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At least 235 records · Page 13Linked to original sources
PubMed2005

A 3-year longitudinal, controlled clinical study of a gallium-based restorative material.

AIM: The aim of this three-year longitudinal controlled study was to compare the clinical performance of Galloy versus a high copper, mercury based Dispersalloy filling material. METHODS: Moderate to large class I and class II cavities or replacement restorations were selected and 25 Galloy restorations and 25 Dispersalloy controls were placed in 14 adult patients by a single operator. Restorations were photographed and a silicone impression recorded at baseline, 6 months, 1 year, 2 years and 3 years. RESULTS: At 3 years all 22 Dispersalloy restorations but only 4 Galloy restorations were still in situ. Three Dispersalloy restorations were lost to follow-up. Tooth fracture was observed in 15 (60%) of the Galloy restorations by the end of the 3 years, compared to one (4%) Dispersalloy restoration, which failed due to tooth fracture. A further six Galloy restorations had to be removed due to complaints of persistent pain. Four teeth restored with Galloy required endodontic treatment but none of the Dispersalloy restored teeth required endodontics. Of the four Galloy restorations remaining in situ, three were relatively small restorations and the fourth a moderate sized restoration required a marginal repair. CONCLUSION: The clinical performance of Galloy restorations was so grossly inferior to the Dispersalloy controls that Galloy cannot be recommended for clinical use in moderate to large or multi-surface cavities.

Adult↗
PubMed1985

Management of a vertically fractured endodontically treated tooth.

The case of a vertically fractured endodontically treated tooth in which an amalgam platform was constructed on the root face is presented. A modified post crown was erected on this base. No exploratory endodontic surgery was performed. Over a 2-year follow-up period, neither the clinical nor the radiographic appearance of the tooth had deteriorated.

Aged↗
PubMed1991

Resistance to torsional forces of various post and core designs.

This in vitro study investigated the resistance of various post and core designs to torsional forces. Cast gold, parallel-sided, serrated post and cores were cemented in extracted teeth. The test groups were made up of the following designs: controls without an antirotational feature, keyway form, coronal flare form, auxiliary pin form, a cervical collar form, and included a tapered post group. The specimens were mounted on an Instron Universal testing machine and a torsional force was applied to the core using a lever arm until failure. All the antirotational features tested elevated resistance to torque. Failure occurred through fracture of the tooth, the cement, or an optional auxiliary pin. The cervical collar was the most favorable design, embracing resistance and reducing tooth fractures.

Dental Cavity Preparation↗
PubMed1992

Prosthodontic claims in the Swedish Patient Insurance Scheme.

The Swedish Patient Insurance Scheme includes a guarantee insurance for prosthetic treatment. Retreatments of failures, up to 2 years after cementation of fixed prosthodontics and 1 year after delivery of removable prosthodontics, are covered by the guarantee insurance scheme. Almost all private practitioners were included in this scheme at the time of the study in 1989. During a specific period all claims were studied at the time of reporting, when annexed radiographs and so forth could be analyzed. One hundred and thirty-six claims were recorded with regard to treatment injury, reasons for remake, latency times from cementation or delivery to diagnosis, and details about the teeth or constructions involved in the claim. The dentist's opinion of the cause of the failure was also recorded. The reports covered treatment injuries, most of them root perforations during preparation for a post. The guarantee claims for single crowns concerned porcelain fractures, loss of retention, and root fractures as the most frequent failures. For fixed partial dentures the failures were recorded as loss of retention, porcelain fractures, tooth or root fractures, and metal framework fractures in that order. The dentist gave information about his/her opinion of the reason for the failure in only 38.5% of the claims. There were, however, no clear findings about the reasons for the failures.

Crowns↗
PubMed2001

Incidence of oral tissue trauma after the administration of general anesthesia.

BACKGROUND: Administration of general anesthesia necessitates certain amounts of manipulation or instrumentation within the mouth that may cause some oral tissue injuries. The purpose of this study was to determine the incidence of oral tissue trauma after receiving general anesthesia. Some possible risk factors were explored. METHODS: Four hundred and four adult patients receiving surgical procedures under general anesthesia facilitated by endotracheal intubation were included in this prospective survey. In each patient detailed oral and dental conditions were evaluated and recorded by an oral surgeon before and after operation. The extent of oral tissue trauma were computed and the type and character of the injury were recorded. RESULTS: Twenty-eight patients (6.9%) were found to sustain various degrees of oral trauma that included soft tissue laceration, tooth fracture, prosthesis damage, tooth avulsion, ecchymosis and numbness of tongue. Preexistence of missing tooth, crown, and residual root were some possible risk factors that might predispose to complication. CONCLUSIONS: Oral tissue trauma as it seems to be a common anesthetic complication that should be considered as a recognized hazard of general anesthesia. Understanding and recognizing oral anatomical condition and pathological change before anesthesia may help the anesthesiologists in preventing oral and dental complications and thus to avoid legal suits.

Adolescent↗
PubMedDate not supplied

Computer-aided direct ceramic restorations: a 10-year prospective clinical study of Cerec CAD/CAM inlays and onlays.

PURPOSE: The objective of this follow-up study was to examine the performance of Cerec inlays and onlays in terms of clinical quality over a functional period of 10 years. MATERIALS AND METHODS: Of 200 Cerec inlays and onlays placed in a private practice between 1989 and early 1991, 187 restorations were observed over a period of 10 years. The restorations were fabricated chairside using the Cerec-1 computer-aided design/manufacturing (CAD/CAM) method and Vita MK I feldspathic ceramic. An adhesive technique and luting composite resin were used for seating the restorations. After 10 years, the clinical performance of the restorations was evaluated using modified USPHS criteria. The results were used to classify success and failure. RESULTS: According to Kaplan-Meier analysis, the success rate of Cerec inlays and onlays dropped to 90.4% after 10 years. A total of 15 (8%) failures were found in 11 patients. Of these failures, 73% were caused by either ceramic fractures (53%) or tooth fractures (20%). The reasons for the remaining failures were caries (20%) and endodontic problems (7%). The three-surface Cerec reconstructions were found to have the most failures. CONCLUSION: The failure rate of 8% and the drop of the survival probability rate to 90.4% after 10 years of clinical service of Cerec-1 CAD/CAM restorations made of Vita MK I feldspathic ceramic appear to be acceptable in private practice. This is particularly true in light of the very high patient satisfaction.

Adolescent↗
PubMed2004

Durability of extensive Class II open-sandwich restorations with a resin-modified glass ionomer cement after 6 years.

PURPOSE: To evaluate the durability of a modified open-sandwich restoration utilizing a resin-modified glass ionomer cement (RMGIC) in large cavities. METHODS: 268, mostly extensive, Class II Vitremer/Z100 restorations were placed in 151 patients. 47% of the restorations were placed in patients considered as caries-risk patients. Six experimental groups, differing from each other in thickness of RMGIC layer and preconditioning, were evaluated at baseline and annually during 6-7 years according to modified USPHS criteria. RESULTS: After 6 years, 220 restorations were evaluated. 42 failures (19%) were observed. The most frequent reasons for failure were material fracture (n = 11), tooth fractures (n = 9) and secondary caries (n = 10). Non-acceptable proximal dissolution of the RMGIC was seen in six restorations. Significantly more failures, but similar dissolution of the RMGIC, were recorded in high caries risk patients. No differences were seen between the experimental groups or between restorations with thick or thin RMGIC layer. 160 restorations were also evaluated at 7 years. Another 13 failures were observed, eight with non-acceptable dissolution, three secondary caries and two fractures. It can be concluded that the modified open sandwich restoration showed an acceptable durability for the extensive restorations evaluated. An accelerating dissolution of the RMGIC was observed at the end of the study.

Acid Etching, Dental↗
PubMedDate not supplied

Parameters of MOD cavity preparations: a 3-D FEM study, Part II.

Stresses induced by the influence of variations in the dimensions of three different parameters of MOD cavity preparations were studied using the finite element technique. The parameters studied were the depth, isthmus width, and the thickness of the remaining interaxial dentin. A total of eight different cavity designs, divided into three groups, were compared with the normal (unprepared) tooth and other cavity designs in the same group. Enamel and dentin experienced large regional variations in compressive stresses even in normal teeth. Teeth with prepared cavities showed even more variation, and stress combinations became critical from a tooth fracture point of view. It was seen that narrow but deep cavity preparations and wide and equally deep cavity preparations experienced a similar, damaging combination of stresses. It was deduced from the stress patterns observed in this study that the depth of the cavity preparations is the most critical factor in fracture of the tooth or cusps, whereas the width of the isthmus alone is the least critical.

Dental Cavity Preparation↗
PubMed1998

The use of an orthodontic thermoplastic retainer as a provisional anterior restoration: a case report.

Children who present with extensive fractures of anterior teeth pose a difficult clinical problem. Pulpal and periodontal injuries must be carefully assessed and managed. Rapid restoration of the form and contour of the extensively fractured tooth is advisable, not only to improve esthetics but also to prevent unwanted tipping or tilting of adjacent teeth and overeruption of opposing teeth. A modified Essix retainer, simply constructed in the laboratory, can be used to provisionally restore the extensively fractured anterior tooth.

Child↗
PubMed2005

Evaluation of resin composite materials. Part II: in vivo investigations.

PURPOSE: To clinically evaluate two different resin-based composites (Solitaire I and Ariston pHc) in order to determine the minimum clinical evaluation time needed to detect critical signs of failure. METHODS: In a controlled prospective clinical study, 99 cavities (30 Class I, 69 Class II) in 31 patients were restored (50 Ariston pHc without enamel etching and rubber dam, 49 Solitaire I restorations with total etching and rubber dam) and clinically investigated at baseline, after 6, 12, and 24 months. RESULTS: After 2 years of clinical service, 49 restorations (Ariston pHc: n = 38, Solitaire: n = 11) had to be replaced. The majority of failures occurred after more than 1.5 years. The reasons for replacement were differently distributed in both groups (Ariston pHc: 28 tooth fractures, 3 gap formations, 5 hypersensitivities, 1 bulk fracture, 1 marginal fracture. Solitaire: 5 gap formations, 1 hypersensitivity, 3 bulk fractures, 1 wear of the restorative material, 1 void in the restoration). Forty-four restorations were still in function after 2 years (overall failure rate after 2 years: 14%; Ariston pHc: 17%; Solitaire: 7%; survival analysis algorithm according to Kaplan/Meier). Comparing the materials, no statistical differences were evident except for the criteria "integrity tooth" (= tooth fracture or cracks) and "hypersensitivity" (from the 12-month recall; Mann-Whitney U-test; P< 0.05). In both cases of significant difference, Ariston pHc exhibited inferior results. After 2 years, only three teeth restored with Ariston pHc did not show considerably cracked enamel. The additional marginal analysis showed statistically significant differences for both materials regarding the criteria "perfect margin" (decrease), "gap formation" (increase), and "negative step formation" (increase; P< 0.05; Friedman 2-way ANOVA) between the four recalls. Therefore, a 2-year in vivo evaluation should be recommended prior to marketing a dental restorative material.

Acid Etching, Dental↗