Microstructural Evaluation of the Mineralized Apical Barrier Induced by a Calcium Hydroxide Paste Containing Iodoform: A Case Report.

Introduction: A 65-year-old man had nonsurgical retreatment using an iodoform and calcium hydroxide paste in a maxillary left canine with persistent apical periodontitis. An apical mineralized barrier (AMB) was observed 3-months postoperatively. Unfortunately, the tooth was extracted due to a cementum tear.

Responses of MC3T3-E1 cells to three dental resin-based restorative materials.

This study aimed to examine the influences of three dental resin-based restorative materials on cells associated with hard tissue regeneration using osteoblastic MC3T3-E1 cells. A Bis-GMA-based resin composite [Clearfil AP-X (APX)], an MMA-based resin cement [Superbond C&B (SB)], and a resin-modified glass-ionomer [Fuji Ionomer Type II LC (LC)] were tested. A zinc oxide eugenol cement [Super EBA (EBA)] was included in the study for comparison.

The relationship between the color of carious dentin stained with a caries detector dye and bacterial infection.

This in vitro study aimed to design a method for the objective evaluation of carious dentin using numerical values. This study also investigated the relationship between the color of carious dentin stained with a caries detector dye using this objective method and the rate of bacterial detection as detected by a polymerase chain reaction (PCR). In 15 molars with occlusal dentin caries and three extracted sound molars, dentin was removed in multiple steps with 300 microm removed each step.

Comparison of osteoblast responses to hydroxyapatite and hydroxyapatite/soluble calcium phosphate composites.

Hydroxyapatite/soluble calcium phosphate composites (HAp/SCaP) are novel HAp-based materials with enhanced solubility that have been developed by annealing HAp in a vacuum. This study compared the effects of HAp and HAp/SCaP on osteoblast proliferation, differentiation, and mineralization using an MC3T3-E1 cell culture system. MC3T3-E1 cells were cultured on HAp or HAp/SCaP, and the number of attached cells and their morphology were examined.

Optimal positioning for a dental operating microscope during nonsurgical endodontics.

The most comfortable positioning for a dental operating microscope (DOM) during nonsurgical endodontics for operators was investigated. Operators were categorized into 3 groups according to height. We recorded the time taken to obtain magnified images, and the angles of binoculars, microscope body, and the mirror to floor surfaces.

A two-year comparison of resin-based composite tunnel and Class II restorations in a randomized controlled trial.

Purpose: To evaluate the performance of total tunnel restoration with resin-based composites compared to Class II resin-based composite restorations in a randomized controlled clinical study.

Methods: 63 approximal carious lesions were restored in 38 patients by two experienced operators. The carious dentin and approximal demineralized enamel were completely removed for the tunnel restoration leaving the marginal ridge intact.

Prognosis of intentional replantation of vertically fractured roots reconstructed with dentin-bonded resin.

There is no particular treatment established to preserve vertically fractured teeth. We evaluated the long-term prognosis of the intentional replantation of 26 vertically fractured roots after reconstruction with 4-META/MMA-TBB dentin-bonded resin. Replanted teeth were evaluated according to clinical criteria and radiographic examinations for periods ranging from 4 to 76 months.

Polymerization contraction stresses of resin-based composite restorations within beveled cavity preparations of Class I restorations.

Purpose: To evaluate internal stresses resulting from polymerization of resin-based composite materials in cavity preparations beveled at the internal line angles or the cavosurface margin, compared with those in conventional butt-joint box-shaped cavity preparations.

Materials And Methods: Contraction stress generated in resin-based composite restorations placed in an experimental cavity preparation model was determined using micro-photoelastic analysis. Three types of cavity preparations simulating Class I restorations with bevels at internal line angles (1 mm and 2 mm deep), and at the cavosurface margin (2 mm deep) were prepared in a posterior composite model in order to obtain no marginal defect with the restorative composite.

Cytotoxicity of dentin conditioners and primers on human periodontal ligament cells in vitro.

Purpose: To examine the cytotoxicity of dentin conditioners and primers on human periodontal ligament (PDL) cells in vitro.

Materials And Methods: Primary PDL cells were plated in 96 well culture plates and exposed to 100 microL of test solutions. Undiluted Cavity Conditioner (CC), Vitremer Primer (VP), Uni-Etch (UE), All-Bond 2 (AB), Gluma conditioner (GC), and Gluma primer (GP) were examined at full strength and at 1/100 and 1/1000 dilutions in culture medium.

Antibacterial activity and bonding characteristics of an adhesive resin containing antibacterial monomer MDPB.

Objectives: The aims of this study were to investigate the antibacterial activity of an adhesive resin incorporating the antibacterial monomer 12-methacryloyloxydodecylpyridinium bromide (MDPB) as well as its bonding characteristics in terms of bond strength into dentin and curing ability.

Methods: An experimental adhesive resin was prepared by incorporation of 2.5% MDPB into proprietary adhesive (LB Bond), and the inhibitory effect of cured specimen against the growth of Streptococcus mutans on its surface was determined.

Internal root resorption associated with inadequate caries removal and orthodontic therapy.

This case report presents a case of internal root resorption originating from inadequate caries removal and orthodontic therapy in maxillary right lateral incisor in a 13-yr-old female. A preoperative, panoramic radiograph taken at the orthodontic office showed no evidence of resorption, however, the composite restoration in the coronal portion was inadequate. During 4 months of nickel titanium orthodontic wire activation, the patient suffered spontaneous pain.

Short-term evaluation of intentional replantation of vertically fractured roots reconstructed with dentin-bonded resin.

The purpose of this study was to evaluate intentional replantation of vertically fractured roots reconstructed with dentin-bonded resin. Twenty vertically fractured teeth were extracted intentionally and reconstructed with 4-META/MMA-TBB dentin-bonded resin. After reconstruction, the teeth were replanted into the original sockets.