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Biomedical subjects

R M Moodnik

Publications and source records attributed to R M Moodnik.

10 recordsLinked to original sources
PubMed1982

A comparison of the marginal leakage of retrograde techniques.

An investigation of the apical seal of the most popular retrograde techniques was attempted. Ninety extracted maxillary central incisors were instrumented and obturated, and various apical procedures were performed. The depth of penetration of 2 percent methylene blue dye was used to evaluate the apical seal. Retrograde amalgam, heat-sealed gutta-percha, and the apicoectomy control showed average depths of penetration of 3.1, 4.0, and 4.6 mm., respectively, while cold-burnished gutta-percha yielded an average depth of penetration of 1.5 mm. The apical seal produced by cold-burnished gutta-percha allows less than half the penetration of the best of the other techniques and gave the most consistent results.

Apicoectomy↗
PubMed1980

A comparison of the marginal adaptation of retrograde techniques: a scanning electron microscopic study.

An investigation of the most popular retrograde technique for their marginal adaptation to dentin was attempted. Forty extracted maxillary central incisors were instrumented and obturated, and various apical procedures were performed. The scanning electron microscope was used to record the results. Retrograde amalgam, heat-sealed gutta-percha, and the apicoectomy control showed average marginal defects from 22 micron to 104 micron, while cold-burnished gutta-percha exhibited an average defect of only 1.8 micron. The marginal defect produced by cold-burnished gutta-percha is less than one tenth as large as the best of the other techniques.

Apicoectomy↗