Survival rates and reasons for failure of posterior composite restorations in multicentre clinical trial

Clinical Evaluation of Resin-based Composites in Posterior Restorations: Two-year Results

“…Many studies [28][29] have indicated that up to 30% of the study populations have reported postoperative sensitivity following placement of a posterior resin restoration. Self-etch primers make the smear layer part of the hybrid layer, as it dissolves the smear layer, incorporating it into the mixture of collagen fibers and resin monomers.…”

Striations Resulting from Fatigue Crack Growth in Dentin

“…For old dentin (θ=90 o ) the values of Ra and Rz were smaller than those for young dentin. The power spectrum density (PSD) was generated from the surface profiles using commercial software 5 . Figure 5(a) shows the power spectrum for the fracture surface of a CT specimen from a young (male 17 years age) patient.…”

“…While it is plausible that fracture in the restored tooth results from a single catastrophic load, it is generally believed that such failures are the result of subcritical cracking induced by repetitive stresses, i.e., fatigue [3]. Damage induced by restorative processes can grow with time due to cyclic stresses resulting from mastication and can enable complete fracture of the tooth [4][5][6][7].…”

“…While it is plausible that fracture in the restored tooth results from a single catastrophic load, it is generally believed that such failures are the result of subcritical cracking induced by repetitive stresses, i.e., fatigue [3]. Damage induced by restorative processes can grow with time due to cyclic stresses resulting from mastication and can enable complete fracture of the tooth [4][5][6][7].A number of in vitro studies on cyclic crack growth in bovine [8][9][10], elephant [11,12] and human dentin [13][14][15] have been conducted in the recent past. These studies have been successful in quantifying the fatigue properties of dentin.…”

A Review on Marginal Deterioration of Composite Restoration

“…The clinical evaluation of marginal deterioration can be done using modified USPHS criteria which includes evaluation of marginal adaptation, marginal discolouration, secondary caries. The loss of marginal adaptation and the presence of secondary caries are predictors of the failure of composite resin restorations and being the main reason for the replacement of restorations [5] Marginal fit is assumed to affect the restoration longevity by either encouraging or discouraging microleakage and development of secondary or marginal caries. [6] II.…”