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At least 19 recordsLinked to original sources
PubMed1992

Retained "hopeless" teeth: lack of effect periodontally-treated teeth have on the proximal periodontium of adjacent teeth 8-years later.

We previously reported the lack of effect periodontally-treated teeth prognosed "hopeless" and retained for 3.4 +/- 1.5 years have on the proximal periodontium of adjacent teeth. We now report our findings for the same group of subjects following 8.4 +/- 0.7 years of "hopeless" tooth retention. Of the 17 "hopeless" and adjacent teeth originally measured in 17 subjects, 14 of the subjects were still available for re-evaluation. Measures used to assess the periodontium of proximal surfaces of adjacent teeth included pocket depths (PD), radiographic alveolar bone level (R-BL), and periodontal ligament space width (W-PL). Treatment for the subjects consisted of surgical therapy (N = 15) and scaling and root planing (N = 2). Of the 14 subjects re-examined, 2 were eliminated due to loss of adjacent tooth reference points and 2 due to extraction of the "hopeless" tooth (N = 10). Differences in measurements (i.e., nonadjacent to "hopeless" tooth value minus adjacent to "hopeless" tooth value) were analyzed using a repeated measures ANOVA. There were no significant differences for PD (P = 0.20), R-BL (P = 0.29), or W-PL (P = 0.16). These data confirm our original findings that retained periodontally "hopeless" teeth do not significantly affect the proximal periodontium of adjacent teeth following therapy.

Alveolar Bone Loss↗
PubMed1990

[Teeth arrangement of anterior artificial teeth. 1. Age and teeth exposure].

In selecting and arranging anterior artificial teeth for edentulous patients, it is necessary to consider their sex, personality, age and other factors. The relation of upper and lower lip lines to incisal edge has been one of the standards for the selection and the arrangement of anterior artificial teeth. The purpose of this report was to establish and to evaluate decision bases for the selection and arrangement. We recorded and measured the exposure rate of anterior natural teeth (48 men, 46 women) during function, such as smile, pronunciation, by means of the image analysis. Following results were obtained. 1. As the age of patients increased, upper anterior teeth appeared less than lower's. 2. Differences in exposure ratio between upper and lower teeth were found more remarkable in smiling rather than in pronunciation.

Adult↗
PubMed1995

[Deciduous tooth intrusions and the odontogenesis of the permanent teeth. Developmental disorders of the permanent teeth following intrusion injuries to the deciduous teeth].

Traumata to primary teeth occur very often in small children. The highest prevalence of developmental disturbances of permanent teeth after trauma to their predecessors has been recorded after intrusive injuries of primary teeth. In the present survey 47% of the recalled children had such developmental disturbances. The majority of developmental disturbances consisted of enamel hypoplasia (59%) which included discoloration, defects or a combination of both. In some cases the clinical feature of enamel defects could be diagnosed radiographically before tooth eruption. However, the total number of all enamel discolorations was to be detected after complete tooth eruption only. The so-called pre-eruptive calciotraumatic lines on radiographs corresponded clinically to circular enamel defects or crown dilacerations. Generally, a high correlation was found between the degree of intrusion (of the primary tooth) and the frequency and severity of developmental disturbance (of the permanent tooth). No correlation was found, however, concerning the treatment of intruded primary teeth and the occurrence of developmental disturbances. Whether intruded primary teeth were removed immediately or left to spontaneous re-eruption did not affect the incidence and type of developmental disturbances.

Child↗
PubMed1992

Wear of denture teeth by use of metal plates. Part 3: Abrasive wear of posterior teeth and wear of opposing metal plates.

An in vitro evaluation of abrasive wear resistance of high-strength denture (HS) teeth and wear of metal plates (Pd alloy) on the opposing side was conducted. A total of 8 types of teeth were used in the experiments including 3 types of HS teeth, 3 types of conventional plastic denture (PL) teeth, porcelain teeth and metal teeth (Pd alloy). Sliding-induced wear tests were conducted by sliding these teeth over the metal plates. Abrasive wear resistance of the teeth was evaluated in terms of wear depth and weight loss. A comparison of wear depth showed that the abrasive wear resistance of HS teeth was 4.7 times that of PL teeth, 0.7 times that of porcelain teeth and 8.3 times that of metal teeth. Weight loss showed that the abrasive wear resistance of HS teeth was 3.3 times that of PL teeth, 0.2 times that of porcelain teeth and 11.4 times that of metal teeth. The weight loss of the metal plates was minimal when they slid over HS teeth, but increased in the order PL teeth, porcelain teeth and metal teeth.

Dental Alloys↗
PubMed1996

Missing teeth and lost teeth of adults aged 30 years and over in south-western Finland.

The majority of Finnish adults have lost one, some or all of their teeth. The prosthetic replacement of missing teeth has thus been an important element of adult dental care. However, there have been no longitudinal studies focusing on the development of oral health among the Finnish adult population in terms of further tooth loss. A baseline sample from 1977-78 was selected from the city of Turku to represent the adult population aged 30 years and over. Ten years later, a follow-up examination was carried out on this baseline study group. A new sample of persons aged 30-39 years was also obtained to provide cross-sectional information, allowing comparisons between this study group and the youngest age-group of the 1977-78 study. In 1977-78, 52 per cent of all subjects had 20 or more remaining teeth. The mean number of missing teeth was 15.8 (SD 11.05) and the corresponding median 12 teeth. The number of missing teeth was on average higher in the older age-groups (P < 0.001). Women had more missing teeth than men (P < 0.01). In the ten-year follow-up study, the mean number of lost teeth was 1.5 (SD 2.32) and the median one tooth. The average number of lost teeth increased with age (P < 0.01). The rate of tooth loss was highest for those with 10 to 19 teeth at baseline, second highest for those with one to nine teeth and lowest for those with 20 to 32 teeth (P < 0.001). The reasons most often reported for tooth extraction were tooth mobility, pain and prosthetic treatment. In the cross-sectional study groups of persons aged 30-39 years, the proportion of subjects with a complete natural dentition of 28 to 32 teeth was 63.4 per cent in 1989, compared with 40.0 per cent ten years earlier. The average number of missing teeth was lower in 1989 than in 1977-78 (mean 4.7, SD 3.81 vs. mean 7.8, SD 6.92; P < 0.001). In both cross-sectional examinations women had a higher mean number of missing teeth than men. However, the difference between the genders was statistically significant only in 1977-78 (P < 0.01). Among the age-group of 30-39 years, there has been a considerable improvement in retention of natural teeth during the ten-year interval. However, among the middle-aged and elderly population reduced dentition was common; in addition, extraction was still used as a dental treatment especially among persons with reduced dentition. This suggests that the need for prosthetic replacement of lost teeth will continue to play a role in adult dental care in Finland for some decades to come.

Adult↗
PubMed1990

Wear of artificial denture teeth by use of toothbrushes. Part 1: Abrasive wear of anterior teeth.

High-strength denture teeth (HS teeth) were developed in order to improve the hardness and wear resistance of conventional plastic denture teeth (PL teeth), while retaining their feature of easy occlusal adjustment. The objective of this study was to evaluate the abrasive wear resistance of HS teeth. We conducted wear tests and measured surface roughness using six types of anterior artificial teeth, i.e., three types of HS teeth and three types of PL teeth, the latter serving as the control. The results of the toothbrush abrasion test revealed that the HS teeth had about 5 times greater wear resistance than the PL teeth. It was also found that the type of artificial teeth and the number of abrasive wear-testing strokes had a significant (P less than 0.05) influence on the surface roughness of artificial teeth.

Dental Stress Analysis↗
PubMedDate not supplied

Bonding durability of conventional resinous denture teeth and highly crosslinked denture teeth to a pour-type denture base resin.

PURPOSE: The study examined the bond strength between 2 types of resin denture teeth and a pour-type denture base resin after thermocycling. The denture teeth were untreated, prepared with diatorics, or treated with a solvent, dichloromethane. MATERIALS AND METHODS: Conventional denture teeth and crosslinked denture teeth were bonded to a pour-type denture base resin. Compressive load was applied at 45 degrees on the palatal surface of each tooth until fracture. The teeth were either thermocycled or not thermocycled. Porcelain teeth were also tested for comparison. RESULTS: There was no significant difference in bond strength between the conventional resin teeth and the crosslinked denture teeth. Thermocycling significantly decreased the bond strength of the 2 types of resin teeth but had no effect on porcelain teeth. The application of dichloromethane significantly improved the bond strength of the 2 types of resin teeth either before or after thermocycling. CONCLUSION: It is recommended that dichloromethane be applied on the denture teeth ridge-lap area prior to denture base processing.

Analysis of Variance↗
PubMed1989

[Changes on pronunciation using the removal appliance for children with early loss of deciduous teeth. Comparison between good occlusion children with missing anterior-posterior deciduous teeth].

The purpose of this study was to examine missing anterior teeth and posterior teeth for possible differences according to the where the teeth were missing site, a comparison was made between children with such defects and those with relatively good occlusion. The following results were obtained: 1. Compared with children with missing anterior teeth, children with missing posterior teeth showed more differences in the frequency range for vowel formants from those with relatively good occlusion. 2. As for vowel formant, missing anterior teeth and missing posterior teeth presented more such differences for formant i and formants i and e, respectively. 3. For each formant, more such differences were noted for the first formant and the third formant compared with comparatively fewer such differences noted for the second formant. 4. In terms of the strength of voice components in each frequency range, consonant pronunciation rather than vowel pronunciation proved to be influenced by missing either anterior or posterior teeth. 5. For vowel pronunciation, more such differences were noted at low to intermediate frequency ranges. 6. Pronunciation of words containing the letter t and k tended to be improved for missing anterior and posterior teeth, respectively, but pronunciation proved to be improved in a difficult manner. The above results revealed that compared with missing anterior teeth, missing posterior teeth presented more differences from children with relatively good occlusion, suggesting that not only space maintenance and masticatory function but also speech function must be considered in preparing the removal appliance for missing posterior teeth of children.

Articulation Disorders↗
PubMed1992

Wear of denture teeth by use of metal plates. Part 2: Abrasive wear of posterior teeth.

An in vitro study was conducted to evaluate the abrasive wear resistance of high-strength denture teeth (HS teeth). Eight types of specimen were used in the experiments; 3 types of HS teeth, 3 types of conventional plastic denture teeth (PL teeth), porcelain teeth and metal teeth. Sliding-induced wear tests were conducted by sliding the samples on a metal plate. The abrasive wear resistance of the samples was evaluated in terms of wear depth, weight loss and SEM observation. Comparison of wear depth showed that abrasive wear resistance of HS teeth was 4.7 times that of PL teeth, 0.7 times that of porcelain teeth and 8.3 times that of metal teeth. In terms of weight loss, the corresponding values were 3.3-fold, 0.2-fold and 11.4-fold, respectively.

Dental Porcelain↗
PubMed1990

[Strength of teeth to fracture by impact. Testing of fractural strength against impact force, using replication models of human permanent teeth].

Traumatic injury anterior teeth is often encountered clinically. A number of clinical and statistical studies have so far been undertaken for the incidences, causes and ages in terms of the site of fracture. However, little has been attempted at fundamental estimation of the fractural resistance of anterior teeth that are susceptible to fracture. This has been studied in only an erect position of eruption by Nose or Chin. Changes in resistance of teeth in a twisted position or at different angles of eruption still remain unstudied. We took an interest in the relation between physicopositional conditions of human teeth and changes in their fractural strength against impact. Determination of the resistance of teeth to a variety of experimental conditions was attempted by use of an Izod-type tester. Epoxy resin replication models of human anterior teeth were used as experimental specimens, since human teeth were considered inappropriate because of their large individual differences and an anticipated difficulty in precise reproduction of the angles of eruption and torsion. The following results were obtained; (1) In the replication models of teeth erected positioned at 90 degrees vertically to the horizontal plane, the fractural strength against impact was highest for the maxillary cuspid model and was lowest for the mandibular central incisor model. (2) In the replication models of teeth with their mesial or distal incisal margin twisted 45 degrees medially, the fractural strength was reduced for all the teeth except the maxillary central incisors. (3) In comparison of the strength between the replication models with the mesial incisal margin twisted 45 degrees medially and those with the distal incisal margin twisted likewise am marked reduction in strength was found for the maxillary cuspid model prepared in the former condition of torsion. For the mandibular cuspid model, a relatively large reduction of the strength was found in the latter condition of torsion. (4) In comparison of the strength of teeth positioned at various angles, the strength was decreased by slanting either labially or lingually for all the replication models except the maxillary and mandibular cuspid models.

Cuspid↗
PubMed1999

Inflammatory and replacement resorption in reimplanted permanent incisor teeth: a study of the characteristics of 84 teeth.

Avulsion is a serious injury which can cause damage to some or all of the dental and surrounding tissues. This study examined the profiles of teeth showing inflammatory resorption, in terms of time prior to reimplantation, contamination, pulp extirpation time and period of splinting and compared them to teeth without resorption. There were a total of 71 children in the present study (mean age 9.8 years, range 6-16 years) with a total of 84 reimplanted teeth. Inflammatory resorption was present in 22 teeth. There was a significant relationship between the presence of inflammatory resorption and the time the teeth were dry prior to reimplantation, with a lesser effect for total delay time. There were slightly later pulp extirpation times for teeth with inflammatory resorption, with median delays of 16 and 11 days respectively and increased inflammatory resorption in teeth extirpated at 20 days or later. Replacement resorption was present in 40 teeth. There was a significantly longer splinting time in teeth with replacement resorption and more resorption in teeth splinted for longer than 10 days. It was concluded that pulp extirpation time was not critical unless the delay exceeded 20 days and that splinting time should not exceed 10 days.

Adolescent↗
PubMed1993

Composite indicators of dental health: functioning teeth and the number of sound-equivalent teeth (T-Health).

This study investigated whether two new composite dental indicators--"the number of functioning teeth" and "the number of sound-equivalent teeth"--are more efficient than the conventional DMFT index in revealing the social and behavioural factors which are significantly related to oral health status. The arbitrary set of weights given to the T-Health indicator was also evaluated. The number of functioning teeth was defined as the aggregate of filled (otherwise sound) and sound teeth. The T-Health was defined as a weighted average of sound teeth, filled (otherwise sound) teeth and teeth with some decay, the weights intended in principle to represent the relative amounts of sound tissue in these three categories of teeth. An arbitrary set of weights was used: 4, 2, and 1 for sound, filled, and decayed teeth, respectively. 164 families (father, mother and at least one 13-yr-old child) from Belo Horizonte, Brazil, were randomly selected from 13-yr-old children from private and state schools. The parents' ages ranged from 35 to 44 yr. Socio-economic status, area of residence, level of education, family income, sugar consumption, toothbrushing frequency and type of dental attendance were the social and behavioural oral health risk-factors considered in this study. The results indicated that the two new dental indicators are more sensitive to the influence of social and behavioural factors, such as those investigated here, than is the traditional DMFT index. A different set of weights (4, 1, and 1 for sound, filled, and decayed) was suggested for the construction of the T-Health.

Adolescent↗
PubMed1991

Prevalence of apical periodontitis, crowned teeth and teeth with posts in a Swedish population.

A longitudinal radiological study was carried out of 200 consecutive patients in a Swedish population. The aims of the investigation were to study the prevalences of crowned teeth, pontics and posts on two occasions with an interval of 5-7 years and, furthermore, to study apical periodontitis in connection with teeth with crowns and posts to see if such treatments affected this prevalence. 417 (mean 2.1) teeth were crowned at the first examination and 529 (mean 2.6) at the second. For pontics, the corresponding figures were 93 (mean 0.5) and 141 (mean 0.7). Crowns and pontics were more common in the upper jaw. 59.4% of the endodontically treated teeth had posts at the first examination and 64.4% at the second. 34.5% of the 255 teeth with apical periodontitis found at the first examination and 41.0% of the 268 at the second were in connection with posts. It was concluded that both crowns and pontics were common treatment procedures in the studied population. Crown therapy did not seem to impair the apical status while teeth with posts more often had apical periodontitis than other teeth and, furthermore, teeth with screw posts were lost more frequently than other teeth.

Adult↗
PubMed1988

Retained "hopeless" teeth. Effects on the proximal periodontium of adjacent teeth.

The retention of teeth diagnosed as periodontally "hopeless" may accelerate the destruction of the adjacent proximal periodontium. Studies determining the influence these teeth have on the health status of adjacent teeth appear nonexistent. It was the intent of this retrospective study to assess the status of the periodontium in adjacent teeth proximal to the periodontium of "hopeless" teeth. We evaluated 17 teeth, each being mesially adjacent to one "hopeless" tooth, in 17 subjects treated for periodontal disease. In each case, the "hopeless" and the adjacent teeth received the same treatment. Probing depths (P-D), radiographic alveolar bone level (R-BL) and the width of the periodontal ligament space (W-PL) were measured for both the adjacent interproximal and the nonadjacent interproximal surface for each hopeless tooth. At both pretherapy and posttherapy, there were no significant differences for any of the variables (P-D, R-BL and W-PL) for the adjacent interproximal surfaces with the nonadjacent interproximal surfaces. However, there was a significant reduction in the mean probing depth for the adjacent interproximal surfaces, pretherapy to posttherapy. No other significant changes were found in any of the other variables for either the adjacent or nonadjacent interproximal surfaces. These data suggest that teeth considered periodontally "hopeless" and retained have no effect on the proximal periodontium of adjacent teeth prior to and following therapy.

Bone Resorption↗
PubMed1990

[A consideration of determining the removal or retention of teeth in the patient with a few remained teeth].

The alveolar bone of edentulous ridge is resorbed after the teeth extraction and the subsequent denture insertion. For the periodontal structure, the stress transmitted along the longitudinal axis is favorable, but the horizontal stress is destructive. Under the overdenture application which the retained teeth have the reduced clinical crown, it is possible to prevent the alveolar bone resorption and to improve the involved teeth. However it is difficult for the inclined teeth to get the successful results. In a case, having a few remained teeth contained the embedded root stump and the overdenture being applicated, we obtained the suggestion as follows. 1. Also the embedded root stump is useful to prevent the alveolar bone resorption. 2. The top and direction of longitudinal axes of the inclined abutment teeth can be determined by means of surveying the least teeth movement when the stress was applied to the teeth by the fingers with dental pincette. 3. Also to the inclined abutment teeth, it is possible to transmit the stress along the longitudinal axes, when the overdenture has the contact with the short dome coping at the top and in the inferior area to the longitudinal axes inclined, and is relieved in the superior area to its axes.

Alveolar Bone Loss↗
PubMed1990

[Multiple impaction teeth. Clinical and radiological study in patients with three or more impacted teeth].

The cause, the frequency, the complications and the surgical operation of impacted teeth is always an interesting subject of study and research. The purpose of this investigation was to determine the frequency and the kind of the teeth in the multiple impaction to Greek population. The material of this study was 1740 Greek (870 men and 870 women) over 20 years old. The results were: The percentage of patients with three or more impacted teeth was 11.37%. The 45.96% of these patients had 4 impacted teeth (P less than 0.0001), the 33.84%) had only 4 impacted wisdom teeth and 40 patients (20.20%) three. In the 53.03% of the cases presented only 3 or 4 impacted wisdom teeth and in the 30.81% of the cases 2 impacted wisdom teeth and other impacted teeth. The greatest percentage (82.83%) of the cases of multiple impactions comes from different impacted teeth. The greatest percentage (71.21%) of cases of multiple impactions was found in the posterior region of the jaws.

Adult↗
PubMed1979

A radiographic evaluation of the response of previously avulsed teeth and partially avulsed teeth to orthodontic movement.

Orthodontic movement, as documented in this study, can be accomplished successfully in the case of completely avulsed and partially avulsed teeth which have been reimplanted. These teeth respond to normal orthodontic forces and duration of treatment time by conventional orthodontic techniques and retention. Apical root resorption does occur more readily in these teeth before, during, and after orthodontic treatment. Six of the eighty-one involved teeth were lost because of complete root dissolution. The involved teeth which were reimplanted immediately without pulpal treatment and their integrity protected as living tissue were successfully treated orthodontically with no known losses as of this writing. It will be interesting to observe the tissue response of these avulsed teeth in the years ahead. How will time and circumstances deal with these teeth?

Adolescent↗
PubMed1985

Determining approximate size of maxillary anterior artificial teeth when mandibular anterior teeth are present. Part I: Size relationship.

Three methods were used to obtain a ratio of the maxillary to the mandibular anterior teeth, with results of 1.29, 1.30, and 1.31. It can be concluded that a ratio of 1.30 is sufficient to determine the approximate width of the six maxillary anterior teeth when given the size of the mandibular natural anterior teeth. This ratio should be valid to select a maxillary denture mold of sufficient width mesiodistally to obtain a Class I canine relationship. However, the ratio may need a slight adjustment to compensate for the intentional disocclusion of the maxillary denture teeth with the natural mandibular teeth. In Fig. 1 the canine to canine measurement of the mandibular anterior teeth was 35 mm; when multiplied by a factor of 1.30, a maxillary measurement of 45.5 mm is obtained. The denture teeth were to be set with approximately 1 mm of horizontal overjet and 1 mm of vertical overlap (Fig. 2), therefore a slightly larger mold of 48.5 mm was chosen (Fig. 3). This maxillary mold produced a Class I canine relationship (Fig. 4). The 48.5 mm ratio of the chosen maxillary mold to the mandibular measurement of 35 mm yielded a ratio of 1.38. When this ratio of 1.38 is applied, the desired prosthetic mold is not always available. There is a range of acceptability above and below the desired ratio.(ABSTRACT TRUNCATED AT 250 WORDS)

Cuspid↗