Raymond J. Loiselle

Oral perception and proprioception: a review of the literature and its significance to prosthodontics.

Abstract This review of the literature reveals the discrete sensitivity that exists in the separate components of the masticatory system. It also demonstrates the necessity for total integration of each component of the masticatory system and signals the importance of preserving the natural teeth. This entire field of oral proprioception and the proprioceptive effect of prosthodontic replacement needs much additional research and study.

Marginal microleakage—an in vivo assessment

Bilaterally paired mandibular teeth scheduled for extraction were chosen for in vivo and in vitro studies of marginal leakage. Decided contrast in test results indicates that marginal microleakage should be determined in vivo. Animal and human tests both show that the removal of a tooth from its organism is decisive in studies of marginal leakage around dental restorations. It is suggested that more accurate functional marginal leakage determinations result from in vivo tests.

Microleakage around Silver Alloy Restorations in a Biological Model

Microleakage around dental restorations traditionally has been determined in an in vitro system. However, it has not been established that marginal penetration would not be affected by removal of the tooth from the organism, which would eliminate the pulpal hydrostatic pressure and the effect of plaque on the osmotic gradient across the dentin tubules. The in vivo marginal penetration therefore was studied in a biological model to evaluate the present technics for in vitro determination of marginal leakage. Golden Syrian hamsters of the same substrain, purchased from the same source,* were used in groups of 24. From the time of acquisition until they were killed, the hamsters were maintained on a commercial rationt and tap water ad libitum. At an age of about 4 weeks, the hamsters were anesthetized with a 5% solution of sodium pentobarbital, 35 to 40 mg/kg of body weight, given intraperitoneally. Class V cavity preparations in 191 molars were made in the palatal aspect by using a cord-driven dental engine, small dental burs, and hand instruments modified for miniature cavity preparations. Silver alloy restorative material, prepared as for clinical use, was placed in the molars without bases or cavity liners. Four weeks after placement of the restorations, the hamsters were anesthetized and the

Protoplasmic Extrusion of Pollen Grains—an Electron Microscope Study

Summary Protoplasmic extrusion has been described previously and has been shown to be at least partly influenced by the salivary contents. An electron microscope study is hereby presented. These results demonstrate an active participation of pollen components in this process.