ABSTRACT
This study conducted a longitudinal prospective clinical study of the single-crystal sapphire (Al2O3) cylindrical screw-shaped endosteal dental implant, and attempted to establish clinical parameters to evaluate implant success or failure. Twenty-eight mandibular implants (17 patients) were placed. After six weeks' healing, 23 implants in 15 patients served as distal abutments for fixed prostheses (baseline). Implants were evaluated for bleeding index, crevicular fluid volume index, plaque accumulation index, radiographic index, mobility index, and patient comfort. Any implant failing in three of these criteria or implants removed were judged as failures. After 10 years, of the 21 baseline implants recalled (two implants were lost to recall), 17 were fully functional, for an 81% success rate. The use of qualitative and quantitative clinical evaluation parameters as utilized in this study appears to be important and useful in assessments of the clinical serviceability of dental implants. These parameters can be used in human clinical trials as well as in experimental animal studies.
Subject(s)
Aluminum Oxide , Dental Implantation, Endosseous , Dental Implants , Analysis of Variance , Ceramics , Clinical Trials as Topic/standards , Dental Plaque Index , Dental Prosthesis Design , Dental Prosthesis Retention , Denture, Partial, Fixed , Gingival Crevicular Fluid/metabolism , Humans , Longitudinal Studies , Periodontal Index , Prospective Studies , Prosthesis Failure , Treatment OutcomeABSTRACT
The overall objective of this clinical study was to determine the feasibility of using a sealed composite restoration to arrest caries. This objective was to be achieved using minimal tooth preparation for Class I lesions, without the traditional Class I cavity preparation and without the removal of the carious lesion. The minimal tooth preparation consisted of no [corrected] removal of the carious lesion, bevel in enamel only, and usually not requiring any anesthetic injection. These ultra-conservative sealed composite restorations placed over caries (CompS/C) were compared with ultra-conservative sealed amalgam restorations (AGS) and with the traditional (unsealed) amalgam restorations (AGU). This study showed that: 1) caries is arrested under the CompS/C restoration for a period of 4 years; 2) sealant retention is similar in both the CompS/C and the AGS groups; 3) the marginal integrity of the AGS restorations is markedly superior to that of the AGU restorations; and 4) sealant appears to prevent wear of posterior composite restorations.
Subject(s)
Dental Caries/prevention & control , Dental Restoration, Permanent , Pit and Fissure Sealants , Adolescent , Adult , Aged , Child , Composite Resins , Dental Amalgam , Female , Humans , Male , Middle AgedABSTRACT
The overall objective of this clinical study was to determine the feasibility of using a sealed composite restoration to arrest caries without the removal of the carious lesion and without the traditional cavity preparation. The minimal tooth preparation (a bevel in enamel) usually did not require any anesthetic injection and conserved tooth structure. These ultraconservative sealed composite restorations placed over caries (CompS/C) have been compared with ultraconservative sealed amalgam restorations (AGS) and with the traditional outline form (unsealed) amalgam restorations (AGU). This clinical study has shown that: (1) caries can be arrested by the CompS/C restoration for a period of three years; (2) the marginal integrity of the AGS restorations showed a definite trend toward improvement as compared to the AGU restorations; and (3) complete sealant retention over posterior restorations was similar in both the CompS/C and the AGS groups during the first two years; however, at Year 3 complete sealant retention was 16 percent higher in the CompS/C than in the AGS group.
Subject(s)
Composite Resins , Dental Amalgam , Dental Caries/prevention & control , Dental Restoration, Permanent/methods , Adolescent , Adult , Child , Color , Composite Resins/chemistry , Dental Amalgam/chemistry , Dental Bonding , Dental Caries/diagnostic imaging , Dental Caries/pathology , Dental Cavity Preparation/methods , Dental Enamel/diagnostic imaging , Dental Enamel/pathology , Dentin/diagnostic imaging , Dentin/pathology , Female , Follow-Up Studies , Humans , Male , Middle Aged , Radiography , Surface Properties , Time FactorsSubject(s)
Aluminum Oxide , Aluminum , Dental Implantation, Endosseous , Ceramics , Clinical Trials as Topic , Dental Abutments , Dental Plaque Index , Denture Design , Denture, Partial, Fixed , Gingival Crevicular Fluid , Gingival Hemorrhage/diagnosis , Humans , Longitudinal Studies , Periodontal Index , Prospective Studies , Surface PropertiesABSTRACT
The 2-year clinical evaluations of paired occlusal restorations are presented. Each study participant received a sealed composite restoration placed over a carious lesion and either a traditional outline-form (unsealed) amalgam or an ultraconservative sealed amalgam restoration. Caries was removed before placement of both types of amalgam restorations. No important clinical differences developed among the three groups of restorations.
