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PubMedDate not supplied

Clinical outcome and prosthodontic compensation of tilted interforaminal implants for mandibular overdentures.

PURPOSE: The aim of this study was to evaluate the sagittal inclination of interforaminal implants, the clinical implant outcome, and the necessary extent of prosthodontic compensation modalities for implant overdentures (IODs). MATERIALS AND METHODS: Lateral cephalometric radiographs of 62 patients, each with a mandibular IOD retained by 2 to 4 implants, were analyzed. The sagittal inclination of the longitudinal implant axis of the most anterior implant was analyzed relative to the mandibular and occlusal planes. The angle needed to compensate for the inclination of the mandibular implant to obtain Angle's class I for the prosthesis (the compensation angle) was measured and compared with respect to skeletal class. Peri-implant structures were measured using the Plaque Index and the Gingival Index. The compensation angle was correlated with the mandibular implant inclination, the degree of mandibular atrophy, and the anterior facial height. RESULTS: The most anterior mandibular implants showed a mean retroinclination of 74.3 +/- 9.3 degrees in relation to the mandibular plane; retroinclination was significantly more pronounced in skeletal class II than skeletal classes I and III (P < .05). The compensation angle (26.9 +/- 10.5 degrees) was more significant for skeletal class II than for skeletal classes I and III (P < .01). Sagittal mandibular implant inclination correlated significantly to the compensation angle (r = -0.46; P < .05), mandibular atrophy (r = 0.32; P < .05) and mandibular facial height (r = -0.45; P < .05). Implant survival rate and peri-implant parameters (bone loss, pocket-depth, Plaque and Gingival Indices) of the interforaminal implants were not shown to be influenced by implant retroinclination. Nine patients (2 skeletal class 1, 7 skeletal class II) reported phonetic problems with the IOD because of narrowing of the lingual space but described significant improvement after a median 4.7 months (range, 3 to 12 months). DISCUSSION AND CONCLUSION: Depending on skeletal class, prosthetic compensatory mechanisms will be operative in the presence of mandibular implant retroinclination for IOD. Knowledge of mandibular inclinations and the compensatory mechanisms may be an essential factor in successful prosthetic rehabilitation and may provide for a homogenous design of the bar construction and easier handling and may also reduce stress on the attachment mechanism.

Cephalometry↗
PubMedDate not supplied

In vitro release of elements from prosthodontic base metal alloys: effect of protein-containing biologic environments.

PURPOSE: This study aimed to investigate the release of nickel, copper, zinc, cadmium, magnesium, and lead from prosthodontic base metal alloys into protein-containing biologic solutions. MATERIALS AND METHODS: Dissolution experiments were conducted in either 3% Dulbecco's Modified Eagle Medium or 3% bovine serum albumin solutions for 7 weeks. RESULTS: The protein-containing dissolution solutions and dissolution time did not have a significant effect on release of elements from the alloys (Kruskal-Wallis, P > .05). CONCLUSIONS: The amount of the released elements was well below the dietary intake levels of these elements. This study is important given the widespread use of the base metal alloys and the continuing public concerns/questions regarding the health benefits/risks associated with these materials.

Animals↗
PubMed1991

Oral prosthodontic rehabilitation for traumatic sports injuries.

Sports injuries to the mouth and oral cavity may be treated with a variety of prosthetic treatment methods. These may include a temporary removable appliance, especially when adjacent teeth are unrestored and free of caries. Other traditional forms of prosthetic rehabilitation can range from conventional clasped removable partial dentures to traditional fixed prosthesis. The use of clip bar overdentures has demonstrated their clinical acceptability, especially for athletes involved in contact sports. The optimal treatment for patients suffering tooth loss, however, is the use of the osseointegrated implant. This concept, developed and refined by P.I. Branemark, permits successful replacement of single as well as multiple lost teeth. Criteria for patient selection must be evaluated carefully, especially for immediate fixture placement in sockets of avulsed teeth. Professional athletes in high-impact contact sports should receive a resilient prosthesis and protective appliance to use during the sport season, followed by a screw-retained nonremovable prosthesis to be used in the off season. Considering all forms of prosthodontic treatment available to patients with missing teeth, the use of osseointegrated implants currently appears to be the most biologically conservative approach. Retrospective studies document the effectiveness of the treatment of partially edentulous jaws, results similar or better than those reported for fully edentulous patients indicate the effectiveness of the Branemark method of osseointegration.

Athletic Injuries↗
PubMed1991

Aesthetic control in fixed prosthodontics.

Leaving the aesthetic results of fixed prosthodontic treatment to chance, or to the judgment of a technician without guidance, leads to many surprises and disappointments. This paper describes techniques for planning the aesthetic outcome in the dental surgery, conveying the specifications to the dental technician and controlling the various aesthetic elements during construction of the restoration.

Denture, Partial, Fixed↗
PubMed1990

[Adaptation of currently used resins in prosthodontics].

This study is intended to detail the relative level of adaptation (at the hiatus palatinus) of five (5) acrylic resins used in partial and complete prosthodontics (Formatray, Orthodontic, Triad, Lucitone, Ivocap). These five (5) resins have been treated to five (5) different methods of conservation (in water at different temperatures, to air and to cold) to discover which of these methods are most likely to conserve the accuracy of adaptation one looks for in a resin.

Acrylic Resins↗
PubMed1990

Changes over time in the clientele and restoration pattern in a dental school prosthodontic department.

The clientele and the production of single artificial crowns and fixed partial dentures in the Department of Prosthodontics were compared from 1964/68-1982/87. In the first period 65 per cent of the single crowns were made for women versus 55 per cent in the second. In the first period 69 per cent of the crowns were placed in the upper jaw as against 60 per cent in the second period. On average 1.6 crowns were made per female patient in the first period versus 1.4 per male patient. In the second period both sexes averaged 1.8 units. In both jaws the percentage of root-filled crowned teeth had increased in the second period to 60 per cent from 48 per cent in the upper jaw and 46 per cent in the lower jaw. In both sexes maxillary and mandibular teeth were crowned on average 13 years later in the second period than in the first. Sixty per cent of the fixed partial dentures were made for women in the first period versus 55 per cent in the second. In the first period 74 per cent of the bridges were made for the upper jaw as against 70 per cent in the second period. The mean pontic to abutment ratio was 0.7 in both periods. The maximum number of bridges in the first period were made for patients 40-59 years of age versus 50-69 years in the second period.(ABSTRACT TRUNCATED AT 250 WORDS)

Age Factors↗
PubMed1990

[SEM study of failures in acid etched cast prosthodontics].

Eight bonded prosthodontic units (mean wearing time 14 months), with 7 retainers spontaneously debonded during clinical use and 9 retainers removed by the dentist, have been studied by SEM. Since only bond fractures at the acrylic/metal interface and mixed fractures could be detected, it may be concluded that late failure is governed by processes at the interface between metal and acrylic. The lost retainers showed overgrowth of mainly rod-shaped bacteria, although one of the artificially removed retainers that was clinically stable beforehand, also exhibited bacterial overgrowth. This suggests that sequential debonding is possible; hence bonded retainers impart a longterm caries risk to abutment teeth.

Acrylic Resins↗
PubMed1989

Japanese consonants compared with English with regard to prosthodontic dentistry.

This is the introductory paper of the forthcoming series of papers on Japanese consonants compared with English, presented as a basic study for prosthodontic dentistry. Materials for our experiment are fifteen groups of Japanese and English words and phrases to be uttered by normal native speakers of Japanese and English respectively. They are speakers of a modified standard Japanese and the Hichiku (: part of northern Kyushu) accent of Japanese and those of standard British English, General American English and Eastern American English. Each of the fifteen groups of words and phrases contains a set of Japanese and English consonants to be examined and compared with each other. The phonetic apparatus to be used are the sound spectrograph, oscillograph, phono-laryngograph, flow-nasalitygraph, electro-palatograph, etc.

Dentures↗
PubMed1989

Prosthodontic treatment.

Prosthodontic management of patients with implants of any kind will logically begin from the time at which the patient first presents for examination. It is essential that the patient be managed by an effective team. The restorative dentist, responsible for the ultimate restoration of the patient, should be a leading member of the implant team. The prosthodontist assumes ultimate responsibility for determination of fixture number and location based on prosthetic and functional needs. By carefully evaluating conditions with the other team members, the limitations and potential for fixture placement will be realized and consensus regarding treatment objectives will be achieved. This paper provides an overview of the restorative dentist's role in general patient assessment, in surgical and restorative treatment planning, and in the various stages of treatment from surgical placement through a range of definitive reconstructive procedures.

Dental Implantation, Endosseous↗
PubMed1989

[Study on the horizontal reference plane in prosthodontics. Establishment of the anterior reference point].

This study was made to obtain the anterior reference point for determining the horizontal reference plane in prosthodontics for transferring the model in the natural head position of each patient onto the articulator in dental clinics. The results thus obtained are as follows: 1. Measuring points in the sitting and standing postures were located below the orbital point, respectively. 2. The natural head position tended to shift upward significantly more frequently in the standing posture than in the sitting posture. 3. The natural head position in the standing posture varied less and was more restorable than in the sitting posture. 4. The natural head position in the mirror-viewing method varied less and was more restorable than in two other methods. 5. Between the three reference points in the natural head position, the measurements based on the orbital point and the inner canthus of the eye showed less variance than the measurements based on the ala of the nose. 6. The ratios calculated from the measurements based on the reference points in the natural head position showed slightly more variance than the measurements based on the reference points. 7. From the above, it can be said that the point 23.3mm below the inner canthus of the eye, which was the average of measurements taken with the mirror-viewing method in the standing posture, may be appropriate for use as the anterior reference point for transferring the model in the natural head position of each patient onto the articulator.

Cephalometry↗
PubMedDate not supplied

[Anthropometric planes of head and their application in prosthodontics].

The authors discuss the term, significance and application of certain anthropometric planes commonly used in prosthodontics. The angular and linear relations of the most frequently used planes, obtained on the basis of lateral cephalogram, are presented. Some problems that arise with the use of certain planes of reference when setting the cast in the articulator are also mentioned, and two methods for error compensation, when applying the axis-orbital plane, are suggested. It is also pointed out that there are misunderstanding and confusion in literature, with which the reader is confronted, which originate either in the use of different anthropometric planes or are due to non-citing of the plane used in a certain investigation.

Cephalometry↗
PubMed1989

[Augmentation of severely atrophied jaws with hydroxyapatite from a prosthodontics standpoint].

After 4 years of routine application of hydroxylapatite ridge augmentation 109 patients underwent a posttreatment examination. The quality of the alveolar ridge and the denture as well as the functional status of the craniomandibular system were evaluated in detail. For the maxilla good results were obtained in 80-90%, for the mandible in 70-80%. Further improvements seem more probable by the avoidance of prosthodontic faults and the elimination of functional disturbances than by additional surgical procedures such as vestibuloplasty.

Alveolar Ridge Augmentation↗
PubMed1989

Prosthodontic management of maxillofacial defects after cancer surgery.

Surgery for maxillofacial cancer often creates a defect, which may affect speech, swallowing, mastication and facial appearance. The provision of a prosthesis is one method to help restore these physiologic and psychologic functions. Prosthodontic planning and rehabilitation should be an integral part of the team management to provide not just the preservation, but a quality of life for the patient. Various types of appliances are illustrated and the role of the dental surgeon is emphasised.

Aged↗
PubMed1989

[Development of the dental arch and the palate from a prosthodontic point of view].

The replacement of missing teeth by a fixed restoration in the juvenile dentition presents various problems. One of them is that the growth and development of the entire masticatory organ continues until around the 18th year of age. It was the goal of a longitudinal study to find out when a fixed tooth replacement can be used in an adolescent without impairing the final development of the jaw bones. For this reason the transverse and sagittal dimensions of the dental arches of male adolescents aged 14 to 18 years were measured every year, and the palatal surfaces were measured in the first and last year of the study. The values determined for the dental arches remained constant. The mean values and deviations revealed no significant differences. From a prosthodontic point of view the development of the dental arches and the palate may be considered as concluded.

Adolescent↗
PubMed1989

The need for integrating TMJ therapy with implant prosthodontic cases.

In this paper, guidelines for TMJ diagnosis and treatment were reviewed, and a case history was presented demonstrating the need for the integration of TMJ therapy. The case history presented is just one of many cases in the author's practice where the implant candidate also presented with a CM-TMJ disorder. The author emphasizes the incorporation of a CM-TMJ disorder screening exam and history to complement the initial consultation by all practitioners. This should include: 1) check for pops, clicks, in front of ears, (opening, closing, protruding); 2) range of motion (three fingers opening); 3) headaches; 4) grind or brux (night or day); 5) palpate key masticatory muscles of the head and neck; 6) tooth interferences; and 7) bite feels off. The author understands that not all practitioners have access to various diagnostic instrumentation, but emphasizes that this should not prevent the practitioner from diagnosing and treating CM-TMJ disorders or referring for such treatment. The literature has not indicated the overall benefits of implant prosthodontics other than allowing mastication of food and a feeling of self-esteem; but the benefits also allow the treatment and relief of CM-TMJ disorders via a stable occlusion.

Dental Implantation↗
PubMed1989

Integral implant-prosthodontic considerations.

Components of the Integral implant system, prosthodontic methods, and uses for the implant system have been described. The system is most effective in the restoration of edentulous areas of the maxillary and mandibular arches.

Dental Abutments↗
PubMed1989

[Special considerations in the prosthodontic treatment of the elderly].

A particular problem in the prosthodontic treatment of aged persons is their diminished ability to adapt to changes. Consequently, this requires an incremental treatment plan for changes in the mouth. In many cases it is preferable to modify an existing denture step by step instead of constructing a new one. Where extractions are necessary, immediate replacements should be provided, if this aids the patient stereognostically. The extraction of all remaining teeth should be done in a prolonged step-by-step procedure and with the use of an extendible denture. Continued care is imperative. Important factors to be considered are denture maintenance, esthetics and the multimorbidity of the geriatric patient.

Aged↗