Biomedical subjects

J P Pontier

Publications and source records attributed to J P Pontier.

3 recordsLinked to original sources

PubMed1998

Facial changes in extraction and nonextraction patients.

The purpose of this study was to determine if there are any differences in the posttreatment faces of patients treated nonextraction and those treated with premolar extraction in properly diagnosed and treated cases. The study was conducted in two parts. In Part 1, perceptions of 192 experienced general dentists and orthodontists were tested. Facial photos of 25 consecutively treated nonextraction patients and 25 consecutively treated four-premolar-extraction patients were shown to the study participants. They were asked if the patient was treated with the extraction of four premolars or without extractions. The mean score of the respondents was 54%, only slightly better than pure chance. In Part 2, profiles were evaluated based on cephalometric tracings. There was no significant difference between pretreatment and posttreatment profiles of the groups. The mean H-line values for both groups were within the desired esthetic range. It was concluded that experienced orthodontists and general dentists could not determine whether treatment was nonextraction or extraction by looking at the face alone. Also, there was no significant difference between the faces produced by the two types of treatments. Therefore, the avoidance of extracting premolars based on a fear of a significant detrimental effect on the face is unjustified when the case has been properly diagnosed and treated.

Adolescent↗

PubMed1994

The effect of carbamide peroxide bleach on the tensile bond strength of ceramic brackets: an in vitro study.

Recent advances in cosmetic dentistry have led to the development of a variety of new products and techniques including vital bleaching and ceramic brackets. Therefore this study was conducted to see whether the use of an at-home carbamide peroxide bleaching agent before bonding affected the tensile bond strength of a precoated ceramic orthodontic bracket. Sixty extracted human premolar teeth were randomly separated into three groups of 20. Group 1 was a control group that was etched and bonded in the usual manner. Group 2 was immersed in a carbamide peroxide home bleaching agent for 72 hours before pumicing and bonding. Group 3 was also bleached for 72 hours but was immersed in distilled water for 1 week before bonding. The results indicated that recently bleached teeth have significantly reduced bond strength values when compared with both groups 1 and 3. We suggest that if a patient is using a tooth whitening product, that they discontinue its use at least 1 week before the bonding of orthodontic attachments.

Acid Etching, Dental↗

PubMedDate not supplied

Efficacy of a prebrushing rinse for orthodontic patients.

The oral health benefits of a prebrushing rinse, when used in conjunction with an established twice-a-day brushing regimen, was investigated in a population of orthodontic patients. Twenty children (ages 11-18) who were undergoing orthodontic treatment that required brackets and labial wires were enrolled. This randomized, double-blind, cross-over clinical trial compared five weeks of twice-daily use of a commercial prebrushing rinse (Plax) to five weeks of a placebo rinse. Three investigators rated plaque accumulation (Simplified Oral Hygiene Index) and gingival health (modified O'Leary Index) prior to treatment and after each five week session. Because one child exited from the project and three children did not satisfactorily comply with the treatment protocol, sixteen children were used for the analysis. Although both treatment groups showed plaque and gingival improvement from pretreatment scores, no differences in plaque accumulation ratings and gingival health ratings were noted between the active and placebo rinse treatments.

Adolescent↗