Biomedical subjects

G Goto

Publications and source records attributed to G Goto.

At least 55 records · Page 3Linked to original sources

PubMed1989

[Resin adhesion to the ground enamel. Influence of the ground depths of the enamel and etching times (1)].

The purpose of this study was to investigate the influence of the ground depths of the enamel and etching times on the adhesion of the resin on the ground enamel. Seventy-five extracted and frozen bovine mandibular young permanent incisors were used. The etchant used in this study was 40% phospholic acid gel and the etching times were 0, 10, 20, 30 and 60 seconds. All of the specimens were washed with an air water spray for 30 seconds after etching. The bonding agent and composite resin used in this study were Photo Bond and Photo Clearfil A (Kuraray Co.). Shear bond strengths to the outer enamel layers and inner enamel layers of the same teeth were measured. After the shear bond strength test, all the test surfaces of the enamel and resin specimens were observed using the SEM. The following conclusions were obtained. 1) The etching times which showed the highest bond strength were 20 seconds on the outer enamel layers (bond strength: 35.25 +/- 6.60 MPa) and 30 seconds on the inner enamel layers (bond strength: 40.15 +/- 6.59 MPa). 2) When the enamel was etched with all of the etching times, the bond strengths were significantly higher than those of the enamel without etching on the outer and inner enamel layers. 3) In the etched groups, significant differences between the bond strengths were not obtained among the different etching times on the outer and inner enamel layers. 4) In the comparison of the bond strengths between the outer enamel layers and the inner enamel layers, the bond strengths of the inner enamel layer were higher than those of the outer enamel layer with 0, 10, 30 and 60 seconds of etching times. However, a significant difference between the bond strengths was obtained only in the cases with 30 seconds of etching time. 5) In the etched groups, such a tendency toward a higher bond strength was observed in cases which showed poor enamel prism structures and poor resin tags, and resin widely adhered on the enamel surface. 6) Thirty seconds is a sufficient time for etching on the ground young permanent enamel using Photo Bond and Photo Clearfil A.

Acid Etching, Dental↗

PubMed1989

[The state of the recall visit at the pediatric dentistry clinic of Nagasaki University Dental Hospital].

The purpose of this study is to discover the actual condition and the state of the recall visit of the patients who appeared at the Pediatric Dentistry Clinic of Nagasaki University Dental Hospital, and to compare the results of 1987 and 1985. Concerning the making of appointments for the recall visit, we sent cards to patients in 1987 though, in 1985 we did not send cards to the patients so the patients themselves had to make a telephone call to arrange an appointment. The results were as follows: 1) The rate of the patients who were making their first time recall visit increased by means of sending cards to patients. 2) Of the total number of 493 patients who appeared at our clinic in 1985, 127 (25.8%) did not finish their dental treatment and stopped visiting our clinic for treatment. 3) The rate of the patients who finished their dental treatment and were making the first time recall visit was 69.9% in 1987. 4) The average ages of the patients were 6 years 5 months in 1987 and 5 years 6 months in 1985. The lower the age of patients, the higher the rate of the recall visits, while the rate of pre-school children was higher than that of school children. 5) The rate of the patients who finished their dental treatment and made recall visits was higher in cases in which the chief complaints of the first visit were caries prevention (86.2%) and caries treatment (71.3%) than the cases of tooth extraction (50%), tooth shape anomalies (50%) and tooth pain (50.5%). 6) There was no significant difference in the number of caries decayed teeth at the first oral examination between the group of patients making their first recall visit and the group of patients rejecting a recall visit. 7) In the case of the patients to whom space retainers and orthodontic appliances were applied, the rate of making recall visits decreased more in 1987 than that of 1985. 8) There was no difference in the rate of those making their first time recall visit between the two categories of diseased children and nondiseased children.

Appointments and Schedules↗

PubMed1988