Paul E. Kerber

A revision of the Hixon and Oldfather mixed-dentition prediction method

A revision of the Hixon and Oldfather prediction method was undertaken with measurements obtained from persons who participated in the Iowa Facial Growth Study, the same group of subjects used originally by Hixon and Oldfather to develop their prediction equation. A significantly improved prediction equation was developed. A graph was made for clinical use in the prediction of mandibular canine and premolar widths in mixed-dentition patients.

A clinical evaluation of techniques to determine the combined width of the maxillary anterior teeth and the maxillary central incisor

Abstract In this study, techniques to determine the combined width of the maxillary anterior teeth and the maxillary central incisor widths were evaluated. Measurements were obtained from the dental casts of 45 men and 45 women and related to their intercommissural width, interalar width, bizygomatic width, sagittal cranial diameter, interbuccal frenum distance, philtrum width, and age. Correlation coefficients were calculated for all relationships.

Bond strength of cements to crown bases

Amalgam crown bases provided more bond strength to cements than composite resin and cast gold. Modified zinc oxide-eugenol and polycarboxylate cements served better with composite resin bases. Modified zinc oxide-eugenol cement bonded to cast gold better than polycarboxylate and zinc phosphate cements. Polycarboxylate cement bonded to amalgam better than modified zinc oxide-eugenol and zinc phosphate cements. Amalgam was the material of choice for a crown base.

Staining calcified dental tissues with food.

The discoloration of enamel caused by food substances was found to be superficial and for dentin and cementum ingressive. Discoloration of cementum exceeded that of dentin, and dentin stained more than enamel. Coffee and soy sauce stained the calcified dental tissues more than the cola beverage and tea. The longer the staining time, the deeper was the discoloration.

Marginal leakage: Entry side and exit side-clinical implications

The marginal leakage along the proximal walls of Class II amalgam restorations was studied. The influence of the direction of the bur rotation to tooth structure in cavity preparation was the primary concern of investigation. Also, the effect of different cavity wall finishing techniques created by exit and entry action of the rotating bur and that of two different types of amalgam on the marginal leakage was studied. The degree of marginal leakage was not significantly different among any of the treatment groups.

Evaluation of Fluoride Prophylaxis Pastes

The fluoride (F) uptake from two commercial prophylaxis pastes and a newly formulated prophylaxis paste was compared. The enamel fluoride uptake of 26 extracted sound human molars was measured using an acid etch biopsy method. The F uptakes in ppm (mean ± SEM) for the control prophy pastes (C), Zircate treatment paste (Z), an APF paste (Nupro, A), and a new experimental paste (N) were 1145 ± 65, 1245 ± 72, 1857 ± 296, and 1841 ± 321, respectively. The enamel biopsy depths in μm (mean ± S.D.) for the control, Zircate, APF pastes, and Newpaste were 6.64 ± 1.75, 7.4 ± 2.32, 6.55 ± 2.23, and 7.69 ± 1.80. The Newpaste appeared to give a significantly higher fluoride uptake than Zircate and control pastes, but was very similar to an APF paste.

Stress Reactions of Various Judging Groups to the Child Dental Patient

Dental personnel representing various levels of clinical experience and education in pedodontics were shown slides of potentially stressing situations within the field of pedodontics. Stress was identified through voice analysis by the Psychological Stress Evaluator (PSE-101)*. Clinical experience and education in pedodontics does not decrease either absolute or relative amounts of stress. Visual stimuli are capable of eliciting a stressful response. Trained raters can interpret voice prints with a satisfactory degree of inter-rater reliability. The PSF-101 is a valid indicator of stress.