Influence of cavity dimensions and their derivatives (volume and ‘C’ factor) on shrinkage stress development and microleakage of composite restorations

Braga, Roberto Ruggiero; Boaro, Letícia Cristina Cidreira; Kuroe, Toshifumi; Azevedo, Caio Lucidius Naberezny; Singer, Júlio M.

doi:10.1016/j.dental.2005.11.010

Cited by 133 publications

(116 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No debljina cementnog sloja može utjecati na dugovječnost nadogradnje. Pretjerano debeo sloj cementa upućuje na lošu prilagodbu nadogradnje, što može pogodovati odvajanju cementa (11,32) i povećava kontrakciju polimera (33).…”

Section: Discussionunclassified

See 1 more Smart Citation

Intracanal Adaptation of a Fiber Reinforced Post System as Compared to a Cast Post-and-Core

Muttlib¹,

Azman²,

Seng³

et al. 2016

Acta Stomatol Croat

View full text Add to dashboard Cite

Ključne riječi liječenje korijenskog kanala; rubno prijanjanje materijala za punjenje; tehnika kolčića i nadogradnje; vlaknima ojačani polimeri www.ascro.hr Prilagodba dvaju različitih sustava intrakanalnih kolčića Muttlib i sur. 330within the root canal, making the tooth more susceptible to fracture (10,11). This increases the stress within the root and increases the chances of failure. A poorly adapted post will create a marginal gap in which the presence of insufficient cementation can lead to microleakage (12). The prolonged leakage will cause the separation of the post from the root canal and eventually lead to common failures of the post-core systems. Oral fluids, bacterial toxins and all kinds of ions that penetrate through the interfacial space between the restoration and the tooth may lead to marginal discoloration (13), secondary caries and marginal fracture (14)(15)(16).A post's passive retention is improved when it adapts properly into the prepared post space and if the luting agent is thin and even (17,18). A thin layer of cement instead of the different amount of luting agents surrounding the customized post helps to limit stress concentration in the root canal. A study by Kremeier et al. (18) demonstrated that thicker layers of luting agent increase the risk of shrinkage strain, resulting in reduced bond strength by creating more stress during polymerization. Thicker cement found between the post and the canal could lead to displacement of the post (11,19). The cement-dentine interface is the site at which decementation generally occurs due to the bubbles and pores that form due to curing stress (20,21). Therefore, a well-adapted post that fits the root canal shape can reduce the risk of debonding which is subsequently leading to failure of the post (19).When a post does not adapt well, a gap or space will be created in the canal which will become a harboring place for bacterial infection. Despite having a good apical seal from the remaining gutta-percha, bacteria from the coronal portion can spread through it. It may take only a few days for bacteria to pass the apical 3-5mm of apical root canal filling (22). Little is known about the intra-canal adaptation of the fiber reinforced composite (FRC) post systems. Therefore, the aim of this study was to investigate the adaptation of cast post-and-core (CPC) and FRC post system inside the root canal. In addition, the CPC's adaptation quality will be compared with the FRC's adaptation quality. Materials and methodsThis was an experimental study based on in-vitro procedures. It was performed in the Craniofacial Laboratory of School of Dental Sciences, Health Campus, Universiti Sains Malaysia.PS software (Dupont and Plummer, 1997) was used to calculate the sample size with standard deviation (σ) which is assumed to be 7.4 (23) of the mean gamma count with 80% power and alpha 0.05. Fifteen samples were needed for this study. Having anticipated possible problems with 10% of samples during the procedure, total samples of 17 were prepared for this study.Sev...

show abstract

Section: Discussionunclassified

“…However, the thickness of cement filling in the spaces can affect the longevity of the post system. Excessively thick cement represents a poor adaptation of the post, which may cause debonding (11,32) and increases shrinkage of the polymer that is related to the volume of restoration (33).…”

Section: Discussionmentioning

confidence: 99%

Intracanal Adaptation of a Fiber Reinforced Post System as Compared to a Cast Post-and-Core

Muttlib¹,

Azman²,

Seng³

et al. 2016

Acta Stomatol Croat

View full text Add to dashboard Cite

show abstract

“…Depending on the degree of destruction of intraradicular dentin, several restoring techniques have been proposed, aiming to reduce the resin cement thickness and, consequently, the polymerization stress at the cement/dentin and cement/post interfaces (21).…”

Section: Discussionmentioning

confidence: 99%

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

et al. 2016

View full text Add to dashboard Cite

This study evaluated the fracture strength of endodontically treated teeth submitted to reconstructive techniques through dynamic and static tests. Forty human anterior teeth were divided into 4 groups (n=10): GNW (non-weakened) -root restored with glass fiber post (GFP), GW -weakened root restored with GFP, GDA -weakened root restored with direct anatomic GFP, and GIA -weakened root restored with indirect anatomic GFP. The teeth were endodontically treated considering that experimental groups (GW, GDA and GIA) simulated weakened roots for restoration with GFP using different techniques. The GFP was luted with resin cement and the coronal portion was restored with composite resin and metallic crowns. All samples were submitted to chewing simulation at 60 cycles/ min in a total of 300,000 cycles. The survival samples were further exposed to compressive loading at a crosshead speed of 1.0 mm/min in a universal testing machine. The load was applied at 135° to the long axis of the tooth until failure. Data were analyzed by ANOVA (α=0.05). After chewing simulation were observed: GNW: 100% of survival roots; GW: 70% of survival roots, and GDA and GIA: 80% of survival roots. The mean fracture strength values (N) were 280.6 (GNW), 239.0 (GW), 221.3 (GDA), and 234.1 (GIA) without significant difference among the groups (p=0.7476). The results suggested similar fracture strength in both weakened and non-weakened teeth regardless the reconstructive technique of root internal wall. Higher incidence of catastrophic fracture was observed in weakened teeth without restoration of the root internal wall.

show abstract

“…22 High gap formation values were commonly observed at the internal angles in all groups tested, and this could be related to high shrinkage stress in these areas. 29 As shown in Figure 6, in the cavosurface region, restoration sealing was improved by the proximity of free surfaces that allowed stress relief by resin composite flow. 22,29 This explains why gap measurement was analyzed only on the cavity floor.…”

mentioning

confidence: 94%

“…29 As shown in Figure 6, in the cavosurface region, restoration sealing was improved by the proximity of free surfaces that allowed stress relief by resin composite flow. 22,29 This explains why gap measurement was analyzed only on the cavity floor. In microleakage studies, cavity depth was found to have a stronger influence than diameter.…”

mentioning

confidence: 94%

Influence of C-factor and Light-curing Mode on Gap Formation in Resin Composite Restorations

Santos¹,

Santos²,

Sampaio³

et al. 2009

Operative Dentistry

View full text Add to dashboard Cite

show abstract

Influence of cavity dimensions and their derivatives (volume and ‘C’ factor) on shrinkage stress development and microleakage of composite restorations

Cited by 133 publications

References 19 publications

Intracanal Adaptation of a Fiber Reinforced Post System as Compared to a Cast Post-and-Core

Intracanal Adaptation of a Fiber Reinforced Post System as Compared to a Cast Post-and-Core

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

Influence of C-factor and Light-curing Mode on Gap Formation in Resin Composite Restorations

Contact Info

Product

Resources

About