Gingival seal of deep Class II direct and indirect composite restorations.

Purpose: To evaluate in vitro the gingival microleakage of Class II direct and indirect composite restorations with cervical margins 0.5 mm apical to the cemento-enamel junction (CEJ).

Methods: Mesial-occusal (MO) preparations of similar size were made in 10 homologous pairs of caries-free extracted human third molars.

Dimensional accuracy of 7 die materials.

Purpose: The purpose of this study was to compare the linear dimensional accuracy and the handling characteristics of 7 die materials.

Materials And Methods: A master die analogous to a complete veneer crown preparation was machined from medical grade stainless steel, and 3 measurements (1: vertical; 2 and 3: horizontal) were made from 3 scribed reference lines. Individual polyvinylsiloxane impressions were made (n = 10) for each of the specimens.

Use of surgical telescopes by senior dental students: a survey.

This survey examined the use of surgical telescopes (STs) in a large senior dental student class. The percentage of students who purchased STs, factors that influenced those purchases, frequency/patterns of use, and purchase satisfaction were investigated. The survey return rate was 85.

Use of yellow plastic food wrap to retard composite resin polymerization.

Background: Dental chair lights can rapidly polymerize light-reactive composites beyond the point of workability, preventing adequate time for the shaping and sculpting of large direct composite restorations.

Purpose: The purpose of this study was to determine whether yellow plastic food wrap placed over a dental chair light would perceptibly retard the polymerization rate of a light-cured composite (Esthet-X, shade A1, Dentsply/Caulk, Milford, DE, USA).

Materials And Methods: Zero, one, and two thicknesses of yellow plastic food wrap (Reynolds Metals Company, Richmond, VA, USA) were, in turn, used in the following scenarios: (1) placed in a spectrophotometer and compared for percentage transmission of 470 nm light; (2) placed over a curing unit light wand and compared for milliwatts of output on a radiometer; (3) placed over a dental chair light positioned 64 cm from 0.

Retention of posts luted with phosphate monomer-based composite cement in canals obturated using a eugenol sealer.

Purpose: To examine the effect post-obturation sequencing had on retention of endodontic posts luted with a phosphate monomer-based resin cement into canals previously obturated using a eugenol-based sealer.

Materials And Methods: 64 single-rooted teeth were decoronated, and root canals were filed, cleaned, and shaped with a size 5 Gates Glidden drill and 0.12 taper rotary instrumentation.

Effect of prolonged water storage and repeated thermocycling on the reinforcing ability of refrigerated Amalgambond Plus/High Performance Additive in third molars with large mesio-occlusodistal amalgam restorations.

Objective: This in vitro investigation examined what effect prolonged water immersion and repeated thermocycling had on the fracture strength of extracted third molars restored with refrigerated Amalgambond Plus with High Performance Additive (AB+/HPA) and Tytin amalgam.

Materials And Methods: Mesio-occlusodistal (MOD) channels were prepared in one member from each of 19 contralateral pairs. After restoration, specimens were stored in water for 6 months, with thermocycling repeated every 2 months.

Retention strengths of five luting cements on prefabricated dowels after root canal obturation with a zinc oxide/eugenol sealer: 1. Dowel space preparation/cementation at one week after obturation.

Purpose: This investigation examined the effect of 5 different cements on the retention strength of prefabricated endodontic dowels placed into root canals previously obturated with gutta percha and a zinc oxide/eugenol (ZOE) sealer.

Materials And Methods: Ninety-six single-rooted teeth were decoronated, filed, cleaned, sequentially shaped, and divided into 6 groups of 16 specimens each. Five of the groups were then obturated with gutta percha and a ZOE sealer.

Effect of thermocycling on the fracture strength of intact third molars stored for two different time periods.

Objective: This study investigated the effect of thermocycling on the fracture strength of intact, extracted molars stored for two different intervals before testing.

Methods: Thirty-eight recently extracted molars and 38 molars stored for 1 to 5 years were each randomly separated to create four subgroups. One subgroup from each storage interval was thermocycled 1,000 times from 5 to 55 degrees C using 30-second dwell times, and then all teeth were fractured using a universal testing machine.

Effects of a refrigerated amalgam bonding system on fracture resistance.

This in vitro study evaluated the effectiveness of using an amalgam bonding system at refrigerated temperature to regain fracture resistance in molars with large mesial-occlusal-distal restorations. Nineteen pairs of homologous contralateral pairs of third molars were used, with control teeth remaining intact. Although the bonded amalgam group developed 81% of the fracture strength values of the intact teeth, the intact teeth were found to have significantly higher fracture strength values (p = 0.

Simplified clinical procedure for fitting and removing inlays/onlays prior to cementation.

This article describes a procedure in which polytetrafluoroethylene (PTFE) tape is used as a liner for fitting intracoronally retained, indirect restorations. The minimal thickness of the tape allows complete seating and confirmation of marginal fit of restorations during try-in, yet the tape is tough enough to permit trouble-free removal of the restoration afterward. Protection against inadvertent loss of the restoration can be gained if a knot is placed close to the occlusal surface of the restoration prior to its removal.

Effect of dowel space preparation and composite cement thickness on retention of a prefabricated dowel.

Purpose: This investigation examined what effect cement thickness had on retention of prefabricated endodontic dowels luted with a composite resin cement (Panavia 21 OP; J Morita, Irvine, CA) into canals previously obturated with gutta percha and a eugenol-based sealer.

Materials And Methods: Sixty-four single-rooted teeth were decoronated, filed, cleaned, and sequentially shaped with sizes 2-5 Gates Glidden drills (Dentsply/Maillefer, Tulsa, OK) and 0.12 taper rotary instrumentation.

Shear bond strength of bis-acryl composite provisional material repaired with flowable composite.

Background: Time and expense are considerable when refabrication of a bis-acryl composite provisional prosthesis is required, so an effective method of repair is desirable. Attempts at self-repair have been ineffective, and no reports of repair specific to bis-acryl composites were found in the literature.

Purpose: To investigate the strength of a bis-acryl composite repair using flowable composite after two surface treatments and three storage conditions.