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At least 739 records · Page 41Linked to original sources
PubMed1999

An investigation of the variables which may affect the bond between plastic teeth and denture base resin.

OBJECTIVES: The failure of the bond between acrylic resin denture base material and resin teeth remains a significant problem. This study evaluated the tensile bond strength of specimens produced by commonly employed tooth preparation and processing methods as used in dental laboratories. METHODS: Twenty-two experimental groups, each consisting of 36 specimens, were investigated by subjecting the tooth-resin bond to tensile loading. The groups were allocated to one of five experimental sets to investigate: (a) effect of resin dough time, (b) effect of tooth surface condition, (c) effect of processing variables, (d) effect of monomer cementing, and (e) effect of acrylic resin cement. The results were analysed statistically using a one factor ANOVA and a Student t test. RESULTS: A significantly stronger bond was obtained when the resin was packed late in the dough stage, and a superior bond, in all cases, when high-impact resin was used. Tooth surface modification by grinding or grooving made no significant difference when compared with unmodified surfaces. Wax-contaminated surfaces produced highly significant weaker bonds. Time of introduction and duration of water-bath processing had no significant effect on bond strength. Monomer cementing of the tooth surface, especially with high-impact monomer. significantly improved the bond strength. The application of resin cements was found to produce the most significant increase in denture tooth bond strength. CONCLUSIONS: The important steps in obtaining a consistently high value denture tooth bond are thorough dewaxing of the tooth surface followed by the application of a suitable resin cement.

Acrylic Resins↗
PubMed1993

Anterior tooth replacement with implants in patients with a narrow alveolar ridge form. A clinical study using guided tissue regeneration.

Clinical and radiographic examination was used to select patients with a suspected need of guided tissue regeneration (GTR). Fifteen patients with 20 fixtures were included in the study. Nine (45%) of the fixtures were completely covered with bone at fixture surgery and no GTR was required in these cases. On the remaining 11 fixtures, one or more sites were exposed and thus an expanded polytetrafluoroethylene membrane was used. The regenerative results were assessed using 2 methods, a) calculation of exposed threads in the mouth and on projected colour slides, b) photometric evaluation of exposed area. In total, the membrane group showed a bone gain of 81% when threads were calculated. Almost complete agreement in percentage of bone gain was observed between buccal (80.7%) and lingual (82.6%) sites. Photometric evaluation for the buccal sites showed a bone gain of 74%. Complete bone regeneration (100%) was achieved when healing was free from complications and also under an exposed membrane when infection was absent. The results indicate that the membrane technique is highly successful for treatment of exposed implants when healing is free from complications. It also shows that clinical and radiographic examination is not precise enough to differentiate between those patients planned for routine fixture surgery and those with a supplementary need for GTR. Thus access to GTR technique is important when treatment is planned for borderline cases.

Adolescent↗
PubMed1994

Effects of early placement of a single tooth implant. A case report.

A single tooth implant was placed in a boy aged 12 years and 3 months. The case has been followed for more than 4.5 years. The fixture did not move together with the adjacent teeth as the maxillary growth went on. There was no "loss" of marginal bone on the side of one adjacent tooth where the distance between implant and tooth was appropriate. But a "loss" of marginal bone (measured from the cemento-enamel junction) was noted on the other adjacent tooth where the fixture had been placed too close to the tooth.

Age Factors↗
PubMed1995

A study of 184 consecutive patients referred for single-tooth replacement.

The aim of this investigation was to study the acceptance and the rejection of patients referred for single implant restorations based on data from referral, case history, clinical examination and therapy planning. The referrals comprised 184 patients with 251 missing single teeth. Sixty-four per cent of the referred patients were accepted for treatment. There was a difference in acceptance between men and women (75% and 54%, respectively). A negative relationship was noticed between age and acceptance. External trauma (33%), root fractures (16%) and congenitally missing teeth (15%) were the main reasons for lost or missing teeth. Anatomical limitations was the most frequent reason for rejection (76%). Most fillings and crowns on adjacent teeth to the edentulous space did not serve as a contraindication for an implant single-tooth restoration, and thus extensive fillings or not acceptable crowns was the cause of rejection only for a minor group (13%). The great majority of the partially dentate patients showed a very high interest in treatment with single-tooth implants, but some of the patients (4% in all, 11% of those rejected for treatment) did not want implant treatment after having received further information at the specialist clinic.

Adolescent↗
PubMed1995

Single-tooth replacement by osseointegrated Brånemark implants. A retrospective study of 82 implants.

The aim of the study was to evaluate the outcome of single-tooth restorations on Brånemark implants performed during the period 1984-1989. The material comprised 58 consecutive patients with 82 implants. The observation period varied from 1 to 5 years. Two implants were lost, both of them before loading. The overall survival rate was 97.6%. Radiographic follow-up was performed for 72 implants after 1 year and for 51 implants after 2 years. The bone loss during the first year was on average 9.6 +/- 0.1 mm and during the second year 0.1 +/- 0.1 mm. Although the observation time for most of the patients was only 2 years, the results indicate that the outcome of single-tooth restorations may be as favorable as for implants in edentulous jaws.

Adult↗
PubMed1999

Comparison between a short and a conventional blade periodontal curet: an in vitro study.

This in vitro study was done to compare a short-blade, long-shank (test) curet designed for deeper pockets of incisors and a conventional Gracey 1/2 curet regarding (a) their ability to remove root surface material at different pocket depths, and (b) their effect on root surface roughness. 2 groups of 12 senior dental hygiene students used either the randomly assigned test or conventional curet for a defined period on maxillary and mandibular incisors in a cross-over experimental design. Extent of root debridement was determined by assessing the removal of black enamel paint on root surfaces within pockets using a computerized video routine and root surface roughness measured using a profilometer. When each surface of the root was analyzed separately at 2-mm increments, the test instrument exhibited superior material removal on all surfaces at the 4-6 mm CAL (p-values<0.001). However, the test curet caused a rougher surface than the conventional curet on all surfaces (p<0.001), with a mean difference of 0.27 microm. While it is assumed that the ability of the test instrument to debride the root surface of deeper pockets more thoroughly is clinically more important than the rougher root surfaces it produces, this can only be assessed by further studies in vivo.

Analysis of Variance↗
PubMed2001

Good occlusal practice in removable prosthodontics.

The loss of teeth may result in patients experiencing problems of a functional, aesthetic and psychological nature. This section addresses the very important subject of occlusal considerations for partial and complete dentures. The occlusion is particularly important given the bearing that occlusal factors have, especially on edentulous patients.

Alveolar Process↗