was to clarify the influence of working side contacts for masticatory function for a distal extension removable partial denture. Five subjects who had edentulous arches from second premolar to second molar opposing natural teeth participated. Working side contacts were altered by using three types of artificial teeth attached to the denture base. A-form teeth made contact with opposite teeth while acting as the working side in a lateral excursion. The cusp angles of B- and C-form teeth were decreased by 10 degrees and 20 degrees, respectively compared with A-form teeth. B-and C-form teeth discluded with opposite teeth on the working side. Subjects were asked to perform two kinds of masticatory performance test. Obtained data were evaluated by the repeated-measures anova and the Tukey test for multiple comparisons. Results revealed that there was a significant difference (P=0.001) in the three types of teeth in the mixing ability test and the value of A-form teeth was statistically less value than those of the other teeth. However, there was no significant difference in the comminuting ability test. These results suggested that working side contacts between artificial teeth and opposite natural teeth influenced mixing ability, but not comminuting ability.

Adult↗
PubMed2000

Influence of clenching level on intercuspal contact area in various regions of the dental arch.

The purpose of this study was to evaluate the relationship between the clenching level and the intercuspal contact area in different regions of the dental arch. Twenty-five healthy subjects with natural normal dentitions and good occlusal support performed clenching tasks in the intercuspal position at four different levels (10, 30, 70 and 100% levels of maximum voluntary contraction) through EMG visual feedback from bilateral masseter and anterior temporal muscles. Simultaneously, the occlusal contacts were recorded with a silicone occlusal contact checking material (Black Silicone, GC Dental Industrial Corp., Tokyo, Japan). The occlusal records were analysed by an image analyser. Every area of the thickness less than 50 microm was determined to be an occlusal contact area. The occlusal contact areas on the anterior teeth (incisors and canines), the premolars (first and second premolars) and the molars (first and second molars) were calculated separately. The posterior occlusal contact area increased with an increase in the clenching levels but that of the anterior did not. The results of this study indicate that the increase in clenching forces affects the anterior and posterior occlusal contact areas differently.

Adult↗
PubMed2000

Influence of protrusive tooth contact on tapping point distribution.

This study investigated the influence of protrusive tooth contacts (tooth contacts during mandibular protrusion) on the tapping point distribution. Nine healthy subjects volunteered for this study and the protrusive tooth contact pattern, as well as the retrusive tooth contact pattern, was altered on four maxillary occlusal splints. The first splint was adjusted to make the sagittal incisal path of protrusion and retrusion equivalent to that of the natural dentition. The second and third splints had partial and complete elimination of the protrusive tooth contact, respectively. The fourth splint had complete elimination of both protrusive and retrusive tooth contacts. The subjects were asked to use each splint continuously for 1 week. The tapping point distribution was measured on the 7th day after insertion of each splint. The four experimental occlusal conditions were found to have a significant effect on the tapping point distribution. The complete elimination of the protrusive tooth contact caused an anterior tapping point location and an increase in the tapping point area. The former tendency was found to be independent of the presence of the retrusive tooth contact. In conclusion, it was suggested that the protrusive tooth contact plays a significant role in maintaining the consistency and stability of the tapping point.

Adult↗
PubMed1985

[Experimental and clinical studies on operative methods of pancreaticojejunostomy in reference to the process of wound healing and postoperative pancreatic function].

After pancreaticoduodenectomy, the duct of residual pancreas is treated with ligation or anastomosed to jejunum. This study was carried out to determine whether or not pancreaticojejunostomy is necessary and if necessary, attempt was followed what kind of anastomosis is ideal from the view of wound healing, and reserving exocrine and endocrine function of the residual pancreas. Necessity for pancreaticojejunostomy: Forty mongrel dogs were divided into two groups: Group 1: Complete ligation of the pancreatic duct without anastomosis between the pancreas and jejunum. Group 2: Anastomosis between the jejunum and fibrotic pancreas which was caused by ligation of the pancreatic duct for three weeks. As results, even in fibrotic pancreas, pancreaticojejunostomy should be done after pancreaticoduodenectomy, to preserve exocrine and endocrine function of the residual pancreas. Operative methods of pancreaticojejunostomy: One hundred and twenty mongrel dogs were used to evaluate three kinds of pancreaticojejunostomy in terms of microangiography, hydroxyproline content, histopathological findings, bursting strength of the anastomotic site and incidence of anastomotic leakage. Pancreatic function was assessed by intravenous glucose tolerance test and pancreozymin secretin test. The best results were obtained by the anastomosis between mucosa of jejunum and pancreatic duct. Clinical application: The method of the anastomosis between the mucosa of the jejunum and pancreatic duct was applied to 142 patients with periampullary cancer from January 1971 to December 1982 at Keio University Hospital. Pancreatic leakage was seen in 10% (5/50) of patients with normal pancreatic tissue without pancreatic duct obstruction and did not occur in 40 patients with fibrotic pancreas.

Animals↗