Abstract
ObjectivesTo evaluate long-term survival and success rates of conventionally cemented partial-coverage crowns (PCCs) manufactured from high noble metal alloys (hn).Material and methodsRestoration-, periodontal- and tooth-related criteria on patients, restored with a single or multiple conventionally cemented hnPCCs in a private dental office were collected from existing patient records. With regard to semi-annual follow-ups, data of the most recent clinical evaluations were considered. Kaplan–Meier and log-rank tests were used for statistical analyses. Level of significance was set at p ≤ .05.ResultsBetween 09/1983 and 09/2009, 1325 hnPCCs were conventionally cemented on 1325 teeth in 266 patients (mean age: 44.5 ± 10.7 years). Due to various reasons, 81 hnPCCs showed complications, documenting a success rate of 93.9% after a mean observation period of 18.8 ± 5.7 years. Of these, additional 14 restorations were counted as survival, resulting in a survival rate of 94.9%. Most frequent complications were periodontal issues (n = 29, 35.8%). Significantly higher success rates were documented for hnPCCs of patients aged between 37 and 51 years (p = .012).ConclusionPartial-coverage crowns from high noble metal alloys showed excellent survival and success rates after a mean observation period of 18.8 ± 5.7 years. Higher patient age was one of the risk factors.Clinical RelevanceAccording to the results of this study, hnPCCs still represent an excellent therapeutic option—even in modern dentistry.
Highlights
Dental structure can be damaged by various reasons and requires different conditional treatments to ensure the preservation of the remaining tooth substance
The working hypothesis is that hnPCCs continue their eligibility as an option for restorations of decayed teeth in dentistry with good long-term prognosis
All hnPCCs were conventionally cemented on teeth of 266 patients with a mean age of 44.5 ± 10.7 years at loading
Summary
Dental structure can be damaged by various reasons and requires different conditional treatments to ensure the preservation of the remaining tooth substance. Defects can be restored in a direct and indirect approach. Limitations for both procedures exist, but a recommendation of when to use direct and indirect restorations is not clearly described in the literature [1]. For large defects with cusp involvement or complicated residual occlusal surfaces, mainly indirect techniques are used. Indirect restorations have various advantages especially when used for defects that affect the stability of teeth and contain one or more cusps. Thereby, partial-coverage crowns (PCCs) are restorations for lost tooth structure, requiring a minimally invasive and technically challenging procedure,
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