Clinical outcomes and influence of material parameters on the behavior and survival rate of thin and ultrathin occlusal veneers: A systematic review

Abstract

Tooth wear is a widespread multifactorial and complex problem in the population, that leads to localized or generalized tooth substance loss. Erosion, abrasion, abfraction, and attrition could be related to mechanical, chemical, and physiological factors or a combination of two or more factors [1,2]. Occlusal tooth wear (attrition) is a prolonged physiological degradation or a very aggressive pathological lesion requiring consultation, monitoring, or intervention in severe cases [3]. Occlusal wear is not always related to temporoman-dibular disorders (TMD)[4], as the process could be symptomless for a long time. The correlation of habits, namely clenching, awake-and sleep bruxism to TMD is controversial [5,6]. Meanwhile, anxiety, depression, and stress might increase parafunctional habits and tooth wear, which are related to increased muscle tone [7].Based on the European consensus on tooth wear treatment, the most important question that needs to be addressed is whether the wear is pathological or physiological and whether it is severe or mild. As for restorative intervention, it is better to delay it as possible, and if necessary, a conservative, minimally invasive approach is recommended [8]. Composite resin overlays were one of the first approaches used. Despite requiring periodic maintenance, they are still considered viable treatment options. However, in some cases, traditional treatment interventions are required [9].

Minimally invasive CAD/CAM lithium disilicate partial‐coverage restorations show superior in‐vitro fatigue performance than single crowns

“…Specimens, which were unscathed after fatigue were rated as success and samples with evident cracks or debonding, but still in function (in situ) were rated as survival. Samples with catastrophic bulk fractures (fractures where the entire ceramic restoration was fractured and split into two or more pieces) were rated as non‐survival 15,62,63 …”

“…Samples with catastrophic bulk fractures (fractures where the entire ceramic restoration was fractured and split into two or more pieces) were rated as non-survival. 15,62,63 2.5 | Single-load-to-failure testing After fatigue, all specimens were subjected to a single cycle loadto-failure test (SLF) in a universal testing machine (Zwick Z010/TN2S, Zwick Roell, Ulm, Germany) (Figure 5). Load was applied through a steel ball with a diameter of 6 mm, which was aligned at the same contact point as during thermomechanical fatigue.…”

“…The limited evidence of in‐vitro studies, which are available on monolithic LDS (IPS e.max CAD and IPS e.max Press) crowns with a reduced layer thickness of 0.5 mm reported a high variability of failure loads (values between 369.2 ± 117.8 and 827 ± 318 N 34,46,47 ). In contrast, minimally invasive LDS occlusal veneers (IPS e.max Press and IPS e.max CAD) showed extraordinary results in a systematic review on in‐vitro and clinical studies 15,48–50 . Nevertheless, clear recommendations for a minimally invasive preparation design for cases in which defects involve occlusal as well as buccal or cervical areas are currently missing.…”

Effect of preparation design on marginal adaptation and fracture strength of ceramic occlusal veneers: A systematic review

“…Nowadays, preparation designs for all-ceramic restorations are modifications of conventional cast metal restorations (Stappert et al, 2008). Ultrathin one-step with no-prep polymer infiltrated ceramic network (PICN) overlays have indicated very high longevity and success (Ahmed et al, 2022).…”

“…Nowadays, preparation designs for all‐ceramic restorations are modifications of conventional cast metal restorations (Stappert et al, 2008 ). Ultrathin one‐step with no‐prep polymer infiltrated ceramic network (PICN) overlays have indicated very high longevity and success (Ahmed et al, 2022 ). According to available data, the effects of preparation designs for an overlay are limited (Falahchai, Babaee Hemmati, Neshandar Asli, & Rezaei, 2020 ).…”